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Steered coherence and entanglement in the Heisenberg XX chain under twisted boundary conditions |
| Yu-Hang Sun(孙宇航) and Yu-Xia Xie(谢玉霞)† |
| School of Science, Xi'an University of Posts and Telecommunications, Xi'an 710121, China |
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Abstract We study steered coherence (SC) and entanglement in a three-spin Heisenberg XX model under twisted boundary conditions and show that their strengths can be significantly enhanced by tuning the twist angle. The optimal twist angle θopt for achieving the maximum l1 norm of SC is π in the region of weak field B and decreases gradually from π to 0 when B increases after a critical value, while for the relative entropy of SC, θopt equals π in the weak field region and 0 otherwise. The entanglement and the critical temperature above which the entanglement vanishes can also be significantly enhanced by tuning the twist angle from 0 to π.
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Received: 31 October 2020
Revised: 08 January 2021
Accepted manuscript online: 01 February 2021
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PACS:
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03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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64.70.Tg
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(Quantum phase transitions)
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75.10.Pq
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(Spin chain models)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11675129). |
Corresponding Authors:
Yu-Xia Xie
E-mail: yuxia1124@163.com
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Cite this article:
Yu-Hang Sun(孙宇航) and Yu-Xia Xie(谢玉霞) Steered coherence and entanglement in the Heisenberg XX chain under twisted boundary conditions 2021 Chin. Phys. B 30 070303
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