| Quantum Cryptography in Spin Networks |
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| 作者姓名： | 邓洪亮 方细明 |
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| 作者单位： | Key Laboratory of Quantum Structure and Quantum Control of Ministry of education and Department of Physics, Hunan Normal University; Ghangsha 410081 |
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| 基金项目： | Supported by the National Science Foundation under Grant No 2007CB925204. |
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| 摘 要： | In this paper we propose a new scheme of long-distance quantum cryptography based on spin networks with qubits stored in electron spins of quantum dots. By＂ conditional Faraday- rotation, single photon polarization measurement, and quantum state transfer, maximal-entangled Bell states for quantum cryptography between two long-distance parties are created. Meanwhile, efficient quantum state transfer over arbitrary＂ distances is obtained in a spin chain by＂ a proper choice of coupling strengths and using spin memory- technique improved. We also analyse the security＂ of the scheme against the cloning-based attack which can be also implemented in spin network and discover that this spin network cloning coincides with the optimal fidelity- achieved by＂ an eavesdropper for entanglement-based cryptography.
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| 关 键 词： | 量子密码 自旋结网圈 圈量子引力 量子学 |
| 收稿时间： | 2007-03-13 |
Quantum Cryptography in Spin Networks |
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| DENG Hong-Liang,FANG Xi-Ming.Quantum Cryptography in Spin Networks[J].Chinese Physics Letters,2007,24(11):3051-3054. |
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| Authors: | DENG Hong-Liang FANG Xi-Ming |
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| Affiliation: | Key Laboratory of Quantum Structure and Quantum Control of Ministry of education and Department of Physics, Hunan Normal University, Changsha 410081 |
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| Abstract: | In this paper we propose a new scheme of long-distance quantum cryptography based on spin networks with qubits stored in electron spins of quantum dots. By conditional Faraday rotation, single photon polarization measurement, and quantum state transfer, maximal-entangled Bell states for quantum cryptography between two long-distance parties are created. Meanwhile, efficient quantum state transfer over arbitrary distances is obtained in a spin chain by a proper choice of coupling strengths and using spin memory technique improved. We also analyse the security of the schemeagainst the cloning-based attack which can be also implemented in spin network and discover that this spin network cloning coincides with the optimal fidelity achieved by an eavesdropper for entanglement-based cryptography. |
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| Keywords: | 03 67 Dd 78 67 Hc 03 67 -a |
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