Phonons, the smallest bits of sound, are the latest addition to quantum mechanical toolboxes.
that’s typically demonstrated with light or tiny particles like electrons and atoms . The achievement may one day lead to sound-based versions of quantum computers or extremely sensitive measuring devices. For now, it shows that mind-bending quantum weirdness applies to sound as well as it does to light.
Unlike photons, which can travel through empty space, phonons need a medium such as air or water — or in the case of the new study, the surface of an elastic material. “What’s really kind of, in my mind, amazing about that is that these sound waves [carry] a very, very small amount of energy, because it’s a single quantum,” Cleland says. “But it involves the motion of a quadrillion atoms that are all working together to [transmit] this sound wave.
The lab demonstration of the effect relied on sound millions of times higher in pitch than humans can hear, in a device cooled to temperatures very near absolute zero. Instead of speakers and microphones to create and hear the sound, the team used
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