Light can now be made to act like a solid and a liquid at the same time, according to a newly reported quantum finding that its authors describe as a major step forward in quantum physics. The team observed a state in which the crystal-like ordering of a solid mixes with the frictionless flow of a superfluid, a combination that had previously appeared only in tightly controlled settings.
What sets the result apart is the temperature at which it appears. Most exotic quantum matter requires extreme cold, often close to absolute zero, which makes experiments expensive and difficult to repeat. The new state emerges at room temperature, removing one of the practical obstacles that has kept such phenomena confined to specialized laboratories.
The researchers say that easier access to this kind of quantum behavior could open the way to new technologies that use light rather than electrons to process information. Light-based computing has long been of interest because light can carry signals quickly, and the same properties could support new kinds of sensors that detect small changes in their surroundings.
The findings remain at an early stage. Building working devices from this state is still a considerable distance away, and the reporting on the work does not yet show when or whether it could be turned into products. Still, the result moves the field closer to practical applications than many earlier demonstrations of exotic quantum matter.
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