A crucial building block for quantum computers based on sound has been shown to work for the first time
is created when an object or a substance, like air, vibrates. We hear it as a continuous noise, but it is actually a collection of tiny chunks of vibration, or particles of sound, called phonons.“Making a phonon requires that quadrillions of atoms move collectively, but in our experiment, each is a single quantum object. Physicists sometimes make phonons sound like they are just a convenient trick for thinking about sound, but here they are very real,” says Cleland.
His team built a chip-sized device that has components made of a perfectly conducting material and can create phonons one at a time before sending them to other parts of the device. The chip is kept in a powerful fridge at a temperature a so that the photons exhibit quantum effects. Each phonon was about a million times higher pitched than audible sound.component called a beam splitter. It consists of 16 tiny, parallel aluminium strips designed so that any sound that hits them gets reflected and transmitted in equal parts.
Here, they simultaneously sent two phonons from opposite directions into the beam splitter and saw their respective superposition states influence each other. In the future, they will use this procedure to implement simple operations that make up computer programs.
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