Physicists ‘entangle’ individual molecules for the first time, hastening possibilities for quantum information processing
In work that could lead to more robust quantum computing, Princeton researchers have succeeded in forcing molecules into quantum entanglement.
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LASER SETUP FOR COOLING, CONTROLLING, AND ENTANGLING INDIVIDUAL MOLECULES.
view moreCREDIT: PHOTO BY RICHARD SODEN, DEPARTMENT OF PHYSICS, PRINCETON UNIVERSITY
For the first time, a team of Princeton physicists have been able to link together individual molecules into special states that are quantum mechanically “entangled.” In these bizarre states, the molecules remain correlated with each other—and can interact simultaneously—even if they are miles apart, or indeed, even if they occupy opposite ends of the universe. This research was recently published in the journal Science.
“This is a breakthrough in the world of molecules because of the fundamental importance of quantum entanglement,” said Lawrence Cheuk, assistant professor of physics at Princeton University and the senior author of the paper. “But it is also a breakthrough for practical applications because entangled molecules can be the building blocks for many future applications.”
These include, for example, quantum computers that can solve certain problems much faster than conventional computers, quantum simulators that can model complex materials whose behaviors are difficult to model, and quantum sensors that can measure faster than their traditional counterparts.
“One of the motivations in doing quantum science is that in the practical world it turns out that if you harness the laws of quantum mechanics, you can do a lot better in many areas,” said Connor Holland, a graduate student in the physics department and a co-author on the work.
The ability of quantum devices to outperform classical ones is known as “quantum advantage.” And at the core of quantum advantage are the principles of superposition and quantum entanglement. While a classical computer bit can assume the value of either 0 or 1, quantum bits, called qubits, can simultaneously be in a superposition of 0 and 1. The latter concept, entanglement, is a major cornerstone of quantum mechanics, and occurs when two particles become inextricably linked with each other so that this link persists, even if one particle is light years away from the other particle. It is the phenomenon that Albert Einstein, who at first questioned its validity, described as “spooky action at a distance.” Since then, physicists have demonstrated that entanglement is, in fact, an accurate description of the physical world and how reality is structured.
“Quantum entanglement is a fundamental concept,” said Cheuk, “but it is also the key ingredient that bestows quantum advantage.”
But building quantum advantage and achieving controllable quantum entanglement remains a challenge, not least because engineers and scientists are still unclear about which physical platform is best for creating qubits. In the past decades, many different technologies—such as trapped ions, photons, superconducting circuits, to name only a few—have been explored as candidates for quantum computers and devices. The optimal quantum system or qubit platform could very well depend on the specific application.
Until this experiment, however, molecules had long defied controllable quantum entanglement. But Cheuk and his colleagues found a way, through careful manipulation in the laboratory, to control individual molecules and coax them into these interlocking quantum states. They also believed that molecules have certain advantages—over atoms, for example—that made them especially well-suited for certain applications in quantum information processing and quantum simulation of complex materials. Compared to atoms, for example, molecules have more quantum degrees of freedom and can interact in new ways.
“What this means, in practical terms, is that there are new ways of storing and processing quantum information,” said Yukai Lu, a graduate student in electrical and computer engineering and a co-author of the paper. “For example, a molecule can vibrate and rotate in multiple modes. So, you can use two of these modes to encode a qubit. If the molecular species is polar, two molecules can interact even when spatially separated.”
Nonetheless, molecules have proven notoriously difficult to control in the laboratory because of their complexity. The very degrees of freedom that make them attractive also make them hard to control, or corral, in laboratory settings.
Cheuk and his team addressed many of these challenges through a carefully thought-out experiment. They first picked a molecular species that is both polar and can be cooled with lasers. They then laser-cooled the molecules to ultracold temperatures where quantum mechanics takes centerstage. Individual molecules were then picked up by a complex system of tightly focused laser beams, so-called “optical tweezers.” By engineering the positions of the tweezers, they were able to create large arrays of single molecules and individually position them into any desired one-dimensional configuration. For example, they created isolated pairs of molecules and also defect-free strings of molecules.
