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Quantum Key Distribution Based on a Weak-Coupling Cavity QED Regime |
| LI Chun-Yan1,2,3, LI Yan-Song1,2**
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1State Key Laboratory of Low-dimensional Quantum Physics, and Department of Physics, Tsinghua University, Beijing 100084
2Tsinghua National Laboratory for Information Science and Technology, Beijing 100084
3Department of Physics, National University of Defense Technology, Changsha 410073
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| Cite this article: |
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LI Chun-Yan, LI Yan-Song 2011 Chin. Phys. Lett. 28 120306 |
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Abstract We present a quantum key distribution scheme using a weak-coupling cavity QED regime based on quantum dense coding. Hybrid entanglement statesof photons and electrons are used to distribute information. We just need to transmit photons without storing them in the scheme. The electron confined in a quantum dot, which is embedded in a microcavity, is held by one of the legitimate users throughout the whole communication process. Only the polarization of a single photon and spin of electron measurements are applied in this protocol, which are easier to perform than collective-Bell state measurements. Linear optical apparatus, such as a special polarizing beam splitter in a circular basis and single photon operations, make it more flexible to realize under current technology. Its efficiency will approach 100% in the ideal case. The security of the scheme is also discussed.
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| Keywords:
03.67.Hk
03.67.Dd
03.67.Pp
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Received: 04 June 2011
Published: 29 November 2011
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| PACS: |
03.67.Hk
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(Quantum communication)
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03.67.Dd
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(Quantum cryptography and communication security)
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03.67.Pp
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(Quantum error correction and other methods for protection against decoherence)
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