Fermilab welcomes first baby bison of 2026

Much of the universe remains invisible to us, and scientists at the U.S. Department of Energy’s Fermi National Accelerator Laboratory are developing new quantum technologies to search for it.

Dark photons are hypothetical particles that behave like an extremely weak, invisible version of an electromagnetic field. If they exist, they might occasionally deposit a tiny microwave signal into a detector.

The challenge for physicists is that they do not know the signal’s frequency in advance. It’s like scanning an endless radio dial of white noise, hoping to stumble upon a lone, faint broadcast from an unknown station. In a standard search, scientists use a microwave cavity, essentially a carefully engineered metal resonator, as a sensitive antenna. If a dark photon exists at the right frequency, it could deposit a faint signal into the cavity. But because the frequency is unknown, searches must tune and listen, one setting at a time.

To break through this scanning bottleneck, Lu is combining ultra-coherent cavity hardware with entangling operations, quantum-state preparation, and low-loss interconnects — specialized links that allow the cavities to share signals efficiently — so multiple cavities can function as a coordinated sensor array.

By linking the cavities via remote quantum entanglement, the sensors can operate as a single cohesive unit. This quantum-enhanced array allows the system to scan through the “radio dial” of frequencies much faster and with far greater sensitivity than a single sensor ever could.

“The key is not just building better cavities.” Lu said. “It is learning how to make many ultra-coherent sensors work together so entanglement becomes a real advantage in the experiment.”

A four-cavity prototype, designed as a foundation for larger arrays, is the project’s first milestone. While the initial system is modest in size, the architecture is built to scale.

“If we can demonstrate the right architecture and control at that scale, we can extend the same framework to much larger arrays,” Lu said.

The project leverages techniques from superconducting quantum computing, which are now proving especially powerful for sensing. These methods make it possible to prepare, entangle, and nondestructively measure highly excited nonclassical cavity states, which are key resources for turning quantum coherence into a practical sensing advantage.

Lu’s research aims to demonstrate a measurable quantum advantage in dark matter detection while also guiding the design of broader classes of quantum sensors, including future searches for particles such as axions. Beyond sensing, the same hardware and interconnect architecture is also key to the development of SQMS’s modular quantum computing and distributed quantum communication. These advances could ultimately benefit our society by enabling faster, more efficient computing systems and communication networks that are much more secure.

Inside an unassuming building on the campus of the South Dakota School of Mines and Technology in Rapid City, a small research team is tackling a challenge vital to the world’s largest neutrino experiment. Their work focuses on powering photon detectors, key instruments that could contribute to revealing our universe’s deepest secrets and ultimately uncover new physics.

Associate Professor David Martinez Caicedo is leading a research group of undergraduate and graduate students at the university, along with postdoctoral researchers, to perfect a method for carefully sending power to the highly sensitive photon detectors that will be installed within the Deep Underground Neutrino Experiment’s massive far detector modules.

Martinez is a member of the international collaboration for DUNE, composed of more than 1,500 scientists and engineers from over 35 countries and hosted by the U.S. Department of Energy’s Fermi National Accelerator Laboratory. DUNE will seek to deepen our understanding of neutrinos — mysterious subatomic particles that may have played a central role in tipping the scale toward there being more matter than antimatter in our universe.

Inception of an idea

In 2019, two Fermilab researchers began discussing ways to provide power to the two liquid-argon detector modules that would be installed at the DUNE far site a mile underground at the Sanford Underground Research Facility in South Dakota. While sending power to the first detector module was relatively straightforward, the second, called the vertical drift, presented a unique challenge due to its design. Flavio Cavanna, a senior scientist with Fermilab, was the point person to solve this problem.

“In the vertical drift design, there is no easy way to provide power to the photon detectors,” Cavanna said. “My first idea was to put it on the cathode, but we didn’t have any idea for how this would work.”

Cavanna reached out to Bill Pellico, a senior engineer with Fermilab, to chart a course to provide power to the vertical drift that would be compatible with the existing design of the detector module.

“Bill is an expert on high voltage and power delivery, and he came up with a couple ideas, one of which was to use power over fiber,” Cavanna said. While this technology exists in the market already, there was no clear indication it would work within a liquid-argon environment.

“In the vertical drift design, there is no easy way to provide power to the photon detectors.”

“I had some experience with using fiber technology, so in combination with Bill’s previous experience and proposal, we selected to move forward with exploring this technology,” Cavanna said.

