Improving entanglement of even entangled coherent states via superposition of number-conserving operations
A scheme for improving entanglement is proposed by repeatedly performing number-conserving generalized superposition of products (GSP) operation, i.e., saa†+ta†amwith s2+t2=1,on each modes of even entangled coherent state (EECS). Both Einstein–Podolsky–Rosen (EPR) correlation and concurrence are use...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-04-01
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| Series: | Results in Physics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379722001073 |
| _version_ | 1818315367289716736 |
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| author | Luping Zhang Fang Jia Huan Zhang Wei Ye Ying Xia Liyun Hu Jiehui Huang |
| author_facet | Luping Zhang Fang Jia Huan Zhang Wei Ye Ying Xia Liyun Hu Jiehui Huang |
| author_sort | Luping Zhang |
| collection | DOAJ |
| description | A scheme for improving entanglement is proposed by repeatedly performing number-conserving generalized superposition of products (GSP) operation, i.e., saa†+ta†amwith s2+t2=1,on each modes of even entangled coherent state (EECS). Both Einstein–Podolsky–Rosen (EPR) correlation and concurrence are used as the measures for describing entanglement. It is found that both single-mode and two-mode-symmetric GSP operations can be used for the entanglement improvement. In particular, for the optimal EPR correlation, the GSP-EECS with two-mode-symmetric first-order operations presents a better performance for the entanglement improvement than the cases of high-order GSP operations. Compared to several special non-Gaussian operations, including photon subtraction-then-addition (PSTA) (s=0)and photon-addition-then-subtraction (PATS) (s=1), it is shown that the entanglement of GSP-EECS is always superior to those of both PSTA-EECS and PATS-EECS at a small amplitude level. When the GSP-EECS is used as the entangled resource for teleportation, our optimal teleportation fidelity presents the best performance. |
| first_indexed | 2024-12-13T09:04:24Z |
| format | Article |
| id | doaj.art-9afb1f9e1a31484ba3abd8c1fdca67c6 |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-12-13T09:04:24Z |
| publishDate | 2022-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-9afb1f9e1a31484ba3abd8c1fdca67c62022-12-21T23:53:05ZengElsevierResults in Physics2211-37972022-04-0135105324Improving entanglement of even entangled coherent states via superposition of number-conserving operationsLuping Zhang0Fang Jia1Huan Zhang2Wei Ye3Ying Xia4Liyun Hu5Jiehui Huang6Center for Quantum Science and Technology, Jiangxi Normal University, Nanchang 330022, ChinaCenter for Quantum Science and Technology, Jiangxi Normal University, Nanchang 330022, China; Corresponding authors.School of Physics, Sun Yat-sen University, Guangzhou 510275, ChinaSchool of Computer Science and Engineering, Central South University, Changsha 410083, ChinaSchool of Physics, Sun Yat-sen University, Guangzhou 510275, ChinaCenter for Quantum Science and Technology, Jiangxi Normal University, Nanchang 330022, China; Institute for Military-civilian integration of Jiangxi province, Nanchang 330029, China; Corresponding author at: Center for Quantum Science and Technology, Jiangxi Normal University, Nanchang 330022, China.Center for Quantum Science and Technology, Jiangxi Normal University, Nanchang 330022, China; Corresponding authors.A scheme for improving entanglement is proposed by repeatedly performing number-conserving generalized superposition of products (GSP) operation, i.e., saa†+ta†amwith s2+t2=1,on each modes of even entangled coherent state (EECS). Both Einstein–Podolsky–Rosen (EPR) correlation and concurrence are used as the measures for describing entanglement. It is found that both single-mode and two-mode-symmetric GSP operations can be used for the entanglement improvement. In particular, for the optimal EPR correlation, the GSP-EECS with two-mode-symmetric first-order operations presents a better performance for the entanglement improvement than the cases of high-order GSP operations. Compared to several special non-Gaussian operations, including photon subtraction-then-addition (PSTA) (s=0)and photon-addition-then-subtraction (PATS) (s=1), it is shown that the entanglement of GSP-EECS is always superior to those of both PSTA-EECS and PATS-EECS at a small amplitude level. When the GSP-EECS is used as the entangled resource for teleportation, our optimal teleportation fidelity presents the best performance.http://www.sciencedirect.com/science/article/pii/S2211379722001073Quantum entanglementEntangled coherent statesSuperposition of number-conserving operations |
| spellingShingle | Luping Zhang Fang Jia Huan Zhang Wei Ye Ying Xia Liyun Hu Jiehui Huang Improving entanglement of even entangled coherent states via superposition of number-conserving operations Results in Physics Quantum entanglement Entangled coherent states Superposition of number-conserving operations |
| title | Improving entanglement of even entangled coherent states via superposition of number-conserving operations |
| title_full | Improving entanglement of even entangled coherent states via superposition of number-conserving operations |
| title_fullStr | Improving entanglement of even entangled coherent states via superposition of number-conserving operations |
| title_full_unstemmed | Improving entanglement of even entangled coherent states via superposition of number-conserving operations |
| title_short | Improving entanglement of even entangled coherent states via superposition of number-conserving operations |
| title_sort | improving entanglement of even entangled coherent states via superposition of number conserving operations |
| topic | Quantum entanglement Entangled coherent states Superposition of number-conserving operations |
| url | http://www.sciencedirect.com/science/article/pii/S2211379722001073 |
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