Entanglement and elementary excitations in quantum spin chain

The entanglement induced by elementary excitations in the XX spin chain is investigated by Bethe ansatz method. The reduced density matrix and correlation function between any pair of spins can be obtained for ground and all excited states with N qubits. Rely on them we show the explicit and general...

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Veröffentlicht in:	Physica. B, Condensed matter Condensed matter, 2011-05, Vol.406 (11), p.2308-2313
Hauptverfasser:	Li, Bo, Shen Wang, Yan
Format:	Artikel
Sprache:	eng
Schlagworte:	Bethe eigenstates Chains Condensed matter Condensed matter: electronic structure, electrical, magnetic, and optical properties Correlation functions Density Elementary excitations Entanglement Exact sciences and technology General theory and models of magnetic ordering Grounds Magnetic properties and materials Mathematical models Physics Qubits (quantum computing) Spin chain Spin chain models
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Zusammenfassung:	The entanglement induced by elementary excitations in the XX spin chain is investigated by Bethe ansatz method. The reduced density matrix and correlation function between any pair of spins can be obtained for ground and all excited states with N qubits. Rely on them we show the explicit and general relations between entanglement and elementary excitations in XX spin chain. We further show our method can be extend to other integrable models.
ISSN:	0921-4526 1873-2135
DOI:	10.1016/j.physb.2011.03.066