This article has an erratum: [erratum]
Volume 76, Number 6, December 2006
|Page(s)||1179 - 1185|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||23 November 2006|
Thermalization through unitary evolution of pure states
Department of Physics, Norwegian University of Science and Technology N-7491 Trondheim, Norway
Accepted: 20 October 2006
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.
PACS: 75.10.Pq – Spin chain models / 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) / 65.90.+i – Other topics in thermal properties of condensed matter
© EDP Sciences, 2006
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