Thursday, August 21, 2025

UW research shows Fresh Bucks program improves fruit and vegetable intake, food security




University of Washington





New research from the University of Washington shows that the City of Seattle’s Fresh Bucks program can improve fruit and vegetable intake and food security among low-income populations by providing financial support for buying healthy food.

The Fresh Bucks program works with local partners to help Seattle residents access healthy food. The program accepts applications from Seattle households with income less than 80% of the area median — $110,950 for a family of four in 2024. Recipients can use the $40 per month benefit to purchase fruits and vegetables at more than 40 retail locations throughout Seattle, including farmers markets, Safeway stores and independently owned grocery stores.

The study, published Aug. 19 in JAMA Network Openshows that Fresh Bucks households experience a 31% higher rate of food security and consume at least three daily servings of fruits and vegetables 37% more often than those assigned to a program waitlist.

“I would classify both of those numbers as pretty large,” said Jessica Jones-Smith, co-author, UW affiliate professor of health systems and population health and of epidemiology and University of California, Irvine professor of health, society and behavior. “We don’t routinely see interventions that work that well. It’s a pretty big impact on diet in terms of what we can do from a policy perspective and expect to make a difference in food insecurity.”

Food insecurity, or the lack of access to nutritionally adequate foods, is linked to lower-income households and is often associated with poor nutrient intake, diabetes and hypertension. Diet quality, including fruit and vegetable intake, impacts the risk for premature disability and death from cardiometabolic disease, cancer and other causes. But fresh fruits and vegetables tend to be less available in lower-income neighborhoods and more expensive than processed foods.

“The UW’s study helps us understand how the City of Seattle’s Fresh Bucks program shows up in the day-to-day decisions of our enrolled households,” said Robyn Kumar, Fresh Bucks program manager at the City of Seattle Office of Sustainability. “Findings show that the healthy food access program makes a tangible difference for customers, significantly increasing food security and fruit and vegetable intake. We know these lifestyle changes have long-lasting benefits, and Fresh Bucks is helping to ensure that our most overburdened community members have equitable access to healthy foods and increased quality of life.”

In October 2021, 6,900 new applicants and existing beneficiaries applied to receive benefits in 2022. The total number of applicants exceeded program funding, so 4,200 households were randomly chosen to receive benefits. The remaining applicants were placed on a waitlist. The City of Seattle then mailed a follow-up survey to all 6,900 applicants in July 2022. The sample for this study consists of the 1,973 households who completed and returned the survey.

Researchers compared new applicants who received the benefit and new applicants assigned to the waitlist. They also considered the impact of losing Fresh Bucks by comparing returning applicants who were placed on the waitlist with those who continued receiving benefits. Losing the benefit reduced food security by 29% and resulted in households being 26% less likely to eat fruits and vegetables at least three times a day.

“The results were quite symmetric,” said Melissa Knox, lead author and UW teaching professor of economics. “The people who gained the program saw nearly the same benefit as what was lost by the people who lost the program. So, it seems like there are two things going on: One is that the program is helping people, and the other is these effects don’t magically sustain themselves without funding.”

Because of the health risks associated with poor diet, insurers have recently shown increased interest and investment in “food is medicine,” or FIM, programs, which include produce prescriptions and programs that provide free, healthy food for patients. Before FIM programs, federal grants funded “nutrition incentive programs” to increase healthy food access and food security.

But Fresh Bucks differs from other healthy food benefit programs in several ways, including focused enrollment within households disproportionately impacted by food insecurity and diet-related chronic disease, divesting enrollment from SNAP participation, enabling participants to redeem benefits at a large chain food retailer and smaller local stores and no required match spending — where participants receive additional benefits based on how much of their own money they spend.

“We clearly see that once this program goes away, people can no longer afford to eat these foods, as evidenced by the increase in fruits and vegetables when people are receiving the benefit, but the near symmetric decrease when benefits are lost,” Jones-Smith said. “I think that really drives home the fact that money or material resources are necessary for enacting this kind of dietary change.”

Other co-authors from the UW include Jamie Wallace, recently graduated doctoral student of health systems and population health; Barbara Baquero, associate professor of health systems and population health; and KeliAnne Hara-Hubbard, community research coordinator. The study was funded by the National Heart, Lung and Blood Institute of the National Institutes of Health.

For more information, contact Knox at knoxm@uw.edu.

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New study identifies key conditions for amplifying student voices in schools


“student voice practices” (SVPs)




Penn State





UNIVERSITY PARK, Pa. — Creating meaningful opportunities for students to help shape their own education isn’t simply a matter of inviting them to speak up. According to new research led by Penn State College of Education Professor Dana Mitra, it requires a careful balance of teacher mindsets, relationships and practical skills — what the study terms cognitive mindsets, emotive “heartsets” and intention-building skillsets.

