Thermalisation of Quantum States

Details Thermalisation of Quantum States Thermalisation of Quantum States

1997-11-24

arxiv.org/abs/quant-ph/9711057v2

J.Math.Phys. 40 (1999) 12-18

Physics

Quantum Physics

8 pages, minor corrections. To appear in JMP

Scientific paper

10.1063/1.532757

An exact stochastic model for the thermalisation of quantum states is proposed. The model has various physically appealing properties. The dynamics are characterised by an underlying Schrodinger evolution, together with a nonlinear term driving the system towards an asymptotic equilibrium state and a stochastic term reflecting fluctuations. There are two free parameters, one of which can be identified with the heat bath temperature, while the other determines the characteristic time scale for thermalisation. Exact expressions are derived for the evolutionary dynamics of the system energy, the system entropy, and the associated density operator.

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