After several years of testing and demonstrations, the DUNE collaboration approved the technology, and work began at CERN and Fermilab on prototypes. At that point, other institutions, including SD Mines and Stony Brook University in New York, became involved in the construction, quality control and installation of the power-over-fiber technology.

Going to extremes

To study neutrino interactions, DUNE will use liquid-argon time projection chamber technology. At room temperature argon is a gas, so for argon to reach its liquid state, it must be chilled below minus 300 degrees Fahrenheit (minus 184 degrees Celsius). Such extreme temperatures make it essential for researchers to find new ways to power the photon detectors.

“Particles generated after a neutrino interacts with an argon atom in the detector produce ionization electrons and scintillation light,” Martinez explained at SD Mines. “To detect the scintillation light, the photon detectors need to be powered while immersed in liquid argon. With these challenges in mind, we pursued a novel application of power-over-fiber technology.”

According to Pellico, the technology has strengths that prove especially useful where electronics in contact with high voltages need to be isolated from their surroundings.

“Optical fibers have previously been used at very low temperatures, such as in space applications or quantum computing experiments, so this is not new,” Pellico noted. “However, their use for carrying high-intensity photon power in a cryogenic application is novel.”

This innovative use of power-over-fiber technology allows the photon detectors to operate reliably in liquid argon and the high-voltage conditions of DUNE’s detectors. In addition to the temperature, the sheer size of DUNE’s detectors also pose a challenge. At nearly six stories tall and more than 72 yards long, scintillation light produced far from the photon detectors may not be collected. To improve light collection efficiency, researchers plan to increase photon detector coverage in parts of the detector that were not previously considered because of high-voltage environment. Increasing light collection will improve the ability to study neutrinos from supernovae and solar neutrinos and could help scientists search for new physics beyond the Standard Model.

“So, how do you enhance the monitoring of interactions occurring inside the detector? We needed a system that allows us to place more photon detectors,” Pellico said. “The power-over-fiber technology would allow researchers to better analyze those interactions that would perhaps otherwise go undetected by having the ability to place more detectors.”

After a three-year effort of experimentation and working with different vendors, the power-over-fiber team was able to develop a system that could work at extremely cold temperatures and provide the DUNE researchers the line-of-sight they needed.

“We ended up working with a vendor that was able to obtain up to 55% optical to electrical power conversion efficiency under cryogenic conditions, so we can use this efficient system to power photon detectors,” Pellico said. “We now have a way to place photon detectors anywhere in the detector.”

Launch-ready technology

Importantly, this power-over-fiber technology is being treated as “launch technology.”

“Just like launching a system into space, once the technology is deployed inside the detectors, it is expected to be operational for the entirety of those detectors’ lifetimes,” Pellico said. “Repairs are not feasible.”

Unlike conventional copper cables, power-over-fiber components such as lasers, fibers and optical power converters are very delicate. This could mean that, if not carefully handled during installation, issues could arise during assembly of the DUNE far detector. To ensure success, Martinez and his team at SD Mines have engaged in significant testing and planning in advance of installation. Due to the customization of the technology, all the components must be inspected and qualified — not only at room temperature but also at cryogenic temperatures.

“To characterize how the power-over-fiber system works in cryogenic conditions, we built a long-term test here at SD Mines,” said Jairo Rodriguez, a graduate student in Martinez’s group.

“We send laser light through a fiber to an optical power converter that is inside a dewar [an insulated storage container] filled with liquid nitrogen, and we monitor its voltage to check proper system behavior,” added Denis Torres, a graduate student also working in the group.

It was very exciting to see this milestone, not just for DUNE, but for the high-energy physics community as well.”

This testing has been running for over two years and the system has remained operational, with data demonstrating the stability of the system. “We are monitoring the system every day and determine if there are any variations and where these could come from,” Denis said.

Diana Leon, a graduate student in the SD Mines group, traveled to CERN in 2023 and 2024 to help lead in the installation of the power-over-fiber system for ProtoDUNE, a prototype of the DUNE detector. Commissioning and operation of the power-over-fiber technology followed in 2025. This test was critical for determining how effectively it can be applied in a large-scale detector prototype. After commissioning, and prior to the start of operation, the team anxiously watched as the detector was powered up.

