A Real-Time QKD System Based on FPGA

A real-time quantum key distribution (QKD) system is developed in this paper. In the system, based on the feature of a field-programmable gate array, secure key extraction control and algorithm have been optimally designed to perform sifting, error correction, and privacy amplification altogether in real time. In the QKD experiment, information synchronization mechanism and high-speed classic data channel are designed to ensure the steady operation of the system. Decoy state and synchronous laser light source are used in the system, while the length of optical fiber between Alice and Bob is 20 km. With photons repetition frequency of 20 MHz, the final key rate could reach 17 kb/s. Smooth and robust operation is verified with 6 h continuous test and associated with encrypted voice communication test.

[1]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[2]  Gilles Brassard,et al.  Experimental Quantum Cryptography , 1990, EUROCRYPT.

[3]  Ekert,et al.  Quantum cryptography based on Bell's theorem. , 1991, Physical review letters.

[4]  Charles H. Bennett,et al.  Quantum cryptography using any two nonorthogonal states. , 1992, Physical review letters.

[5]  Gilles Brassard,et al.  Secret-Key Reconciliation by Public Discussion , 1994, EUROCRYPT.

[6]  Hugo Krawczyk,et al.  LFSR-based Hashing and Authentication , 1994, CRYPTO.

[7]  Generalized privacy amplification , 1994, Proceedings of 1994 IEEE International Symposium on Information Theory.

[8]  S. N. Molotkov,et al.  Quantum cryptography based on quantum dots , 1996 .

[9]  Shor,et al.  Simple proof of security of the BB84 quantum key distribution protocol , 2000, Physical review letters.

[10]  H. Bechmann-Pasquinucci,et al.  Quantum cryptography , 2001, quant-ph/0101098.

[11]  C. G. Peterson,et al.  Fast, efficient error reconciliation for quantum cryptography , 2002, quant-ph/0203096.

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

[13]  Charles H. Bennett,et al.  Experimental quantum cryptography , 1991, Journal of Cryptology.

[14]  Xiang-Bin Wang.  A decoy-state protocol for quantum cryptography with 4 intensities of coherent states , 2008 .

[15]  Xiongfeng Ma,et al.  Decoy state quantum key distribution. , 2004, Physical review letters.

[16]  Hao Liang,et al.  FPGA and USB based control board for quantum random number generator , 2009 .

[17]  Kai Chen,et al.  Field test of a practical secure communication network with decoy-state quantum cryptography. , 2008, Optics express.

[18]  Kai Chen,et al.  Metropolitan all-pass and inter-city quantum communication network. , 2010, Optics express.

[19]  Jin Ge.  Development of a high speed true random number generator based on jitter , 2011 .

[20]  Wang Jian.  Design of high-precision synchronization in quantum key distribution system , 2011 .

[21]  W. Marsden.  I and J , 2012 .

[22]  J. Mixter.  Fast , 2012 .

[23]  Jian Wang,et al.  A Real-Time Design Based on FPGA for Expeditious Error Reconciliation in QKD System , 2013, IEEE Transactions on Information Forensics and Security.

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