This article has an erratum: [erratum]

Issue
Europhys. Lett.
Volume 76, Number 6, December 2006
Page(s) 1179 - 1185
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI http://dx.doi.org/10.1209/epl/i2006-10388-9
Published online 23 November 2006
Europhys. Lett., 76 (6), pp. 1179-1185 (2006)
DOI: 10.1209/epl/i2006-10388-9

Thermalization through unitary evolution of pure states

S. O. Skrovseth

Department of Physics, Norwegian University of Science and Technology N-7491 Trondheim, Norway


received 26 June 2006; accepted in final form 20 October 2006
published online 23 November 2006

Abstract
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.

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