Thursday, August 19, 2021

   

These electric submarines map the seafloor to make way for wind power

PUBLISHED THU, AUG 19 2021
Lora Kolodny@LORAKOLODNY


KEY POINTS


A start-up called Bedrock has developed electric, autonomous submarines and software that map the seafloor to help identify sites that are suited for offshore wind farms.

The U.S. has been a global laggard in offshore wind power, with just one active facility that started commercial operations in 2016.

However, the Biden administration is pushing for a massive increase in U.S. offshore wind capacity by 2030.


Bedrock cofounders (L-R) CTO Charlie Chiau and CEO Anthony DiMare
Courtesy: Bedrock

In March, the departments of Energy, Interior and Commerce said they were aiming for U.S. offshore wind capacity to hit 30 gigawatts (GW) by 2030, a hugely optimistic goal that would require thousands of new wind turbines to be installed off the Atlantic, Pacific and Gulf coasts.

With federal support locked in, now it’s up to developers and operators to figure out where it’s safe to install offshore wind farms and pursue permits.

Bedrock, a Richmond, California, start-up, wants to help them map the seafloor using electric autonomous underwater vehicles (e-AUV) that can launch right from the shore.

Traditionally, marine surveys would require a large, crewed ship and heavy sonar equipment that would generate terabytes of data stored on hard drives that had to be mailed somewhere for processing and analysis.

Marine surveys like that can cost hundreds of thousands of dollars and take up to a full year, says Bedrock co-founder and CEO Anthony DiMare.

By contrast his company’s electric mini sub gathers data using lighter-weight sonar and other sensors, then transmits it to Bedrock’s cloud-based service. The company’s Mosaic software makes it usable almost right away from a work PC.

Bedrock’s electric submarines run on a lithium-ion battery that can be swapped out for a freshly charged one when needed. They run for 12- or 24-hour missions, typically at a speed of 2 to 3 knots (or less than 5 mph) to conduct surveys up to 300 meters in depth.


Bedrock was co-founded in 2019 by DiMare, a repeat entrepreneur and mechanical engineer, along with CTO Charlie Chiau, a former SpaceX systems integration engineer.

They told CNBC the company is focused on the needs of the domestic offshore wind industry right now, further motivated by the urgency of the IPCC report earlier this month.

However, Bedrock’s seafloor mapping technology can be put to use in many other industries. For example, it can find aging oil and gas infrastructure that may need to be decommissioned. It can also be used for data center planning underwater.

Bedrock developed an electric, autonomous underwater vehicle and software to map the seafloor.
Courtesy: Bedrock


To test the AUVs before they’re taken to the open water, Chiau says Bedrock has installed a 20-foot long, 5-foot deep circular tank in its Richmond office. This functions like an underwater treadmill, mimicking currents and conditions an electric submarine would likely encounter in an ocean or perhaps the Great Lakes.

The company has just one electric submarine operating commercially at this time, but the founders intend to build and send fleets of them into the water.

In March, Bedrock closed an $8 million seed round of funding, which it plans to use for hiring, refinements and production of more of its electric submarines, as well as cloud services and software development.

DiMare said the first 50 gigabytes of seafloor data will always be free for any user of the company’s Mosaic software to store and access. It was important to the co-founders that they give independent researchers and smaller teams access to the same kind of tools large renewable energy developers might have.


Bedrock’s Mosaic software shows a rendering of the seafloor.
Courtesy: Bedrock

Near term, Bedrock expects to make money by selling seafloor mapping and software as a service. It will send electric AUVs to scan a specific “polygon” -- essentially a plot of land on the seafloor -- collect data, clean it up and hand it over to customers via Mosaic.

To ensure that employees at Bedrock have a personal connection to the ocean, and a strong commitment to protecting marine ecosystems, the start-up gives new hires what DiMare and Chiau call an “ocean allowance.” This perk can go toward any activity, like scuba diving lessons, surfboard rentals or a guided kayaking tour.

The company is aiming to double its head count from around 25 employees today to 50 in the next year, and to help the U.S. catch up to European nations, and eventually China, when it comes to offshore wind capacity.

The U.S. has been a global laggard with just one active offshore wind facility that started commercial operations in 2016 -- the 30 MW Block Island Wind Farm.

Bedrock modernizes seafloor mapping with autonomous sub and cloud-based data

Devin Coldewey@techcrunch •August 19, 2021

Image Credits: Bedrock


The push for renewable energy has brought offshore wind power to the forefront of many an energy company’s agenda, and that means taking a very close look at the ocean floor where the installations are to go. Fortunately Bedrock is here to drag that mapping process into the 21st century with its autonomous underwater vehicle and modern cloud-based data service.

The company aims to replace the standard “big ship with a big sonar” approach with a faster, smarter, more modern service, letting companies spin up regular super-accurate seafloor imagery as easily as they might spin up a few servers to host their website.

“We believe we’re the first cloud-native platform for seafloor data,” said Anthony DiMare, CEO and co-founder (with CTO Charlie Chiau) of Bedrock. “This is a big data problem — how would you design the systems to support that solution? We make it a modern data service, instead of like a huge marine operation — you’re not tied to this massive piece of infrastructure floating in the water. Everything from the way we move sonars around the ocean to the way we deliver the data to engineers has been rethought.”

The product Bedrock provides customers is high-resolution maps of the seafloor, made available via Mosaic, a familiar web service that does all the analysis and hosting for you — a big step forward for an industry where “data migration” still means “shipping a box of hard drives.”

