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Quantum decoherence and the Glauber dynamics from the Stochastic limit | | L. Accardi
; S.V. Kozyrev
; | | Date: |
6 May 2000 | | Subject: | quant-ph | | Abstract: | The effects of decoherence for quantum system coupled with a bosonic field are investigated. An application of the stochastic golden rule shows that in the stochastic limit the dynamics of such a system is described by a quantum stochastic differential equation. The corresponding master equation describes convergence of a system to equilibrium. In particular it predicts exponential damping for off-diagonal matrix elements of the system density matrix, moreover these elements for a generic system will decay at least as exp(-tN{kToverhbar}), where N is a number of particles in the system. As an application of the described technique a derivation from first principles (i.e. starting from a Hamiltonian description) of a quantum extension of the Glauber dynamics for systems of spins is given. | | Source: | arXiv, quant-ph/0005029 | | Services: | Forum | Review | PDF | Favorites | |
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