Thermalization through unitary evolution of pure states
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...
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Veröffentlicht in: | Europhysics letters 2006-12, Vol.76 (6), p.1179-1185 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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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ISSN: | 0295-5075 1286-4854 |
DOI: | 10.1209/epl/i2006-10388-9 |