Normally, DiMare explained, this data was collected, processed and stored on the ships themselves. Since they were designed to do everything from harbor inspections to deep sea surveys, they couldn’t count on having a decent internet connection, and the data is useless in its raw form. Like any other bulky data, it needs to be visualized and put in context.



Image Credits: Bedrock

“These data sets are extremely large, tens of terabytes in size,” said DiMare. “Typical cloud systems aren’t the best way to manage 20,000 sonar files.”

The current market is more focused on detailed, near-shore data than the deep sea, since there’s a crush to take part in the growing wind energy market. This means that data is collected much closer to ordinary internet infrastructure and can be handed off for cloud-based processing and storage more easily than before. That in turn means the data can be processed and provided faster, just in time for demand to take off.

As DiMare explained, while there may have been a seafloor survey done in the last couple decades of a potential installation site, that’s only the first step. An initial mapping pass might have to be made to confirm the years-old maps and add detail, then another for permitting, for environmental assessments, engineering, construction and regular inspections. If this could be done with a turnkey automated process that produced even better results than crewed ships for less money, it’s a huge win for customers relying on old methods. And if the industry grows as expected to require more active monitoring of the seafloor along every U.S. coast, it’s a win for Bedrock as well, naturally.




Image Credits: Bedrock


To make this all happen, of course, you need a craft that can collect the data in the first place. “The AUV is a piece of technology we built solely to enable a data product,” said DiMare, but noted that, originally, “we didn’t want to do this.”

“We started to spec out what it looked like to use an off the shelf system,” he explained. “But if you want to build a hyper-scalable, very efficient system to get the best cost per square meter, you need a very specific set of features, certain sonars, the compute stack… by the time we listed all those we basically had a self-designed system. It’s faster, it’s more operationally flexible, you get better data quality, and you can do it more reliably.”

And amazingly, it doesn’t even need a boat — you can grab it from the back of a van and launch it from a pier or beach.

“From the very beginning one of the restrictions we put on ourselves was ‘no boats.’ And we need to be able to fly with this thing. That totally changed our approach,” said DiMare.




Image Credits: Bedrock

The AUV packs a lot into a small package, and while the sensor loadout is variable depending on the job, one aspect that defines the craft is its high-frequency sonar.

Sonars operate in a wide range of frequencies, from the hundreds to the hundreds of thousands of hertz. Unfortunately that means that ocean-dwelling creatures, many of which can hear in that range, are inundated with background noise, sometimes to the point where it’s harmful or deters them from entering an area. Sonar operating about 200 kHz is safe for animals, but the high frequency means the signal attenuates more quickly, reducing the range to 50-75 meters.

That’s obviously worthless for a ship floating on the surface — much of what it needs to map is more than 75 meters deep. But if you could make a craft that always stayed within 50 meters of the seabed, it’s full of benefits. And that’s exactly what Bedrock’s AUV is designed to do.

The increased frequency of the sonar also means increased detail, so the picture its instruments paint is better than what you’d get with a larger wave. And because it’s safe to use around animals, you can skip the (very necessary but time-consuming) red tape at wildlife authorities. Better, faster, cheaper and safer is a hell of a pitch.

Today marks the official launch of Mosaic, and to promote adoption Bedrock is offering 50 gigs of free storage — of any kind of compatible map data, since the platform is format-agnostic.

There’s a ton of data out there that’s technically “public” but is nevertheless very difficult to find and use. It may be a low-detail survey from two decades ago, or a hyper-specific scan of an area investigated by a research group, but if it were all in one place it would probably be a lot more useful, DiMare said.

“Ultimately we want to get where we can do the whole ocean on a yearly basis,” he concluded. “So we’ve got a lot of work to do.”

 

  

Super Clean Water from Cooling Towers and Grid-Scale Battery Storage Doubles as Frequency Control
Aug 19, 2021

engineeringdotcom

Electrostatics have long been a high-efficiency technology for removing pollutants from the air, from residential air cleaners to the electrostatic precipitators in coal-fired power plants. A new use for this technology has been developed by an MIT spinoff that promises to capture water vapour emitted by industrial and commercial cooling towers. Captured water is pure enough to be practical for human consumption or as boiler feed water for generating plants.


Battery storage of electrical power is an essential part of intermittent clean energy systems like photovoltaic panels and wind turbines. But batteries can have a secondary and equally important purpose: grid forming. Frequency control of large AC grids can be difficult with multiple generating sources and varying loads across a system. With advanced computer control of inverters, battery storage systems can act as a frequency regulator in large grid systems, forming an electrical equivalent of the large rotating inertial mass of a mechanical generator. Technology makes battery storage for grid purposes both more useful and cost-effective. 
SPACE WARS BEZOS VS MUSK
NASA agrees to pause SpaceX lunar contract until November after Jeff Bezos’ Blue Origin files suit



BY TODD BISHOP on August 19, 2021
An artist’s rendering shows SpaceX’s Starship rocket ship on the moon. (SpaceX Illustration)

NASA paused its contract with SpaceX to take astronauts back to the moon pending the initial outcome of a lawsuit filed by Blue Origin.

The voluntary stay will expire on Nov. 1, two weeks after oral arguments are set to take place in the case, according to a timeline laid out Thursday in the U.S. Court of Federal Claims.

