Time evolution of quantum entanglement of an EPR pair in a localized environment
The Einstein–Podolsky–Rosen (EPR) pair of qubits plays a critical role in many quantum protocol applications such as quantum communication and quantum teleportation. Due to interactions with the environment, an EPR pair can lose its entanglement and no longer serve as a useful quantum resource. On t...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2018-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/aabe3d |
| _version_ | 1797750778671136768 |
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| author | Jia Wang Xia-Ji Liu Hui Hu |
| author_facet | Jia Wang Xia-Ji Liu Hui Hu |
| author_sort | Jia Wang |
| collection | DOAJ |
| description | The Einstein–Podolsky–Rosen (EPR) pair of qubits plays a critical role in many quantum protocol applications such as quantum communication and quantum teleportation. Due to interactions with the environment, an EPR pair can lose its entanglement and no longer serve as a useful quantum resource. On the other hand, it has been suggested that introducing disorder into environment might help prevent thermalization and improve the preservation of entanglement. Here, we theoretically investigate the time evolution of quantum entanglement of an EPR pair in a random-field XXZ spin chain model in the Anderson localized (AL) and many-body localized (MBL) phase. We find that the entanglement between qubits decreases and approaches a plateau in the AL phase, but shows a power-law decrease after some critical time determined by the interaction strength in the MBL phase. Our findings shed light on applying AL/MBL to improve quantum information storage, and can be used as a practical indicator to distinguish the AL and MBL phase. |
| first_indexed | 2024-03-12T16:37:49Z |
| format | Article |
| id | doaj.art-c0f7b27378d64d89aca42390951538c7 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:37:49Z |
| publishDate | 2018-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-c0f7b27378d64d89aca42390951538c72023-08-08T14:48:55ZengIOP PublishingNew Journal of Physics1367-26302018-01-0120505301510.1088/1367-2630/aabe3dTime evolution of quantum entanglement of an EPR pair in a localized environmentJia Wang0https://orcid.org/0000-0002-9064-5245Xia-Ji Liu1Hui Hu2Centre for Quantum and Optical Science, Swinburne University of Technology , Melbourne 3122, AustraliaCentre for Quantum and Optical Science, Swinburne University of Technology , Melbourne 3122, AustraliaCentre for Quantum and Optical Science, Swinburne University of Technology , Melbourne 3122, AustraliaThe Einstein–Podolsky–Rosen (EPR) pair of qubits plays a critical role in many quantum protocol applications such as quantum communication and quantum teleportation. Due to interactions with the environment, an EPR pair can lose its entanglement and no longer serve as a useful quantum resource. On the other hand, it has been suggested that introducing disorder into environment might help prevent thermalization and improve the preservation of entanglement. Here, we theoretically investigate the time evolution of quantum entanglement of an EPR pair in a random-field XXZ spin chain model in the Anderson localized (AL) and many-body localized (MBL) phase. We find that the entanglement between qubits decreases and approaches a plateau in the AL phase, but shows a power-law decrease after some critical time determined by the interaction strength in the MBL phase. Our findings shed light on applying AL/MBL to improve quantum information storage, and can be used as a practical indicator to distinguish the AL and MBL phase.https://doi.org/10.1088/1367-2630/aabe3dmany-body localizationentanglementquantum memory |
| spellingShingle | Jia Wang Xia-Ji Liu Hui Hu Time evolution of quantum entanglement of an EPR pair in a localized environment New Journal of Physics many-body localization entanglement quantum memory |
| title | Time evolution of quantum entanglement of an EPR pair in a localized environment |
| title_full | Time evolution of quantum entanglement of an EPR pair in a localized environment |
| title_fullStr | Time evolution of quantum entanglement of an EPR pair in a localized environment |
| title_full_unstemmed | Time evolution of quantum entanglement of an EPR pair in a localized environment |
| title_short | Time evolution of quantum entanglement of an EPR pair in a localized environment |
| title_sort | time evolution of quantum entanglement of an epr pair in a localized environment |
| topic | many-body localization entanglement quantum memory |
| url | https://doi.org/10.1088/1367-2630/aabe3d |
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