Continuous Variable Entanglement of Two Mesoscopic Josephson Junctions Induced by a Thermal Radiation Field |
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Authors: | CHANG Ping SHAO Bin WANG Zhao-Ming ZOU Jian |
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Institution: | Department of Physics, Beijing Institute of Technology,
Beijing 100081, China |
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Abstract: | The continuous-variable
(CV) entanglement between two mesoscopic Josephson junctions is
studied and the time-dependent characteristic function in Wigner
representation for the Josephson junction subsystem driven by a
single-mode thermal field is analytically obtained. It is found that
an initial lowest energy state of the junction subsystem can evolve
into a two-mode entangled Gaussian state through the interaction
with the thermal radiation field. Furthermore, we investigate the
influence of the temperature on the entanglement of the junctions
and find that the CV entanglement of the two junctions shows the
critical behavior with respect to the temperature. |
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Keywords: | entanglement mesoscopic Josephson junction thermal field |
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