| Improving the fidelity of continuous-variable quantum teleportation by tuning displacement gain |
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| 作者姓名： | 刘金明 李剑 郭光灿 |
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| 作者单位： | Key Laboratory of Quantum Information，University of Science and Technology of China，Chinese Academy of Sciences，Hefei 230026，Key Laboratory of Quantum Information，University of Science and Technology of China，Chinese Academy of Sciences，Hefei 230026，Key Laboratory of Quantum Information，University of Science and Technology of China，Chinese Academy of Sciences，Hefei 230026 Laboratory for Quantum Optics，Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800 |
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| 基金项目： | This project was supported by the National Fundamental Research Program (2001CB309300)，the Innovation Funds from Chinese Academy of Sciences. |
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| 摘 要： | The fidelity of teleportation of continuous quantum variables can be improved by tuning the local displacement gain. We investigate the optimization of the fidelity for the teleportation of Schrodinger cat states, and of coherent states. It is found that the gain corresponding to the maximum fidelity is not equal to one for the two input states in the case of the small squeezing degree of the entanglement resource, while unity displacement gain is the best choice for teleporting arbitrary quantum states in the case of large squeezing.
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Improving the fidelity of continuous-variable quantum teleportation by tuning displacement gain |
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| Abstract: | The fidelity of teleportation of continuous quantum variables can be improved by tuning the local displace-ment gain. We investigate the optimization of the fidelity for the teleportation of Schrodinger cat states,and of coherent states. It is found that the gain corresponding to the maximum fidelity is not equal to onefor the two input states in the case of the small squeezing degree of the entanglement resource, while unitydisplacement gain is the best choice for teleporting arbitrary quantum states in the case of large squeezing. |
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