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Testing of the Entangled QKD System EPR S405 Quelle (AIT) in Commercial 1550 nm Fiber Network

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DOI: 10.4236/ijcns.2014.71004    3,102 Downloads   4,231 Views  

ABSTRACT


In this communication, we report results of running tests on standard telecommunication metropolitan network 1550 nm fiber applied to a quantum channel to EPR S405 Quelle prototype systems installed in National Laboratory for Quantum Technologies WUT and in CompSecur Wroclaw. Testing was carried out by means of the original design by us and applied special data card collecting parameters of functioning system allowing for assessment of quality of quantum channel. We have performed several trials using various configurations of standard 1550 nm fiber patch-cord up to length of 6.5 km with additional usage of various patch-cords with weldings and connectors which typically present in already installed commercial metropolitan communication networks. The implementation of this testing indicated that the rigorous maintenance of photon polarization is required for quantum information exchange upon EPR S405 Quelle functioning. The polarization of optical signal turned out to be, however, very unstable for the tested connection which resulted in very rapid QBER rise precluding practical usefulness of this connection for secure quantum exchange of cryptographic key over practically significant distances. We have identified that the main obstacle was the polarization decoherence caused by weldings and connectors in standard patch-cords and accidental strains in fibers as well as generally poor transmitting properties of 1550 nm fiber for much shorter wave-length photons used by the Quelle system. To maintain the quantum channel active, very frequent manual corrections of polarization control were required. So we expect that by design and application of an automatic polarization control module, one would stabilize visibility ratio and lower QBER to an acceptable level conditioning possible future implementation of entangled QKD system in commercial networks.


Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

D. Melniczuk and M. Jacak, "Testing of the Entangled QKD System EPR S405 Quelle (AIT) in Commercial 1550 nm Fiber Network," International Journal of Communications, Network and System Sciences, Vol. 7 No. 1, 2014, pp. 30-36. doi: 10.4236/ijcns.2014.71004.

References

[1] A. Ekert, “Quantum Cryptography Based on Bell’s Theorem,” Physical Review Letters, Vol. 67, 1991, pp. 661-663. http://dx.doi.org/10.1103/PhysRevLett.67.661
[2] D. Enzer, P. Hadley, R. Gughes, C. Peterson and P. Kwiat, “Entangled-Photon Six-State Quantum Cryptography,” New Journal of Physics, Vol. 4, 2002, pp. 45.1-45.8.
[3] J. Pan, C. Simon, C. Brukner and A. Zeilinger, “Entanglement Purification for Quantum Communication,” Nature, Vol. 410, 2001, pp. 1067-1070.
http://dx.doi.org/10.1038/35074041
[4] A. Ekert, J. Rarity, P. Tapster and G. M. Palma, “Practical Quantum Cryptography Based on Two-Photon Interferometry,” Physical Review Letters, Vol. 69, 1992, pp. 1293-1295.
http://dx.doi.org/10.1103/PhysRevLett.69.1293
[5] M. Lindenthal, “Long-Distance Free-Space Quantum Communication with Entangled Photons,” Ph.D. Thesis, Vienna University, Vienna, 2006.
[6] D. C. Burnham and D. L. Weinberg, “Observation of Simultaneity in Parametric Production of Optical Photon Pairs,” Physical Review Letters, Vol. 25, 1970, pp. 84-87.
http://dx.doi.org/10.1103/PhysRevLett.25.84
[7] Austrain Institute of Technology, AIT QKD Software Project Documentation, 2010.
[8] C. H. Bennett and G. Brassard, “Quantum Cryptography: Public Key Distribution and Coin Tossing,” Proceedings of the IEEE International Conference on Computers, Systems, and Signal Processing, Bangalore, 10-12 December 1984, pp. 175-179.
[9] J. S. Bell, “On the Einstein-Podolsky-Rosen Paradox,” Physics, Vol. 1, No. 3, 1964, pp. 195-200.
[10] M. Curty, M. Lewenstein and N. Lutkenhaus, “Entanglement as Precondition for Secure Quantum Key Distribution,” Physical Review Letters, Vol. 92, 2004, Article ID: 217903.
http://dx.doi.org/10.1103/PhysRevLett.92.217903
[11] A. Garg and N. D. Mermin, “Detector Inefficiencies in the Einstein-Podolsky-Rosen Experiment,” Physical Review D, Vol. 35, No. 12, 1987, pp. 3831-3835.
http://dx.doi.org/10.1103/PhysRevD.35.3831

  
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