Yoshida, Kyo; Hayashi, Tsuyoshi; Kitajima, Sachiko; … - In: Physica A: Statistical Mechanics and its Applications 389 (2010) 4, pp. 705-722
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....