Next, they encoded a qubit into a non-rotating and rotating state of the molecule. They were able to show that this molecular qubit remained coherent, that is, it remembered its superposition. In short, the researchers demonstrated the ability to create well-controlled and coherent qubits out of individually controlled molecules.
To entangle the molecules, they had to make the molecule interact. By using a series of microwave pulses, they were able to make individual molecules interact with one another in a coherent fashion. By allowing the interaction to proceed for a precise amount of time, they were able to implement a two-qubit gate that entangled two molecules. This is significant because such an entangling two-qubit gate is a building block for both universal digital quantum computing and for simulation of complex materials.
The potential of this research for investigating different areas of quantum science is large, given the innovative features offered by this new platform of molecular tweezer arrays. In particular, the Princeton team is interested in exploring the physics of many interacting molecules, which can be used to simulate quantum many-body systems where interesting emergent behavior such as novel forms of magnetism can appear.
“Using molecules for quantum science is a new frontier and our demonstration of on-demand entanglement is a key step in demonstrating that molecules can be used as a viable platform for quantum science,” said Cheuk.
In a separate article published in the same issue of Science, an independent research group led by John Doyle and Kang-Kuen Ni at Harvard University and Wolfgang Ketterle at the Massachusetts Institute of Technology achieved similar results.
“The fact that they got the same results verify the reliability of our results,” Cheuk said. “They also show that molecular tweezer arrays are becoming an exciting new platform for quantum science.”
The study, “On-Demand Entanglement of Molecules in a Reconfigurable Optical Tweezer Array,” by Connor M. Holland, Yukai Lu, and Lawrence W. Cheuk was published in Science on December 8, 2023. DOI: 10.1126/science.adf4272
JOURNAL
Science
METHOD OF RESEARCH
Experimental study
ARTICLE TITLE
On-Demand Entanglement of Molecules in a Reconfigurable Optical Tweezer Array
ARTICLE PUBLICATION DATE
8-Dec-2023
Two studies demonstrate on-demand quantum entanglement in ultracold molecules
The controlled creation of quantum entanglement with molecules has been a long-standing challenge in quantum science. Now, in two new studies, researchers report a method for tailoring the quantum states of individual molecules to achieve quantum entanglement on demand. Their strategy presents a promising new platform for the advancement of quantum technologies such as computation and sensing. Quantum entanglement is one of the key defining features of quantum mechanics. It is central to many quantum applications. Because of their rich internal structure and long-lived rotational states, ultracold molecules have been proposed as promising candidates for qubits in quantum computing and quantum simulations. However, while entanglement has been achieved in various atomic, photonic, and superconducting platforms, controlling and manipulating entanglement between molecules on demand experimentally has been difficult. Now, in two different studies, Yicheng Bao and colleagues and Conner Holland and colleagues report a method to achieve controlled quantum entanglement of calcium fluoride (CaF) molecules. Bao et al. and Holland et al. make use of the long-range dipolar interaction between pairs of laser-cooled CaF molecules trapped in a reconfigurable optical tweezer array and successfully demonstrate the creation of a Bell state – an important class of entangled quantum state characterized by maximal entanglement between two qubits. The Bell state is a foundational concept for many quantum technologies. Both studies show that two CaF molecules located in neighboring optical tweezers and placed close enough to sense their respective long-range electric dipolar interaction led to an interaction between tweezer pairs, which dynamically created a Bell state out of the two previously uncorrelated molecules. “The demonstrated manipulation and characterization of entanglement of individually tailored molecules by Bao et al. and Holland et al. paves the way for developing new versatile platforms for quantum technologies,” writes Augusto Smerzi in a related Perspective.
JOURNAL
Science
ARTICLE TITLE
Dipolar spin-exchange and entanglement between molecules in an optical tweezer array
ARTICLE PUBLICATION DATE
8-Dec-2023
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