The study, published in Teachers College Record: The Voice of Scholarship in Education and funded by the Bill & Melinda Gates Foundation, examined how “student voice practices” (SVPs) take root in schools. SVPs include structures and activities — such as advisory councils, classroom discussions or shared decision-making — that allow students to contribute meaningfully to school and classroom policies.

The study found that successful SVP implementation depends on:

  • Cognitive mindsets: Beliefs that students have the right to voice, can provide unique insights and can be partners in driving change.
  • Emotive "heartsets": Relationships built on trust and safety, where students see teachers as allies.
  • Intention-building skillsets: Training, structures and systems that support both students and teachers in sustaining SVPs.

These three dimensions reinforce each other, according to Mitra. For example, strong relationships (heartsets) can help shift mindsets toward genuine partnership, while well-designed structures (skillsets) create more opportunities to build trust.

“Student voice is more than a program or an event — it’s about creating a culture where students are seen as partners,” Mitra said. “That doesn’t happen by accident. Teachers need the mindset that students have a right to be heard, the relationships that make students feel safe to share and the skills to structure those opportunities.”

The researchers focused on four schools — two high schools and two middle schools — in a large urban district in the western United States known for promoting SVPs. All four served majority LatinĂ© student populations, with significant proportions of other historically marginalized students.

While the district had made student voice a priority at the policy level, implementation varied widely. The researchers conducted in-person interviews, observations and focus groups in spring 2022 and spring 2023, supplemented by online sessions in between. Both high schools consisted of approximately 1,500 students, while the middle schools served 1,000 and 1,500 students, respectively.

The results revealed a tension between aspirations and day-to-day realities, according to the researchers. Even in schools that wanted to prioritize student voice, safety concerns and high staff turnover often took precedence.

In multiple focus groups, students said they wanted more chances to contribute ideas, but only if they felt safe — physically and emotionally — in those spaces. In practice, the study found that the heartset dimension — trust and safety — often had to be addressed before the other two could take hold. In some schools, frequent physical altercations during lunch periods forced administrators to restructure the school day, separating students into smaller, same-age groups to reduce conflict. At another campus, staff members patrolled corridors, bathrooms and hidden corners to deter fights and theft — sometimes scattering groups of students, only to have them reconvene elsewhere.

“Before students can speak up, they have to trust the adults and feel safe in the building,” Mitra said. “That’s why the emotional heartset is just as important as the mindset. You can believe in student voice all you want, but without trust, students won’t share honestly.”

Students themselves drew a sharp contrast between “calm” classrooms, where teachers listened and adapted, and “wild” classrooms, where even well-intentioned teachers were drowned out by noise and disruption.

Mitra noted that teacher and administrator turnover can disrupt all three dimensions. Frequent staffing changes can erode trust, disrupt training continuity and shift school priorities away from student voice initiatives. Leadership, the researchers found, plays a critical role in buffering these disruptions. When school leaders embedded SVPs into their vision, budget and daily practices, they could keep the work moving forward even amid personnel changes.

“When you lose staff, you lose relationships, you lose institutional memory and you often lose momentum,” she said.

The findings suggest that districts aiming to expand student voice should address safety concerns first, ensuring students feel secure in sharing their perspectives. Training for both teachers and students can then build the skills needed for collaboration and shared decision-making, while structures such as advisory circles or reciprocal mentorships give those relationships room to grow. Finally, leadership stability and a clear commitment to SVPs help sustain the work over time, even when schools face challenges such as budget cuts, competing priorities or unexpected crises such as the COVID-19 pandemic.

“Leaders can make a huge difference by protecting student voice work from getting sidelined,” Mitra said. “That means embedding it in the school’s vision, providing ongoing training and making it part of ‘how we do things here.’”

The researchers are also developing tools to measure relational trust — a theme that emerged strongly across all sites.

“We know SVPs can improve school climate, boost engagement and make learning more relevant,” Mitra said. “The question now is how to create the conditions where they can thrive, even in challenging contexts.”

Mitra’s co-authors on the paper are Ghadir Al Saghir, a doctoral student in the Department of Education Policy Studies at Penn State; Jerusha Conner, professor of education, Villanova University; Samantha E. Holquist, senior researcher, American Institutes for Research; and Nikki L. Wright, assistant professor, Department of Educational Leadership, Ball State University.

SCI-FI-TEK

‘Rosetta stone’ of code allows scientists to run core quantum computing operations



Physicists winning the battle to reduce physical-to-logical qubit ratio



University of Sydney

Lead author and PhD student Vassili Matsos 

image: 

Lead author and PhD student Vassili Matsos looking at the Paul trap quantum computing device in the Quantum Control Laboratory at the University of Sydney.

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Credit: Fiona Wolf/University of Sydney





To build a large-scale quantum computer that works, scientists and engineers need to overcome the spontaneous errors that quantum bits, or qubits, create as they operate.

Scientists encode these building blocks of quantum information to suppress errors in other qubits so that a minority can operate in a way that produces useful outcomes.

