UCLA observes quantum heat waves at room temperature in lab

A nanoscale gold probe sat on a piece of boron arsenide, heating it and tracing how the energy moved. At 80 Fahrenheit (27 degrees Celsius), physicists at the University of California, Los Angeles, saw heat form distinct patterns instead of spreading evenly in all directions. The UCLA team describes the observation as a global first for this quantum behavior at room temperature.

The effect is called phonon focusing. Phonons are vibrational energy packets that carry heat through a non-metallic material. In boron arsenide, the crystal structure creates natural funnels that let them travel without colliding into one another, while the material’s three-dimensional atomic orientation produces different ray patterns.

That is a sharp departure from the usual picture of heat transport at room temperature. The researchers mapped phonons moving up to 250 nanometers—a short distance, but one they say is sufficient evidence of focusing in an experiment of this type. They also report that temperature-dependent tests supported the technique’s robustness, reproducibility and nanoscale resolution.

For engineers, the practical implication is a new way to guide and redistribute heat inside future quantum devices. Thermal buildup limits processing power and scalability in computing, and quantum computers in particular are being designed around the hope of operating without ultra-cold conditions. Room-temperature phonon behavior does not solve that engineering challenge by itself, but it adds a controllable mechanism for moving heat where it needs to go.

The result remains laboratory research, not a deployed cooling system or a room-temperature quantum computer. The UCLA researchers say they will now work to convert the experiment into real-world applications, while the findings have been published in Nature Physics.