Blue Origin, Amazon founder Jeff Bezos’ commercial space venture, filed the complaint against the U.S. government over NASA’s decision to award a $2.9 billion contract to Elon Musk’s SpaceX to build what would be the first lunar lander to carry astronauts to the moon since the Apollo era.

The decision was previously the subject of a Blue Origin protest, which was denied by the Government Accountability Office on July 30.

Blue Origin filed its lawsuit under seal, but the company’s previous bid protest disputed NASA’s decision to award a single contract.

NASA originally had hoped to fund two of the three teams to continue work on their human landing systems, which would have provided a backup option. Agency officials cited congressional budget limits as one reason for making only one award.

Todd Bishop is GeekWire's co-founder, a longtime business and technology journalist who covers topics including Amazon, Microsoft, startups, AI, the cloud and health tech, and hosts GeekWire's weekly podcast. Follow him @toddbishop. Email todd@geekwire.com.

Blue Origin leaving humans behind as next mission will carry scientific and research payloads


BY KURT SCHLOSSER on August 18, 2021
(Blue Origin Photo)

Jeff Bezos and his crewmates won’t be hopping aboard for a suborbital redo on the next New Shepard mission. The Amazon founder’s space venture announced Wednesday that the 17th flight of the reusable rocket ship will carry scientific and research payloads.

Blue Origin scheduled the launch for 6:35 a.m. PT on Aug. 25 from its West Texas facility. It’s the fourth flight for the program in 2021 and the eighth for this particular vehicle.

The NS-17 mission will carry NASA lunar landing technologies being tested to help reduce risk and increase confidence for successful missions to the moon. The payload, which flew in a previous experiment on Oct. 13, 2020, is mounted to the exterior of the rocket booster. According to Blue Origin, information from the first flight informed improvements to technology that determines a spacecraft’s location and speed as it approaches the surface of the moon.

Blue Origin’s continued interest and work on future moon missions comes in the wake of the company’s recent legal action against the U.S. government. Blue Origin is suing NASA over its decision to award a $2.9 billion contract to Elon Musk’s SpaceX to build what would be the first lunar lander to carry astronauts to the moon since the Apollo era.


NS-17 will also carry 18 commercial payloads inside the crew capsule, 11 of which are NASA supported.

The rocket will also have another unique payload on the exterior — an art installation called “Suborbital Tryptych,” a series of three portraits by Ghanaian artist Amoako Boafo painted on the top of the crew capsule on the main chute covers. “The portraits capture the artist, his mother, and a friend’s mother … and is part of Uplift Aerospace’s Uplift Art Program, whose purpose is to inspire new ideas and generate dialog by making space accessible and connected to the human experience,” Blue Origin said.

Bezos and three crewmates took a 10-minute ride as the first humans aboard a New Shepard ship on July 20.

Writer and editor Kurt Schlosser covers the Geek Life beat for GeekWire. A longtime journalist, photographer and designer, he has worked previously for NBC News, msnbc.com and the Seattle P-I. Follow Kurt on Twitter or reach him at kurt@geekwire.com.


How Big Can the Quantum World Be? Physicists Probe the Limits.

By showing that even large objects can exhibit bizarre quantum behaviors, physicists hope to illuminate the mystery of quantum collapse, identify the quantum nature of gravity, and perhaps even make Schrödinger’s cat a reality.




How large can an object be and still act like a quantum wave? In theory, any size at all.


Hannes Hummel for Quanta Magazine
Philip Ball
Contributing Writer


August 18, 2021
VIEW PDF/PRINT MODE




It’s a mere speck of matter — a piece of silica crystal no bigger than a virus, levitated in a light beam. But it is almost as motionless as the laws of physics permit.

Two teams of researchers, in Austria and Switzerland, have independently succeeded in freezing such minuscule nanoparticles, just 100 to 140 nanometers across, almost entirely into their lowest-energy quantum state, giving them effectively a temperature just a few millionths of a degree above absolute zero — and fixing them in place with unearthly precision.

Holding a nanoparticle this tightly in a single spot is just the start. The goal is to put these objects into a so-called quantum superposition — where it becomes impossible to say, before measuring them, just where they are. A particle in a superposition could be found in one of two or more places, and you just don’t know which of them it will be until you look. It is perhaps the most startling example of how quantum mechanics seems to insist that our familiar world of objects with definite properties and positions comes into being only through the act of looking at it.

Superpositions of subatomic particles, atoms, and the massless “particles” of light called photons are well established. But because such quantum effects tend to be very easily disturbed when the particles interact with their surroundings, setting up superpositions gets rapidly harder as the objects get bigger and experience more interactions. Those interactions tend to almost instantaneously destroy a superposition and leave the object with unique, well-defined properties.

All the same, researchers have been steadily increasing the size at which superpositions and related quantum effects can still be observed — from particles to small molecules, then bigger molecules, and now, they hope, nanoscale lumps of matter. No one knows how far in principle this expansion of quantumness can continue. Is there — as some think — a size limit at which it simply vanishes, perhaps because quantum behavior is incompatible with gravity (which is negligible for atoms and molecules)? Or is there no fundamental limit to how big quantumness can be?


