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Quantum Cryptography with Entangled QuNits |
| ENG Hong-Liang;FANG Xi-Ming |
| Department of Physics, Hunan Normal University, Changsha 410081 |
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| Cite this article: |
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ENG Hong-Liang, FANG Xi-Ming 2005 Chin. Phys. Lett. 22 275-278 |
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Abstract We propose an extension of quantum key distribution based on encoding the key into quNits, i.e. quantum states in an N-dimensional Hilbert space. In our protocol, we adopt asymmetric measurement scheme resulting in an efficiency higher than previous protocols and a generalized Bell inequality [Phys. Rev. Lett.92(2004)130404] is employed to detect the presence of an eavesdropper Eve. We also derive the information gained by a potential eavesdropper Eve applying a cloning-based attack and the maximal error rate which measures the robustness of the protocol. The result shows that the security of our scheme increases with the dimension N.
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| Keywords:
03.67.Dd
03.65.Ud
89.70.+c
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Published: 01 February 2005
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| PACS: |
03.67.Dd
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(Quantum cryptography and communication security)
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03.65.Ud
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(Entanglement and quantum nonlocality)
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89.70.+c
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