Fermilab Develops Tunable Quantum Detector to Accelerate Dark Matter Search

New electronically-tuned device scans 20x faster while maintaining sensitivity for dark photon detection.

Apr. 7, 2026 at 1:24pm

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A highly textured, abstract painting in soft earth tones featuring sweeping geometric arcs, concentric circles, and precise spirals, conceptually representing the complex electromagnetic forces and quantum phenomena involved in a tunable dark matter detector.An advanced quantum sensor developed at Fermilab aims to accelerate the search for dark matter by precisely tuning its frequency to detect the elusive particles.Chicago Today

Researchers at Fermi National Accelerator Laboratory (FNAL), in collaboration with scientists from the University of Chicago, Stanford University, and New York University, have developed an electronically-tunable quantum detector that significantly speeds up the search for dark photons, a leading candidate for dark matter. The new system uses a SQUID-based design with flux tuning to scan frequencies 20 times faster and with less noise than traditional mechanical tuning methods, helping narrow the possible frequency range for dark matter.

Why it matters

Finding evidence of dark matter could lead to a greater understanding of the universe and how it works. However, the search for dark matter particles has been hindered by the incredibly broad range of possible masses and signal frequencies. This new tunable quantum detector represents a major advancement in the tools available to scientists searching for these elusive particles.

The details

The detector uses a superconducting quantum interference device (SQUID) placed inside a 3D microwave cavity. By applying electromagnetic flux to the SQUID, the researchers can precisely control its frequency, allowing the device to 'listen' to different frequencies without the need for physical mechanical tuning. This flux tuning enables a scanning rate 20 times faster than traditional methods, covering a 22 MHz range over just three days. While the search did not uncover any dark photons, it helped narrow the possible frequency range where dark matter could exist.

  • The research and findings were reported in April 2026.
  • The detector scanned a 22 MHz frequency range over a three-day period.

The players

Fermi National Accelerator Laboratory (FNAL)

A U.S. Department of Energy national laboratory that specializes in high-energy particle physics research, including the development of advanced quantum sensors for dark matter detection.

Aaron Chou

A scientist at Fermilab who worked on the development of the tunable quantum detector.

Fang Zhao

A former Fermilab postdoctoral researcher who led the study on the tunable quantum detector.

Ziqian Li

A former University of Chicago graduate student who also worked on the tunable quantum detector project.

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What they’re saying

“Fermilab's longstanding expertise in designing and building ultrasensitive, low-noise electronics makes it the ideal place to further this technology for next-generation quantum science research like dark matter searches.”

— Aaron Chou, Scientist, Fermilab

“Rather than physically turning a dial to a specific frequency like with a radio, we apply electromagnetic flux to the SQUID, precisely controlling its ability to oppose changes in electricity flowing through it.”

— Fang Zhao, Former Fermilab Postdoctoral Researcher

“Without the ability to electrically tune its frequency, you would have to build billions of detectors to capture the signal. In contrast, we can build a few flux-tunable detectors and place them at various frequencies, enabling capture of possible signals much faster than before.”

— Ziqian Li, Former University of Chicago Graduate Student

What’s next

Researchers are working to scale up the technology by combining multiple cavities, each covering a different frequency range, with a single tunable element to simultaneously scan a much wider range of frequencies in the search for dark photons.

The takeaway

This new electronically-tunable quantum detector represents a significant advancement in the tools available to scientists searching for dark matter. By dramatically increasing the scanning speed and sensitivity while reducing noise, it brings the discovery of these elusive particles one step closer.