A silica nanoparticle has been cooled to its quantum ground state.
Lorenzo Magrini, Yuriy Coroli/University of Vienna



These questions have been around throughout the century-long history of quantum theory. Now, for the first time, researchers are on the cusp of being able to answer them — and perhaps to point the way toward describing how gravity fits into the quantum world. “I’ve been working on macroscopic superpositions for 10 years,” said the quantum theorist Oriol Romero-Isart of the University of Innsbruck in Austria, one of the leaders in the field, “but now we’re at a very timely moment.” In the coming years, we might discover whether or not the world is quantum all the way up.





Aquantum particle in a superposition, contrary to common belief, is not really in two (or more) states at once. Rather, a superposition means that there is more than one possible outcome of a measurement. For an object at everyday scales, described by classical physics, that makes no sense — it is either here or there, red or blue. If we can’t say which it is, that’s just because of our ignorance: We haven’t looked. But for quantum superpositions, there simply is no definite answer — the property of “position” is ill-defined.

If, however, we only see one outcome or the other when we look, how can we know the particle was in a superposition before we looked? The answer is that so long as we don’t try to find out what the outcome is — so long as we don’t measure that property — the two (or more) alternatives somehow embodied in the superposition can interfere with one another, just like two waves. This wavy behavior is embodied in a mathematical entity called the wave function, which encodes everything we are able to say about the particle.

Quantum interference is most famously seen when a particle passes through two narrowly spaced slits in a screen. If we don’t look to see which slit the particle goes through, then the particle will behave much like a water wave, and its wave function will spread through both slits at once, creating an interference pattern.

But if we place a measuring device by a slit to tell us if each particle went through it or not — to observe the particle’s path — then the interference pattern goes away.

How big can objects get and still behave as interfering “matter waves”? The quantum physicist Anton Zeilinger and his co-workers at the University of Vienna studied that question in 1999 with a double-slit experiment using carbon molecules called fullerenes (C60), made from exactly 60 carbon atoms linked into hexagonal and pentagonal rings like the leather patches of a soccer ball. They found a clear interference pattern, demonstrating that even molecules like C60 — at 0.7 nanometers across, much bigger and heftier than an individual atom — could be put into a superposition.

Perhaps just as important, they went on to study how that superposition went away.

Interactions between a quantum particle and neighboring particles, such as gas molecules or photons, entangle both objects into a kind of joint quantum state. In this way, a superposition of the original particle gets spread into the environment.

Rather like an ink droplet diffusing and spreading in a glass of water, this spreading superposition makes it ever harder to see the original one unless you look at every spot it has spread to and reconstruct it from that information. As entanglement mixes the wave function of the initial superposed particle with those of its surrounding particles, the wave function seems to lose coherence and become just a mass of incoherent little waves. This process is called decoherence, and it makes the superposition undetectable in the original object: Its quantum nature seems to disappear.





The high-vacuum chamber of the interferometer in Markus Arndt’s laboratory includes a violet mirror and nanomotors to move the mechanical gratings.


Quantum Nanophysics Group

Decoherence of a quantum superposition happens extremely fast unless the interactions of the particle with its environment can be minimized — for example, by cooling it to extremely low temperatures to reduce the disruptive effect of heat, and keeping the object in a vacuum to eliminate molecular collisions. The bigger the object is, the more interactions it is likely to have, and the faster decoherence happens. For a dust grain about 10 micrometers across floating in the air, a superposition state of two positions in space separated by about the same width as the grain itself is estimated to decohere in about 10−31 seconds — less than the time it takes for a beam of light to travel the width of a proton.

Decoherence seems to be the main obstacle to making quantum superpositions of large objects that last long enough to be observed. The interference experiments with fullerenes lent support to that picture. The Vienna team predicted that the interference of the particles should gradually disappear as they let a background gas into the chamber, where its molecules would collide with the fullerenes and destroy the coherence of their quantum waves. That’s exactly what they saw.

One of the members of Zeilinger’s team was Markus Arndt, who has continued the quest to scale up quantum interference over the past two decades. In 2011, he and his team interfered beams of carbon-based organic molecules with up to 430 atoms each, measuring up to 6 nanometers across. In 2019, they did it with molecules of around 2,000 atoms. Then last year, they created interference patterns in a biological molecule — specifically, a natural peptide called gramicidin A1 — even though these are fragile molecules to submit to the arduous conditions of molecular-beam interference experiments.

Arndt says his goal is to increase the mass of the particles by a factor of 10 every year or two. That would soon take them well into the size and mass range of biological objects such as viruses. Meanwhile, in 2009 Romero-Isart, then at the Max Planck Institute for Quantum Optics in Garching, Germany, and his co-workers sketched out an idea to levitate viruses in an optical trap — where tiny objects are held fast by the forces induced by intense, focused light beams — and then coax them into a superposition of two vibration states and look for interference between them.

Why stop there? The researchers even speculated about doing the same to unambiguously living organisms, such as the phenomenally robust little animals called tardigrades, which are about a millimeter wide and have been found to survive several days of exposure to outer space. The researchers wrote that the plan would allow them to create “quantum superposition states in very much the same spirit as the original Schrödinger’s cat” — the famous thought experiment intended to highlight the apparent absurdity of quantum superpositions for large (and especially living) entities.




The prospect of making Schrödinger’s absurdities into reality is one animating principle behind the Q-Xtreme project, a collaboration between the groups of Markus Aspelmeyer of the University of Vienna, Lukas Novotny and Romain Quidant at the Swiss Federal Institute of Technology Zurich, and Romero-Isart.

