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SHAO Bin, ZOU Jian, LI Qian-shu. Zero-Point Energy and Fluctuation in a Field-Josephson Junction-Coupled System[J]. JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY, 2000, 9(2): 142-147.
Citation: SHAO Bin, ZOU Jian, LI Qian-shu. Zero-Point Energy and Fluctuation in a Field-Josephson Junction-Coupled System[J].JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY, 2000, 9(2): 142-147.
shu

Zero-Point Energy and Fluctuation in a Field-Josephson Junction-Coupled System

  • 1.

    Department of Applied Physics, Beijing Institute of Technology, Beijing 100081

  • 2.

    School of Chemical Engineering and Materials Science, Beijing Institute of Technology, Beijing 100081

Funds:NationalNaturalScienceFoundation (29773005)
  • Received Date:1999-11-09
    Abstract
  • To investigate the interaction of a mesoscopic Josephson junction with a single mode quantized electromagnetic field, the diagnonalizing process of the coupled system Hamiltonian was performed by using an unitary transformation. Zero- point energy and zero- point fluctuation of the coupled system were shown. For the ground state of the coupled system, the quantum fluctuations of the flux and charge operators in the field and junction subsystems can exhibit smaller quantum noise than the zero point fluctuations of the individual subsystems. Thus, when the coupled system is in its lowest energy state, which means that no radiation appear, the two subsystems exhibit nonclassical behavior.
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    • References (16)
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