As they had hoped, all of the photon detectors activated and functioned according to plan. “When all of the photon detectors were turned on, we were so happy to see the power-over-fiber technology working after many years of work,” Leon recalled.

“When we clicked that button in 2025, all the channels were working just like the light bulb in your room,” Cavanna recalled. “In one click, they didn’t blink or have any faults. It’s been a year and there’s been no failure.”

“It is one of the greatest memories I’ve had in my entire life,” Cavanna added.

“I was here in South Dakota when the photon detectors on the prototype detector at CERN turned on,” added Martinez. “I received a text message early in the morning that read, ‘It works!’ It was very exciting to see this milestone, not just for DUNE, but for the high-energy physics community as well.”

Diana will soon be traveling to CERN again, this time to practice the mechanical integration of power-over-fiber technology. The work will occur at CERN on a mock-up detector, which will be the same height as the actual DUNE detector.

Martinez emphasized the importance of the close collaboration of his group with Fermilab and is also proud of the work the power-over-fiber team at SD Mines has accomplished for DUNE. “The students are involved in the entire process,” he said. “They had the opportunity to put their hands on it, installing and operating power-over-fiber technology and closely collaborating with experts at Fermilab. All the team here, including undergraduate and graduate students, the postdoctoral researcher, and Connie Krosschell, our department secretary, have a role to play. So, everyone has their own contribution, but we pull together as a team.”

Benefits beyond DUNE

Biswaranjan Behera, a former postdoctoral researcher who worked with both Pellico and Martinez and is currently a Ramanujan Fellow at the Center for High Energy Physics at the Indian Institute of Science in Bangalore, noted that power-over-fiber technology at cryogenic temperatures could be used far beyond high-energy particle physics experiments.

“With innovative technologies working together, including the novel implementation of power-over-fiber, DUNE has strong potential for groundbreaking discoveries,” Behera said. “But, also, we are working on a new application of the technology for use in other cryogenic environments.”

“The DUNE future is bright, and we are making engineering advances and developing tools necessary for cutting-edge neutrino research.”

Certain sectors of the economy, such as quantum computing, data centers and space exploration stand to benefit from this technology. Power over fiber technology offers low noise, superior isolation, optimal efficiency and is immune to electromagnetic interference, while also performing reliably at cryogenic temperatures.

“This can be used in any type of system where it’s cold and you want to monitor what’s going on,” Pellico said. “Electronics become more efficient at cryogenic temperatures, creating opportunities for AI data centers to operate in extreme cold with improved energy efficiency.”

Ultimately, the advancements made for the Deep Underground Neutrino Experiment are paving the way for a more integrated, high-tech future. “The DUNE future is bright, and we are making engineering advances and developing tools necessary for cutting-edge neutrino research,” Behera added. “In addition, with artificial intelligence already widely employed in DUNE, great things are on the horizon.”

Spring has blossomed on the prairie land at Fermi National Accelerator Laboratory with one of the laboratory’s most cherished traditions: the arrival of the first newborn American bison calf. Today, the first cinnamon-colored baby bison was born and is healthy, and the calf is staying close to its mother as it takes its first steps on the open grassland. 

Establishing and maintaining the bison herd at Fermilab is a bold symbol of the laboratory’s achievements on the frontiers of science. By establishing the herd of bison, the founder of Fermilab, Robert Wilson, intended to connect the laboratory with the Illinois prairie that once dominated the region. He believed that a cutting‑edge scientific facility should also honor the history and environment of the land it occupies.

“People come to Fermilab for world‑class science, but the bison herd has become one of the most beloved parts of our identity,” said Fermilab Director Norbert Holtkamp. “Fermilab occupies a very special place with the local community and in the global scientific landscape.”

Bison are hardy animals that can live outside year-round in most any weather. The Fermilab herd is managed to live naturally on the prairie, with Fermilab keepers only providing them with structures within corrals to block the strong winds that swirl across Fermilab’s flat landscape.

The current herd consists of two bulls and 23 female cows. Bison calving season at the lab usually starts in the middle of April and continues until June. Each spring, the lab’s herdsman Cleo Garcia, expects approximately 20 new calves. Last year, 20 babies were born, with four calves arriving by surprise in late summer.

During calving season, Garcia feeds the bison and checks on them daily, studying the cows for hints that they may soon give birth. He also monitors the young calves to make sure that they are healthy and adapting well to their new environment. In the winter, the herd’s food is supplemented with hay and grain when grass is not as plentiful.