In 2019 three of the groups, in two independent studies, reported that they could cool down silica nanoparticles about 100 to 150 nanometers across, containing around a hundred million atoms, almost into their lowest-energy (ground) quantum state while holding them in an optical trap produced by laser beams.

Then last year, Aspelmeyer’s team reported that they had ushered such particles even more fully into the ground state, where the vibrations of the crystalline lattice of atoms are as minimal as they can be. At absolute zero, the particle would be entirely in the ground state, and the only motion remaining would be the so-called zero-point motion of the atoms. In Aspelmeyer’s experiment, the particle was in its ground state 70% of the time on average.

Now in their latest experiments, Aspelmeyer and Novotny have managed to get rid of the optical trap — which affects the quantum behavior of the free particle — so that they can observe the particle “in the wild,” as it were, rather than in captivity. The researchers use laser light to constantly measure the particle’s position, then apply an electric field to nudge the particle so that it stays in its designated location — not by trapping, but by gentle coaxing. This “active feedback” approach suppresses the particle’s thermal jiggling and cools it to an extremely low temperature.

Aspelmeyer’s group says that the spread in their particle’s position is only 1.3 times that of the zero-point motion, equivalent to a temperature of just a few millionths of a kelvin above absolute zero. Novotny and colleagues obtained comparable cooling with a similar setup.




Inside a vacuum chamber in the lab of Lukas Novotny (left), 
two optical lenses hold a levitated silica nanoparticle (right).
ETH Zurich


The next step will be to make a superposition. In order to do so, the researchers will need to control three key environmental influences. First, they must eliminate any noisiness in the active-feedback potential. Then they need to use a very high vacuum — about 10−11 millibars of pressure — so that there’s almost nothing for the particle to collide with. Finally, they need to stop the particle from radiating any photons — as any warm object does. Though the particle is very tightly localized, as if supercold, it absorbs enough of the photons buzzing around to be at an internal temperature of 1,000 degrees Kelvin or so, which would make it radiate like a hot poker. Suppressing the decoherence induced by that radiation is going to be tough, said Romero-Isart.

The need to suppress radiation from the particle speaks to a subtle yet critical issue. A quantum superposition isn’t destroyed because a disturbance from the environment comes in and knocks it off balance. Rather, it’s destroyed when information about the object’s location leaks out into the environment where it can be measured — just as interference in a quantum double-slit experiment is destroyed by measuring particle paths.

If a gas molecule bounces off it, say, in principle you could figure out where the particle is by looking at the molecule’s trajectory. Or if it radiates photons, you can see where it is just as you can locate your front door at night from the light on your porch. Yet in the case of your front door, the light only reveals its location. For quantum objects, the radiated light creates it.





This sensitivity of a superposition to interactions with the environment makes the experiment hard, but it can also be useful. For example, a system like this could be used to study how quantum objects lose their quantumness through decoherence and become classically fixed in one place. “Large superpositions are very fragile and sensitive to decoherence,” said Romero-Isart — but “decoherence is something we don’t understand completely.” So the experiments could test theories of how it happens.

Researchers are particularly keen to examine one idea about how quantum becomes classical. This switch has long been described as “collapse of the wave function”: A superposition of two possible states, say, collapses to just one of them when measured. This collapse was first proposed by the Hungarian mathematical physicist John von Neumann in the 1930s as an ad hoc way to get from the probabilities encoded in the wave function to the definite values that actual measurements produce. It was a sleight of hand with no real justification from the theory itself: a mathematical convenience to reconcile the theory with what we actually see.

Ideas about decoherence and interaction with the measuring apparatus have now largely replaced von Neumann’s mysterious notion of an abrupt collapse. But some researchers have proposed that collapse is nonetheless a real, physical process that produces classical definiteness from quantum possibilities. “Collapse models predict breakdowns of [standard] quantum mechanics when you have large masses and large superpositions,” said Romero-Isart. “Quantum mechanics has not been tested in that space.”




Kahan Dare (left) and Manuel Reisenbauer, researchers 
in the lab of Markus Aspelmeyer, work on the experiment to cool  levitated nanoparticle to its quantum ground state.Lorenzo Magrini, Yuriy Coroli/University of Vienna

He and his colleagues in Q-Xtreme hope to test physical-collapse models, which predict that large superpositions will be shorter-lived than expected. In particular, they hope to explore what happens to quantum mechanics at size scales where gravity matters.

Right now, quantum mechanics seems incompatible with the modern theory of gravity, namely Albert Einstein’s general relativity. The quantum world is discrete and granular, whereas relativity describes space-time as smooth and continuous. Usually this discord can be ignored, because quantum mechanics describes the very small while general relativity describes large, massive objects.

But the British mathematical physicist Roger Penrose has suggested that at intermediate scales, when quantum theory collides with general relativity, the latter will win, destroying quantum effects. Under general relativity, any object that has a significant gravitational field distorts space-time. But an object in a superposition of locations would then produce two superposed space-times: a situation that general relativity doesn’t allow. So Penrose believes that gravity would force a choice between the alternatives.

Aspelmeyer thinks that Q-Xtreme should finally be able to put theories like this one to the test. “At the scale of our planned experiment, all existing collapse models would either be ruled out or constrained to parameter regimes that render them meaningless,” he said.

