The material starts as a glass chip with a thin coat of gold. Physicists at Louisiana State University then cut hundreds of microscopic slits into that gold with focused ion beams, and the result, they say, is the first room-temperature quantum material able to tell different quantum states of light apart and send them down separate paths.
The work appeared in Nature, in a paper dated July 15, 2026. It was led by Omar S. Magaña-Loaiza, an associate professor of physics at LSU.
The cold problem
Most quantum materials show their odd properties only near absolute zero. At room temperature, constant atomic vibrations from heat swamp the fragile quantum effects. Holding those vibrations down takes large cryogenic cooling systems, which is why many promising materials stay in the lab.
The LSU team did not hunt for a natural material with the right behavior. They built one.
How it is made
Each slit in the gold acts as an artificial atom, which the researchers call a meta-atom. Together the slits form a crystal with no natural counterpart, and it is thinner than a human hair. Light entering the chip travels along the gold surface and hits the meta-atoms. By adjusting their size, shape and spacing, the team controlled the light in ways not shown before at room temperature.
“By engineering the distribution of meta-atoms in the plasmonic metacrystal, we can systematically dictate which quantum statistics are allowed to pass through the structure. So, our crystal essentially acts as a statistical filter on quantum states,” said Riley B. Dawkins, who recently finished his Ph.D. and is joining the National Institute of Standards and Technology as a postdoctoral research associate.
Sunlight, lasers and fluorescent lamps all give off photons, but the photons fluctuate and interact differently. Telling them apart has generally taken sophisticated instruments, detectors cooled to extreme lows, and millions of measurements. The metacrystal does the sorting on its own, responding to subtle quantum differences rather than just color or brightness.
Certain states also travel through it with less change to their statistics. “We call this robust transport,” Magaña-Loaiza said. “These quantum states carry information. Our crystal can distinguish them and move them from one point to another in a robust way without requiring cryogenic cooling. That’s what opens the door to practical quantum technologies.”
In the paper, the researchers describe it as the first room-temperature quantum material inherently sensitive to the quantum coherence of systems with many interacting particles. They named it the quantum statistical plasmonic metacrystal. They also report that it produces quantum statistical bands, which resemble the electronic bands that govern how electricity moves through semiconductors.
Chenglong You, a former postdoctoral researcher now a professor at the University of Electronic Science and Technology of China, said the best moment came when the unusual design behaved as theory predicted. “Seeing it work exactly as we predicted was incredibly rewarding,” he said.
What comes next
Magaña-Loaiza’s Quantum Photonics Group handled every stage, from the idea and theory through design, nanofabrication and testing. The team says the study gives a general recipe for designing other quantum materials, and sees possible uses in computing, secure communication, sensing and energy.
Solar cells are the next test. In a modern cell, some incoming sunlight gets trapped and ends up as heat rather than electricity. The researchers plan to put the metacrystal inside solar cells and measure whether it raises the share of sunlight converted to power.
The U.S. Department of Energy’s Office of Basic Energy Sciences funded the work under Award DE-SC0021069.
Sources
- World’s First Room-Temperature Quantum Material Sorts Light in an Unprecedented Way
- LSU physicists create first room-temperature quantum material
