Entangled quantum currents in distant mesoscopic Josephson junctions

Details Entangled quantum currents in distant mesoscopic Josephson junctions Entangled quantum currents in distant mesoscopic Josephson junctions

2004-11-17

arxiv.org/abs/cond-mat/0411439v1

Journal of Physics: Condensed Matter 16 (2004) 9169-9180

Physics

Condensed Matter

Superconductivity

8 pages, 6 figures, two-column format; to appear in J. Phys.: Condens. Matt

Scientific paper

10.1088/0953-8984/16/50/008

Two mesoscopic SQUID rings which are far from each other, are considered. A source of two-mode nonclassical microwaves irradiates the two rings with correlated photons. The Josephson currents are in this case quantum mechanical operators, and their expectation values with respect to the density matrix of the microwaves, yield the experimentally observed currents. Classically correlated (separable) and quantum mechanically correlated (entangled) microwaves are considered, and their effect on the Josephson currents is quantified. Results for two different examples that involve microwaves in number states and coherent states are derived. It is shown that the quantum statistics of the tunnelling electron pairs through the Josephson junctions in the two rings, are correlated.

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