Superpositions of masses large enough for gravity to come into play could probe quantum aspects of gravity itself. One idea for doing that is to use gravitational interaction to entangle the masses. In 2017, the physicists Sougato Bose of University College London and Vlatko Vedral and Chiara Marletto of the University of Oxford independently proposed experiments that might do just that. Such experiments are “super exciting but very hard,” said Romero-Isart — although Vedral thinks that it could be feasible in the next 10 years or so.

No one knows quite what to expect. “Once we can study a situation where quantum theory would suggest that space-time itself should be in a superposition of two measurably different states,” said Aephraim Steinberg, a quantum physicist at the University of Toronto, “all bets are off, and we have nothing but experiment to guide us. It’s reasonable to keep an open mind to the possibility that we will discover something new.”

Vedral expects we will find that gravity (at least when it is not super strong) can indeed be described using standard quantum field theory, just like the other known forces. But he admits that “secretly I’m hoping that it would fail, because as a theoretician you would like something extraordinary to happen.”





Attempting large quantum superpositions is a win-win situation, said Bose. If we find that physical collapse prohibits them, that would be a huge discovery about the fundamental nature of quantum mechanics. But if, as many suspect, physical collapse doesn’t occur and the quantum world can just keep getting bigger, then big superpositions, with their extreme sensitivity to sources of decoherence, could act as very delicate sensors. The physicists Jess Riedel and Itay Yavin in Canada, for example, have proposed that quantum systems that are sensitive to gravitational effects might offer a way to look for dark matter particles, which seem to interact with ordinary matter only via gravity. Bose, meanwhile, is interested in using such systems as benchtop detectors of gravitational waves, which so far have only been seen with the aid of immense detectors several kilometers in size.

RELATED:

How Bell’s Theorem Proved ‘Spooky Action at a Distance’ Is Real

Quantum Mischief Rewrites the Laws of Cause and Effect

What Is a Particle?

In other words, expanding the quantum scale up to sizes where gravity matters might teach us new things about quantum mechanics, gravity and hidden aspects of the universe. The project will push technological capabilities to the limit, but the payoff could be enormous. And the current resurgence of interest in creating quantum phenomena such as superposition and entanglement on large scales is not a chance occurrence, said Arndt — because these are precisely what will be needed if we are going to scale up quantum computers so that they have many thousands or even millions of entangled quantum bits. “Quantum technologies will receive dozens of billions of dollars of investments in the coming years,” he said, “and we had better understand the foundations of the theory underlying all these technological hopes.”

Scientists discover crystal exhibiting exotic spiral magnetism

Scientists discover crystal exhibiting exotic spiral magnetism
This “semimetal” crystal consists of repeating unit cells such as the one to the left, which has a square top and rectangular sides. The spheres represent silicon (violet), aluminum (turquoise), and — in gold — neodymium (Nd) atoms, the last of which are magnetic. Understanding the special magnetic properties of the material requires nine of these unit cells, shown as the larger block to the right (which has a unit single cell outlined in red). This 3x3 block shows green “Weyl” electrons traveling diagonally across the top of the cells and affecting the magnetic spin orientation of the Nd atoms. A special property of the Weyl electron is the locking of its spin direction, which either points parallel or antiparallel to the direction of its motion, as represented by the small arrows in the Weyl electrons. As these electrons travel along the four gold Nd atoms, the Nd spins reorient themselves into a “spin spiral” which can be imagined as pointing successively in the 12 o’clock direction (closest to viewer with red arrow pointing upward), 4 o’clock (blue arrow), 8 o’clock (also in blue) and again 12 o’clock (farthest from viewer and again in red). Lines of Nd atoms stretch through many layers of the crystal, offering many instances of this unusual magnetic pattern. Credit: N. Hanacek/NIST

An exotic form of magnetism has been discovered and linked to an equally exotic type of electrons, according to scientists who analyzed a new crystal in which they appear at the National Institute of Standards and Technology (NIST). The magnetism is created and protected by the crystal's unique electronic structure, offering a mechanism that might be exploited for fast, robust information storage devices.

The newly invented material has an unusual structure that conducts electricity but makes the flowing electrons behave as massless particles, whose  is linked to the direction of their motion. In other materials, such Weyl electrons have elicited new behaviors related to electrical conductivity. In this case, however, the electrons promote the spontaneous formation of a magnetic spiral. 

"Our research shows a rare example of these particles driving collective magnetism," said Collin Broholm, a physicist at Johns Hopkins University who led the  at the NIST Center for Neutron Research (NCNR). "Our experiment illustrates a unique form of magnetism that can arise from Weyl electrons."

The findings, which appear in Nature Materials, reveal a complex relationship among the material, the electrons flowing through it as current and the magnetism the material exhibits. 

In a refrigerator magnet, we sometimes imagine each of its  as having a bar magnet piercing it with its "north" pole pointing in a certain direction. This image refers to the atoms' spin orientations, which line up in parallel. The material the team studied is different. It is a "semimetal" made of silicon and the metals aluminum and neodymium. Together these three elements form a crystal, which implies that its component atoms are arranged in a regular repeating pattern. However, it is a crystal that breaks inversion symmetry, meaning that the repeating pattern is different on one side of a crystal's unit cells—the smallest building block of a crystal lattice—than the other. This arrangement stabilizes the electrons flowing through the crystal, which in turn drive unusual behavior in its magnetism. 

