High-speed and high-performance polarization-based quantum key distribution system without side channel effects caused by multiple lasers

Side channel effects such as temporal disparity and intensity fluctuation of photon pulses caused by random bit generation with multiple laser diodes in high-speed polarization-based BB84 quantum key distribution (QKD) systems can be eliminated by increasing DC bias current condition. However, background photons caused by the spontaneous emission process under high DC bias current degrade the performance of the QKD systems. In this study, we investigated, for the first time, the effects of spontaneously emitted photons on the system performance in a high-speed QKD system at a clock rate of 400 MHz. Also, we further show improvements of system performance without side channel effects by utilizing temporal filtering technique with real-time FPGA signal processing.

[1]  Akihiro Mizutani,et al.  Finite-key security analysis of quantum key distribution with imperfect light sources , 2015, 1504.08151.

[2]  J. Skaar,et al.  Hacking commercial quantum cryptography systems by tailored bright illumination , 2010, 1008.4593.

[3]  L. Zhang,et al.  Direct and full-scale experimental verifications towards ground–satellite quantum key distribution , 2012, 1210.7556.

[4]  H. Weinfurter,et al.  Experimental Demonstration of Free-Space Decoy-State Quantum Key Distribution over 144 km , 2007, 2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference.

[5]  Won-Young Hwang.  Quantum key distribution with high loss: toward global secure communication. , 2003, Physical review letters.

[6]  Kazuhisa Ogawa,et al.  Intensity fluctuation of a gain-switched semiconductor laser for quantum key distribution systems. , 2017, Optics express.

[7]  H. Lo,et al.  Practical Decoy State for Quantum Key Distribution , 2005, quant-ph/0503005.

[8]  Sanders,et al.  Limitations on practical quantum cryptography , 2000, Physical review letters.

[9]  Jian-Wei Pan,et al.  General theory of decoy-state quantum cryptography with source errors , 2006, quant-ph/0612121.

[10]  June-Koo Kevin Rhee,et al.  Informatic analysis for hidden pulse attack exploiting spectral characteristics of optics in plug-and-play quantum key distribution system , 2016, Quantum Inf. Process..

[11]  Gilles Brassard,et al.  Quantum cryptography: Public key distribution and coin tossing , 2014, Theor. Comput. Sci..

[12]  Dong He,et al.  Satellite-based entanglement distribution over 1200 kilometers , 2017, Science.

[13]  Yang Li,et al.  Long-distance free-space quantum key distribution in daylight towards inter-satellite communication , 2017, Nature Photonics.

[14]  Joong-Seon Choe,et al.  Critical side channel effects in random bit generation with multiple semiconductor lasers in a polarization-based quantum key distribution system. , 2017, Optics express.

[15]  Yongmei Huang,et al.  Satellite-to-ground quantum key distribution , 2017, Nature.

[16]  H. Weinfurter,et al.  Air-to-ground quantum communication , 2013, Nature Photonics.

[17]  H. Weinfurter,et al.  Information leakage via side channels in freespace BB84 quantum cryptography , 2009 .

[18]  M. Hayashi,et al.  Security analysis of the decoy method with the Bennett–Brassard 1984 protocol for finite key lengths , 2013, 1302.4139.

[19]  Miloslav Dusek,et al.  Unambiguous state discrimination in quantum cryptography with weak coherent states , 2000 .

[20]  Sellami Ali,et al.  DECOY STATE QUANTUM KEY DISTRIBUTION , 2010 .