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Quantum Cryptography in Spin Networks |
| DENG Hong-Liang;FANG Xi-Ming |
| 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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| Cite this article: |
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DENG Hong-Liang, FANG Xi-Ming 2007 Chin. Phys. Lett. 24 3051-3054 |
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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 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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| Keywords:
03.67.Dd
78.67.Hc
03.67.-a
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Received: 13 March 2007
Published: 23 October 2007
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