The electrons' stability shows itself as a uniformity in the direction of their spins. In most materials that conduct electricity, such as , the electrons that flow through the wire have spins that point in random directions. Not so in the semimetal, whose broken symmetry transforms the flowing electrons into Weyl electrons whose spins are oriented either in the direction the electron travels or in the exact opposite direction. It is this locking of the Weyl electrons' spins to their direction of motion—their momentum—that causes the semimetal's rare magnetic behavior.

The material's three types of atoms all conduct electricity, providing steppingstones for electrons as they hop from atom to atom. However, only the neodymium (Nd) atoms exhibit magnetism. They are susceptible to the influence of the Weyl electrons, which push the Nd atom spins in a curious way. Look along any row of Nd atoms that stretches diagonally through the semimetal, and you will see what the research team refers to as a "spin spiral." 

"A simplified way to imagine it is the first Nd atom's spin points to 12 o'clock, then the next one to 4 o'clock, then the third to 8 o'clock," Broholm said. "Then the pattern repeats. This beautiful spin 'texture' is driven by the Weyl electrons as they visit neighboring Nd atoms."

It took a collaboration among many groups within the Institute for Quantum Matter at Johns Hopkins University to reveal the special magnetism arising in the crystal. It included groups working on crystal synthesis, sophisticated numerical calculations and neutron scattering experiments. 

"For the neutron scattering, we greatly benefited from the extensive amount of neutron diffraction beam time that was available to us at the NIST Center for Neutron Research," said Jonathan Gaudet, one of the paper's co-authors. "Without the beam time, we would have missed these beautiful new physics."

Each loop of the spin spiral is about 150 nanometers long, and the spirals only appear at  below 7 K. Broholm said that there are materials with similar physical properties that function at room temperature, and that they might be harnessed to create efficient magnetic memory devices.

"Magnetic memory technology like hard disks usually requires you to create a magnetic field for them to work," he said. "With this class of materials, you can store information without needing to apply or detect a magnetic field. Reading and writing the information electrically is faster and more robust." 

Understanding the effects that the Weyl electrons drive also might shed light on other materials that have brought consternation to physicists. 

"Fundamentally, we might be able to create a variety of materials that have different internal spin characteristics—and perhaps we already have," Broholm said. "As a community, we have created many magnetic structures we don't immediately comprehend. Having seen the special character of Weyl-mediated magnetism, we may finally be able to understand and use such exotic magnetic structures." New quantum material discovered

More information: Gaudet, J. et al. Weyl-mediated helical magnetism in NdAlSi. Nat. Mater. (2021). doi.org/10.1038/s41563-021-01062-8 , www.nature.com/articles/s41563-021-01062-8

Journal information: Nature Materials 

Provided by National Institute of Standards and Technology 

This exotic particle had an out-of-body experience; these scientists took a picture of it

This exotic particle had an out-of-body experience; these scientists took a picture of it
Schematic of the triangular spin lattice and star-of-David charge density wave pattern in a
 monolayer of tantalum diselenide. Each star consists of 13 tantalum atoms.
 Localized spins are represented by a blue arrow at the star center. The wavefunction
 of the localized electrons is represented by gray shading.
 Credit: Mike Crommie et al./Berkeley Lab

Scientists have taken the clearest picture yet of electronic particles that make up a mysterious magnetic state called quantum spin liquid (QSL).

The achievement could facilitate the development of superfast quantum computers and energy-efficient superconductors.

The scientists are the first to capture an image of how electrons in a QSL decompose into spin-like particles called spinons and charge-like particles called chargons.

"Other studies have seen various footprints of this phenomenon, but we have an actual picture of the state in which the spinon lives. This is something new," said study leader Mike Crommie, a senior faculty scientist at Lawrence Berkeley National Laboratory (Berkeley Lab) and physics professor at UC.

"Spinons are like ghost particles. They are like the Big Foot of quantum physics—people say that they've seen them, but it's hard to prove that they exist," said co-author Sung-Kwan Mo, a staff scientist at Berkeley Lab's Advanced Light Source. "With our method we've provided some of the best evidence to date."

A surprise catch from a quantum wave

In a QSL, spinons freely move about carrying heat and spin—but no electrical charge. To detect them, most researchers have relied on techniques that look for their heat signatures.

This exotic particle had an out-of-body experience; these scientists took a picture of it
Scanning tunneling microscopy image of a tantalum diselenide sample that is just 3 atoms
 thick. Credit: Mike Crommie et al./Berkeley Lab

Now, as reported in the journal Nature Physics, Crommie, Mo, and their research teams have demonstrated how to characterize spinons in QSLs by directly imaging how they are distributed in a material.

To begin the study, Mo's group at Berkeley Lab's Advanced Light Source (ALS) grew single-layer samples of tantalum diselenide (1T-TaSe2) that are only three-atoms thick. This material is part of a class of materials called transition metal dichalcogenides (TMDCs). The researchers in Mo's team are experts in , a technique for synthesizing atomically thin TMDC crystals from their constituent elements.

Mo's team then characterized the thin films through angle-resolved , a technique that uses X-rays generated at the ALS.

Using a microscopy technique called scanning tunneling microscopy (STM), researchers in the Crommie lab—including co-first authors Wei Ruan, a postdoctoral fellow at the time, and Yi Chen, then a UC Berkeley graduate student—injected electrons from a metal needle into the tantalum diselenide TMDC sample.

Images gathered by scanning tunneling spectroscopy (STS) – an imaging technique that measures how particles arrange themselves at a particular energy—revealed something quite unexpected: a layer of mysterious waves having wavelengths larger than one nanometer (1 billionth of a meter) blanketing the material's surface.

