Quantum behavior discovered in liquids

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Physicists at Yale for the first time directly observed quantum behaviour in the vibrations of a liquid body. We can now extend the list from liquid, gas and solid with the addition of a Quantum Spin Liquid (QSL). This has caused quite a high level of excitement amongst scientists. This new experiment opens a potentially rich area of further study into the way quantum principles work on liquid bodies.

“We filled a specially designed cavity with superfluid liquid helium,” Harris explained. “Then we use laser light to monitor an individual sound wave in the liquid helium. The volume of helium in which this sound wave lives is fairly large for a macroscopic object — equal to a cube whose sides are one-thousandth of an inch.”

The team discovered that they could detect the sound wave’s quantum properties: its zero-point motion, which is the quantum motion that exists even when the temperature is lowered to absolute zero. It is still early days but the discovery should have implications for Quantum Computing.

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.153601

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