Mechanical Cooper pair transportation as a source of long-distance superconducting phase coherence.
Transportation of Cooper pairs by a movable single Cooper-pair box placed between two remote superconductors is shown to establish coherent coupling between them. This coupling is due to entanglement of the movable box with the leads and is manifested in the suppression of quantum fluctuations of the relative phase of the order parameters of the leads. It can be probed by attaching a high resistance Josephson junction between the leads and measuring the current through this junction. The current is suppressed with increasing temperature.
Isacsson
A
A
Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
Gorelik
L Y
LY
Shekhter
R I
RI
Galperin
Y M
YM
Jonson
M
M