"The long wavelengths we saw didn't correspond to any known behavior of the crystal," Crommie said. "We scratched our heads for a long time. What could cause such long wavelength modulations in the crystal? We ruled out the conventional explanations one by one. Little did we know that this was the signature of spinon ghost particles."

This exotic particle had an out-of-body experience; these scientists took a picture of it
Illustration of an electron breaking apart into spinon ghost particles and chargons inside a 
quantum spin liquid. Credit: Mike Crommie et al./Berkeley Lab

How spinons take flight while chargons stand still

With help from a theoretical collaborator at MIT, the researchers realized that when an electron is injected into a QSL from the tip of an STM, it breaks apart into two different particles inside the QSL—spinons (also known as ghost particles) and chargons. This is due to the peculiar way in which spin and charge in a QSL collectively interact with each other. The spinon ghost particles end up separately carrying the spin while the chargons separately bear the electrical charge.

In the current study, STM/STS images show that the chargons freeze in place, forming what scientists call a star-of-David charge-density-wave. Meanwhile, the spinons undergo an "out-of-" as they separate from the immobilized chargons and move freely through the material, Crommie said. "This is unusual since in a conventional material, electrons carry both the spin and charge combined into one particle as they move about," he explained. "They don't usually break apart in this funny way."

Crommie added that QSLs might one day form the basis of robust quantum bits (qubits) used for quantum computing. In conventional computing a bit encodes information either as a zero or a one, but a qubit can hold both zero and one at the same time, thus potentially speeding up certain types of calculations. Understanding how spinons and chargons behave in QSLs could help advance research in this area of next-gen computing.

Another motivation for understanding the inner workings of QSLs is that they have been predicted to be a precursor to exotic superconductivity. Crommie plans to test that prediction with Mo's help at the ALS.

"Part of the beauty of this topic is that all the complex interactions within a QSL somehow combine to form a simple ghost particle that just bounces around inside the crystal," he said. "Seeing this behavior was pretty surprising, especially since we weren't even looking for it."Researchers discover a unique orbital texture in single-layer of 3-D material

More information: Ruan, W., Chen, Y., Tang, S. et al. Evidence for quantum spin liquid behaviour in single-layer 1T-TaSe2 from scanning tunnelling microscopy. Nat. Phys. (2021). doi.org/10.1038/s41567-021-01321-0 , www.nature.com/articles/s41567-021-01321-0

Journal information: Nature Physics 

Provided by Lawrence Berkeley National Laboratory 


SpaceX Starship to Take Civilians Where Civilians Never Went Before: to the dearMoon

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 In 2024, NASA is scheduled to return humans to the surface of the Moon with the Artemis III mission. One year before that, Artemis II should circle the satellite without touching down. Both missions are to be crewed by experienced astronauts. But not the dearMoon mission, which will carry civilians to the Moon and back on SpaceX hardware.

Back in 2018, a guy named Yusaku Maezawa, owner of a Japanese online fashion retail giant called Zozotown and founder of the local Contemporary Art Foundation, paid an undisclosed fortune to earn the privilege to ride what was then known as the Big Falcon Rocket all the way to the Moon and back.

For a while, Maezawa looked left and right for people to go with him. At one point, he even tried to find a lady friend to accompany him to the stars, but he eventually gave that plan up.

You see, the man did not just pay for his own seat on the rocket (we now call that rocket Starship), but for the entire damn thing. That would be a seat for himself, eight seats for an equal number of civilians, and one or two seats for crew members.

So, a total of at least ten people, the largest number ever sent to space on a single mission, and only a fraction of the planned capacity of 100 humans the Starship should be capable of carrying in Mars-going configuration.

Maezawa himself dubbed his mission dearMoon, and if successful, it will go down in history as the longest (both in terms of distance and time) trip ever taken by civilians, and it will also probably open the doors for true space tourism, not the kind Jeff Bezos and Richard Branson are promising.

In March 2021, Maezawa announced he wants to “give as many talented individuals as possible the opportunity to go” on dearMoon, so he launched a social-media call to arms. By the end of June, the selection of the eight civilians was completed (after combing through some 1 million entries), although we don’t know many of their names yet.

We do know most of them are artists (the Japanese man owns an art foundation, remember?), who will be taken to the sky to find inspiration and create something new.

Although not much news comes out of the dearMoon headquarters, the timeline of the mission shows how throughout next year the civilian crew will be undergoing training in preparation for their trip to the space one year later.

Now, all this dearMoon experiment of course is dependent on the Starship being ready by then. To date, SpaceX has flown only prototypes inside the atmosphere, trying to make the damn thing land properly. They eventually did, and are now planning an orbital flight sometime over the next few weeks.

The ship that will be used for the orbital mission will, of course, not be the one that will go to the Moon. That one will be much larger, offering something on the lines of 35,000 cubic feet (1,000 cubic meters) of pressurized volume, divided into common areas, galley, and a solar storm shelter. For parts of the trip, the people onboard would be wearing the SpaceX spacesuits we all know by now. As per the current details of the dearMoon mission, the entire flight around the Moon should take about six days.

Before he goes to the Moon accompanied by artists, though, Maezawa is scheduled to head to the International Space Station in December this year, after he paid probably another fortune to be taken up there by a company called Space Adventures onboard a Russian Soyuz rocket.