Quantum whistling in superfluid 4He

Details Quantum whistling in superfluid 4He Quantum whistling in superfluid 4He

2004-12-15

arxiv.org/abs/cond-mat/0412416v1

Nature 433, 376 (27 Jan 2005)

Physics

Condensed Matter

Superconductivity

6 pages, 3 figures, to be published in Nature

Scientific paper

10.1038/433376a

Fundamental considerations predict that macroscopic quantum systems such as superfluids and the electrons in superconductors will exhibit oscillatory motion when pushed through a small constriction. Here we report the observation of these oscillations between two reservoirs of superfluid 4He partitioned by an array of nanometer-sized apertures. They obey the Josephson frequency equation and are coherent amongst all the apertures. This discovery at the relatively high temperature of 2K (2000 times higher than related phenomena in 3He) may pave the way for a new class of practical rotation sensors of unprecedented precision.

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