Phys. Rev. Lett. 60, 416–419 (1988)Josephson effect and quantum phase slippage in superfluidsReceived 24 August 1987; published in the issue dated 1 February 1988 We describe the operation of a hydromechanical resonator immersed in 4He and 3B superfluids and opened on the main bath by two holes, a micro-orifice acting as a weak link and a long parallel channel. Transitions between adjacent quantum states differing by one hydrodynamic circulation quantum can be induced coherently, yielding a succession of steps arranged in a staircase pattern. In 3He at about 0.8 mK and 0 bar, a nearly ideal, nondissipative hydrodynamic Josephson effect can be observed. © 1988 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.60.416
DOI:
10.1103/PhysRevLett.60.416
PACS:
67.40.-w, 67.50.Fi, 74.50.+r
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