Dynamic interaction of mesoscopic Josephson junctions with quantized electromagnetic fields

Le-Man Kuang; Yiwen Wang; Mo-Lin Ge

doi:10.1103/PhysRevB.53.11764

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Dynamic interaction of mesoscopic Josephson junctions with quantized electromagnetic fields

Le-Man Kuang, Yiwen Wang, Mo-Lin Ge

DOI 10.1103/PhysRevB.53.11764 · Physical Review B

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Abstract

Dynamic evolution of a mesoscopic Josephson junction (MJJ) interacting with quantized electromagnetic fields (QEMF) is investigated. It is shown that the current-voltage steps of the MJJ can reflect quantum coherences of the external QEMF; these characteristics may be used to distinguish different types of quantum electromagnetic fields. It is found that supercurrent fluctuations exhibit periodic oscillations in the time evolution. Supercurrent correlation functions are also studied in some detail. It is shown that the thermal noise in the external electromagnetic field seriously affects the second-order correlation function of the supercurrent. © 1996 The American Physical Society.