Entanglement and elementary excitations in quantum spin chain |
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| Authors: | Bo Li Yan Shen Wang |
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| Affiliation: | MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Department of Applied Physics, Xi’an Jiaotong University, Xi’an 710049, People''s Republic of China |
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| Abstract: | 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. |
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| Keywords: | Spin chain Entanglement Bethe eigenstates Correlation functions Elementary excitations |
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