Chin. Phys. Lett.  2011, Vol. 28 Issue (7): 070307    DOI: 10.1088/0256-307X/28/7/070307
GENERAL |
Efficient Phase-Encoding Quantum Key Generation with Narrow-Band Single Photons
YAN Hui1,2**, ZHU Shi-Liang1, DU Sheng-Wang2
1Laboratory of Quantum Information Technology, ICMP and SPTE, South China Normal University, Guangzhou 510006
2Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
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YAN Hui, ZHU Shi-Liang, DU Sheng-Wang 2011 Chin. Phys. Lett. 28 070307
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Abstract We propose an efficient phase-encoding quantum secret key generation scheme with heralded narrow-band single photons. The key information is carried by the phase modulation directly on the single-photon temporal waveform. We show that when the technique is applied to the conventional single photon phase-encoding BB84 and differential phase shift (DPS) quantum key distribution schemes, the key generation efficiencies can be improved by factors of 2 and 3, respectively. For N(≥3)−period DPS systems, the key generation efficiency can be improved by a factor of N. The technique is suitable for quantum-memory-based long-distance fiber communication systems.
Keywords: 03.67.Dd      42.50.Dv      03.67.Hk     
Received: 17 February 2011      Published: 29 June 2011
PACS:  03.67.Dd (Quantum cryptography and communication security)  
  42.50.Dv (Quantum state engineering and measurements)  
  03.67.Hk (Quantum communication)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/28/7/070307       OR      https://cpl.iphy.ac.cn/Y2011/V28/I7/070307
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YAN Hui
ZHU Shi-Liang
DU Sheng-Wang
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