Fermilab refreshes the bulls in the herd every five to seven years. The bulls are pure-bred American bison and have been genetically tested. This is important in maintaining the health of the herd. Eleven years ago, Fermilab tested the entire herd and determined that there were no domesticated cattle genes present.

To the staff members, the arrival of the calves is more than just a charming sight — it is a reminder of the lab’s commitment to blending world‑class scientific research with an appreciation of nature. The calves grow up alongside the lab’s ongoing ecology and restoration efforts, including conservation of wildlife throughout the 6,800 acres of land by maintaining a healthy, biodiverse ecosystem.

The bison stand as a bridge between past and future, linking a modern particle physics laboratory with the natural landscapes that once dominated northern Illinois. And as the new calves take their first steps, they continue a legacy that has become a part of Fermilab’s identity since 1969.

The public is welcome to view the herd anytime on the web 24-7 with the bison camera or by visiting Fermilab’s outdoor public areas from dawn to dusk every day of the week. Please visit the hours and public access webpage for information and requirements for visiting the lab, and celebrate the arrival of spring along with Fermilab’s newest additions.

The Fermilab site has been designated a National Environmental Research Park by the U.S. Department of Energy. The lab’s environmental stewardship efforts are supported by the Department of Energy Office of Science and by Fermilab Natural Areas.

A tiny elementary particle called the muon has won a big prize, the Breakthrough Prize in Fundamental Physics. Fermilab researchers are among the winners of this year’s Breakthrough Prize, one of the world’s most notable and prestigious scientific awards that celebrates new scientific discoveries. Each prize is $3 million and is presented in the fields of Life Sciences, Fundamental Physics and Mathematics.

The 2026 award in Fundamental Physics recognized three generations of the Muon g-2 experiment, which provided the world’s most precise measurement to date of the muon, one of the fundamental subatomic particles. The experiment began at CERN in the 1970s, shifted to Brookhaven National Laboratory in the 1990s and concluded at Fermilab with final publication in 2025.

“I’m proud of the role Fermilab played in the Muon g-2 experiment, which is set to stand as the most accurate measurement of the muon for years to come,” said Fermilab Director Norbert Holtkamp. “Fermilab has a strong role as a collaborator and integrator, and this was demonstrated by our work with our colleagues at CERN, Brookhaven and institutions from around the world.”

The Breakthrough Prize, renowned as the “Oscars® of Science,” recognizes the world’s top scientists. The $3 million prize is being awarded to the hundreds of collaborators who contributed to publications reporting key results from CERN, Brookhaven and Fermilab.

Fermilab scientist Chris Polly was among the four members of the scientific collaborations who accepted the prize. Others included: Bradley Lee Roberts of Boston University, William M. Morse of Brookhaven National Laboratory and David Hertzog of the University of Washington. The prize was presented at a ceremony at the Barker Hangar in Santa Monica, California, on Saturday, April 18, 2026.

The three generations of Muon g-2 experiments were designed to measure the magnetic moment of the muon with ever-increasing precision, exploring the quantum realm where particles briefly appear and vanish—and where even tiny deviations could point to entirely new laws of nature outside of the current Standard Model of Particle Physics.

The latest and most precise measurement of the muon’s magnetic moment was announced by Fermilab in 2025 and was important because it provided a sensitive test of the Standard Model of particle physics.

Fermilab led the most recent stage of the experiment that reused a 50-foot-diameter superconducting magnetic storage ring from the Brookhaven National Laboratory experiment when it was transported on a land-and-sea journey in 2013 from Long Island, New York to Fermilab in Illinois.

In 2021, the first result from the Muon g-2 experiment at Fermilab confirmed a two-decade-old measurement from Brookhaven, revealing a tantalizing tension with established theoretical predictions—while new calculations continue to refine what the Standard Model itself expects. The second run at Fermilab further improved the precision measurement. The third and final result in 2025 was in perfect agreement with the experiment’s previous results and proved to be the world’s most precise measurement of the muon magnetic anomaly.

The Breakthrough Prizes were founded by Sergey Brin, Priscilla Chan and Mark Zuckerberg, Julia and Yuri Milner, and Anne Wojcicki and have been sponsored by foundations established by them. Selection Committees composed of previous Breakthrough Prize laureates in each field choose the winners. Information on the Breakthrough Prize is available at breakthroughprize.org.