Dissipative squeezed vacuum in non-equilibrium thermo field dynamics |
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| Authors: | Kyo Yoshida Tsuyoshi Hayashi Sachiko Kitajima |
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| Affiliation: | a Graduate School of Pure and Applied Sciences, University of Tsukuba, Ibaraki 305-8571, Japan
b Graduate School of Humanities and Sciences, Ochanomizu University, Tokyo 112-8610, Japan |
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| Abstract: | Degenerate parametric amplification accompanied by dissipation is analyzed within the canonical operator formalism for quantum dissipative systems named non-equilibrium thermo field dynamics. The vacuum of the system is subject to both dissipation and breaking of phase symmetry due to squeezing. The annihilation-creation operators for the vacuum are derived and the structure of the vacuum is examined. The effects of dissipation on squeezing and uncertainty relation are estimated. |
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| Keywords: | Non-equilibrium thermo field dynamics Dissipative quantum systems Dissipative squeezed vacuum Quantum optics |
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