Thermalization through unitary evolution of pure states

Details Thermalization through unitary evolution of pure states Thermalization through unitary evolution of pure states

2006-06-26

arxiv.org/abs/quant-ph/0606216v2

Europhys. Lett. 76, 1179 (2006)

Physics

Quantum Physics

8 pages, 7 figures

Scientific paper

10.1209/epl/i2006-10388-9

The unitary time evolution of a critical quantum spin chain with an impurity is calculated, and the entanglement evolution is shown. Moreover, we show that the reduced density matrix of a part of the chain evolves such that the fidelity of its spectrum is very high with respect to a state in thermal equilibrium. Hence, a thermal state occurs through unitary time evolution in a simple spin chain with impurity.

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