J4 ›› 2017, Vol. 34 ›› Issue (1): 46-53.

• Quantum Optics • Previous Articles     Next Articles

Measurement-device-independent quantum key distribution based on wavelength division multiplexing technology

MAO Qianping1,2, ZHAO Shengmei1,3, WANG Le1, QIAN Chenchen1, CHEN Hanwu4   

  1. 1 Institute of Signal Processing and Transmission,Nanjing University of Posts and Telecommunications, Nanjing 210003, China; 2 College of Computer Science and Technology,Nanjing Tech University, Nanjing 210009, China; 3 Key Laboratory of Broadband Wireless Communication and Sensor Network Technology, Nanjing University of Posts and Telecommunications, Ministry of Education, Nanjing 210003, China; 4 School of Computer Science and Engineering, Southeast University, Nanjing 210096, China
  • Received:2015-12-22 Revised:2016-05-30 Published:2017-01-28 Online:2017-01-28

Abstract: Based on the decoy state MDI-QKD protocol, a MDI-QKD protocol using wavelength division multiplexing (WDM) technique is proposed. Both sides of communications, Alice and Bob, transmit multiple-channel signals with different wavelengths at the same time. The multi-channel signals are merged with optical multiplexer, and then a single fiber is adopted for long distance transmission. The third party, Charlie, separates the multi-channel synthetic signal with optical demultiplexer, and Bell-state measurement is performed for each sub-channel signal. Theoretical analysis results show that the key generation rate relates to the transmission distance, number of multiplexing and mean photon numbers. Numerical simulation results show that the proposed protocol greatly improves the system key generation rate. When the transmission distance is 150 km, the single-channel key generation rate is 0.17 Mbps. The key generation rates with 20 channels, 40 channels multiplexing are 3.34 Mbps, 6.68 Mbps.

Key words: quantum optics; key generation rate; wavelength division multiplexing; measurement-device-independent quantum key distribution

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