Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1993-10-12
Physics
High Energy Physics
High Energy Physics - Theory
17 pages,plain TEX, FT-389-1993
Scientific paper
Time evolution of the expectation values of various dynamical operators of the harmonic oscillator with dissipation is analitically obtained within the framework of the Lindblad's theory for open quantum systems. We deduce the density matrix of the damped harmonic oscillator from the solution of the Fokker-Planck equation for the coherent state representation, obtained from the master equation for the density operator. The Fokker-Planck equation for the Wigner distribution function is also solved by using the Wang-Uhlenbeck method of transforming it into a linearized partial differential equation for the Wigner function, subject to either the Gaussian type or the $\delta$-function type of initial conditions. The Wigner functions which we obtain are two-dimensional Gaussians with different widths.
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