As the number of useful (or logical) qubits grows, the number of physical qubits required grows even further. As this scales up, the sheer number of qubits needed to create a useful quantum machine becomes an engineering nightmare.

Now, for the first time, quantum scientists at the Quantum Control Laboratory at the University of Sydney Nano Institute have demonstrated a type of quantum logic gate that drastically reduces the number physical qubits needed for its operation.

To do this, they built an entangling logic gate on a single atom using an error-correcting code nicknamed the ‘Rosetta stone’ of quantum computing. It earns that name because it translates smooth, continuous quantum oscillations into clean, digital-like discrete states, making errors easier to spot and fix, and importantly, allowing a highly compact way to encode logical qubits.

GKP CODES: A ROSETTA STONE FOR QUANTUM COMPUTING

This curiously named Gottesman-Kitaev-Preskill (GKP) code has for many years offered a theoretical possibility for significantly reducing the physical number of qubits needed to produce a functioning ‘logical qubit’. Albeit by trading efficiency for complexity, making the codes very difficult to control.

Research published today in Nature Physics demonstrates this as a physical reality, tapping into the natural oscillations of a trapped ion (a charged atom of ytterbium) to store GKP codes and, for the first time, realising quantum entangling gates between them.

Led by Sydney Horizon Fellow Dr Tingrei Tan at the University of Sydney Nano Institute, scientists have used their exquisite control over the harmonic motion of a trapped ion to bridge the coding complexity of GKP qubits, allowing a demonstration of their entanglement.

“Our experiments have shown the first realisation of a universal logical gate set for GKP qubits,” Dr Tan said. “We did this by precisely controlling the natural vibrations, or harmonic oscillations, of a trapped ion in such a way that we can manipulate individual GKP qubits or entangle them as a pair.”

QUANTUM LOGIC GATE

A logic gate is an information switch that allows computers – quantum and classical – to be programmable to perform logical operations. Quantum logic gates use the entanglement of qubits to produce a completely different sort of operational system to that used in classical computing, underpinning the great promise of quantum computers.

First author Vassili Matsos is a PhD student in the School of Physics and Sydney Nano. He said: “Effectively, we store two error-correctable logical qubits in a single trapped ion and demonstrate entanglement between them.

“We did this using quantum control software developed by Q-CTRL, a spin-off start-up company from the Quantum Control Laboratory, with a physics-based model to design quantum gates that minimise the distortion of GKP logical qubits, so they maintain the delicate structure of the GKP code while processing quantum information.”

A MILESTONE IN QUANTUM TECHNOLOGY

What Mr Matsos did is entangle two ‘quantum vibrations’ of a single atom. The trapped atom vibrates in three dimensions. Movement in each dimension is described by quantum mechanics and each is considered a ‘quantum state’. By entangling two of these quantum states realised as qubits, Mr Matsos created a logic gate using just a single atom, a milestone in quantum technology.

This result massively reduces the quantum hardware required to create these logic gates, which allow quantum machines to be programmed.

Dr Tan said: “GKP error correction codes have long promised a reduction in hardware demands to address the resource overhead challenge for scaling quantum computers. Our experiments achieved a key milestone, demonstrating that these high-quality quantum controls provide a key tool to manipulate more than just one logical qubit.

“By demonstrating universal quantum gates using these qubits, we have a foundation to work towards large-scale quantum-information processing in a highly hardware-efficient fashion.”

Across three experiments described in the paper, Dr Tan’s team used a single ytterbium ion contained in what is known as a Paul trap. This uses a complex array of lasers at room temperature to hold the single atom in the trap, allowing its natural vibrations to be controlled and utilised to produce the complex GKP codes.

This research represents an important demonstration that quantum logic gates can be developed with a reduced physical number of qubits, increasing their efficiency.

Download photos of the researchers and artist’s impression at this link.

Interviews

Dr Tingrei Tan | tingrei.tan@sydney.edu.au

Media enquiries

Marcus Strom | marcus.strom@sydney.edu.au | +61 474 269 459

Outside of work hours, please call +61 2 8627 0246 (directs to a mobile number) or email media.office@sydney.edu.au. 

Research

Matsos, V. et al ‘Universal quantum gate set for Gottesman-Kitaev-Preskill logical qubits’ (Nature Physics 2025) DOI: 10.1038/s41567-025-03002-8

Declaration

The authors declare no competing interests. Funding was received from the Australian Research Council, Sydney Horizon Fellowship, the US Office of Naval Research, the US Army Research Office, the US Air Force Office of Scientific Research, Lockheed Martin, Sydney Quantum Academy and private funding from H. and A. Harley.

  

Artist's impression of the entangled logic gate built by University of Sydney quantum scientists.


Dr Tingrei Tan (left) and his PhD student Vassili Matsos inspect the Paul trap used in this experiment in the Quantum Control Laboratory at the University of Sydney Nano Institute.

Credit

Fiona Wolf/University of Sydney