Ultra-high bandwidth quantum secured data transmission

Quantum key distribution (QKD) provides an attractive means for securing communications in optical fibre networks. However, deployment of the technology has been hampered by the frequent need for dedicated dark fibres to segregate the very weak quantum signals from conventional traffic. Up until now the coexistence of QKD with data has been limited to bandwidths that are orders of magnitude below those commonly employed in fibre optic communication networks. Using an optimised wavelength divisional multiplexing scheme, we transport QKD and the prevalent 100 Gb/s data format in the forward direction over the same fibre for the first time. We show a full quantum encryption system operating with a bandwidth of 200 Gb/s over a 100 km fibre. Exploring the ultimate limits of the technology by experimental measurements of the Raman noise, we demonstrate it is feasible to combine QKD with 10 Tb/s of data over a 50 km link. These results suggest it will be possible to integrate QKD and other quantum photonic technologies into high bandwidth data communication infrastructures, thereby allowing their widespread deployment.

[1]  J. F. Dynes,et al.  Evolution of locally excited avalanches in semiconductors , 2010, 1003.0919.

[2]  Kumar N. Sivarajan,et al.  Optical Networks: A Practical Perspective, 3rd Edition , 2009 .

[3]  James F. Dynes,et al.  Quantum secured gigabit optical access networks , 2015, Scientific reports.

[4]  J. F. Dynes,et al.  Room temperature single-photon detectors for high bit rate quantum key distribution , 2014 .

[5]  Toshimori Honjo,et al.  Quantum key distribution over a 72 dB channel loss using ultralow dark count superconducting single-photon detectors , 2014, Optics letters.

[6]  F. Huijskens,et al.  Ultra-high-density spatial division multiplexing with a few-mode multicore fibre , 2014, Nature Photonics.

[7]  A R Dixon,et al.  Efficient decoy-state quantum key distribution with quantified security. , 2013, Optics express.

[8]  Peng Huang,et al.  Continuous-variable quantum key distribution with 1 Mbps secure key rate. , 2015, Optics express.

[9]  Richard J. Hughes,et al.  Dense wavelength multiplexing of 1550 nm QKD with strong classical channels in reconfigurable networking environments , 2009 .

[10]  Gilles Brassard,et al.  Quantum Cryptography , 2005, Encyclopedia of Cryptography and Security.

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

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

[13]  Xiang Liu,et al.  Differential phase-shift keying for high spectral efficiency optical transmissions , 2004, IEEE Journal of Selected Topics in Quantum Electronics.

[14]  Masahiko Jinno,et al.  Elastic optical networking: a new dawn for the optical layer? , 2012, IEEE Communications Magazine.

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

[16]  Michael Eiselt,et al.  WDM transport towards Terabits/s line rates - what will be gained? , 2011 .

[17]  Kathy P. Wheeler,et al.  Reviews of Modern Physics , 2013 .

[18]  N. Wada,et al.  2.15 Pb/s transmission using a 22 core homogeneous single-mode multi-core fiber and wideband optical comb , 2015, 2015 European Conference on Optical Communication (ECOC).

[19]  A. W. Sharpe,et al.  High speed single photon detection in the near-infrared , 2007, 0707.4307.

[20]  L. Nelson,et al.  Space-division multiplexing in optical fibres , 2013, Nature Photonics.

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

[22]  Rob Thew,et al.  Provably secure and practical quantum key distribution over 307 km of optical fibre , 2014, Nature Photonics.

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