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Experimental System for Quantum Cryptography Based on Two Nonorthogonal Photon Polarization States |
| ZHANG Yong;DENG Le;MAO Min;DING Liang-en |
| Laboratory for Quantum Optics, National Education Commission,
Department of Physics, East China Normal University, Shanghai 200062
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| Cite this article: |
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ZHANG Yong, DENG Le, MAO Min et al 1998 Chin. Phys. Lett. 15 238-239 |
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Abstract Quantum cryptography allows the establishing of a highly confidential sequence of random bits between two parties who share no secret information in advance. Its security is guaranteed by the basic laws of quantum mechanics rather than mathematical difficulty. An experimental system based on a novel protocol for quantum cryptography using only two nonorthogonal photon polarization states is implemented. The photon sources are two semiconductor laser diodes operated at 680 nm, their light pulses which are heavily attenuated to far below one photon per pulse are employed to encode the key. Gated single photon detection technique is used to minimize the dark count effect of the photon multiplier tube. Key establishing rate of 40 b/s and error rate of 2.1 % are obtained. Compared with other systems, our system has the simplest experimental setup.
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03.65.Bz
42.50.-p
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Published: 01 April 1998
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