Perspectives and limitations of QKD integration in metropolitan area networks.

Quantum key distribution (QKD) systems have already reached a reasonable level of maturity. However, a smooth integration and a wide adoption of commercial QKD systems in metropolitan area networks has still remained challenging because of technical and economical obstacles. Mainly the need for dedicated fibers and the strong dependence of the secret key rate on both loss budget and background noise in the quantum channel hinder a practical, flexible and robust implementation of QKD in current and next-generation optical metro networks. In this paper, we discuss these obstacles and present approaches to share existing fiber infrastructures among quantum and classical channels. Particularly, a proposal for a smooth integration of QKD in optical metro networks, which implies removing spurious background photons caused by optical transmitters, amplifiers and nonlinear effects in fibers, is presented and discussed. We determine and characterize impairments on quantum channels caused by many classical telecom channels at practically used power levels coexisting within the same fiber. Extensive experimental results are presented and indicate that a practical integration of QKD in conventional optical metro networks is possible.

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

[2]  Florian Hipp,et al.  Impairment evaluation toward QKD integration in a conventional 20-channel metro network , 2015, 2015 Optical Fiber Communications Conference and Exhibition (OFC).

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

[4]  Florian Hipp,et al.  Towards a smooth integration of quantum key distribution in metro networks , 2014, 2014 16th International Conference on Transparent Optical Networks (ICTON).

[5]  Guilherme P. Temporao,et al.  Impact of Raman Scattered Noise from Multiple Telecom Channels on Fiber-Optic Quantum Key Distribution Systems , 2014, Journal of Lightwave Technology.

[6]  N. R. Newbury,et al.  Pump-wavelength dependence of Raman gain in single-mode optical fibers , 2003 .

[7]  Florian Hipp,et al.  Distribution of quantum keys in optically transparent networks: Perspectives, limitations and challenges , 2013, 2013 15th International Conference on Transparent Optical Networks (ICTON).

[8]  P. Townsend Simultaneous quantum cryptographic key distribution and conventional data transmission over installed fibre using wavelength-division multiplexing , 1997 .

[9]  Nicolas Gisin,et al.  Quantum key distribution and 1 Gbps data encryption over a single fibre , 2009, 0912.1798.

[10]  A. W. Sharpe,et al.  Coexistence of High-Bit-Rate Quantum Key Distribution and Data on Optical Fiber , 2012, 1212.0033.

[11]  Kai Chen,et al.  Experimental multiplexing of quantum key distribution with classical optical communication , 2015 .

[12]  Richard J. Hughes,et al.  Optical networking for quantum key distribution and quantum communications , 2009 .

[13]  Cyrus D. Cantrell,et al.  Multiple-vibrational-mode model for fiber-optic Raman gain spectrum and response function , 2002 .

[14]  Florian Hipp,et al.  Quantum key distribution over optical access networks , 2013, Proceedings of the 2013 18th European Conference on Network and Optical Communications & 2013 8th Conference on Optical Cabling and Infrastructure (NOC-OC&I).

[15]  F. D. M. Haldane,et al.  The hierarchical structure in the orbital entanglement spectrum of fractional quantum Hall systems , 2011, 1105.5907.

[16]  James F. Dynes,et al.  A quantum access network , 2013, Nature.

[17]  Paul D. Townsend,et al.  Quantum information to the home , 2011, 2011 37th European Conference and Exhibition on Optical Communication.

[18]  Nicholas A. Peters,et al.  Progress toward quantum communications networks: opportunities and challenges , 2007, SPIE OPTO.

[19]  Florian Hipp,et al.  Integration of Quantum Key Distribution in Metropolitan Area Networks , 2014 .

[20]  R. Penty,et al.  Quantum key distribution for 10 Gb/s dense wavelength division multiplexing networks , 2014, 1402.1508.