ETH Polymer Physics seminar


2011-11-02
10:15 at HCI J 574

Open quantum systems coupled to classical environment with memory

Maksym Osmanov

Polymer Physics, Department of Materials, ETH Zurich

Any realistic quantum systems unavoidably interact with its surrounding environment, which leads to decoherance. Understanding decoherance has fundamental reasons (the measurement problem, the quantum-classical crossover etc.) as well as practical applications (quantum computers, quantum optics, quantum state manipulations). Usually, environment is described as a set of quantum harmonic oscillators and characterizes by its spectral function [1]. There is another point of view, decoherance caused by coupling of quantum systems to classical environment [2]. In this case, evolution of quantum system can be described by nonlinear thermodynamic master equation [3]. Markovian approximation can be done considering quantum system coupled to heat bath, characterized by it entropy and energy. In this talk we will discuss more complex environment with additional classical variables. It will be shown how these changes in environment affect evolution of quantum system.

1. H. P. Breuer and F. Petruccione: The theory of open quantum systems, Clarendon press, Oxford, 2010

2. Öttinger, H.C.: The geometry and thermodynamics of dissipative quantum systems. Europhys. Lett. 94, 10006 (2011)

3. Öttinger, H.C.: Nonlinear thermodynamic quantum master equation: Properties and examples. Phys. Rev. A 82, 052119 (2010)


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