Quantum whistling in superfluid 4He
E. Hoskinson, R. E. Packard

TL;DR
This paper reports the observation of Josephson oscillations in superfluid helium-4 through nanometer-sized apertures at 2K, demonstrating macroscopic quantum coherence that could lead to advanced rotation sensors.
Contribution
First experimental observation of Josephson oscillations in superfluid helium-4 at relatively high temperature, showing coherence across multiple apertures.
Findings
Oscillations obey the Josephson frequency equation.
Oscillations are coherent among all apertures.
Phenomenon observed at 2K, much higher than similar effects in helium-3.
Abstract
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.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
