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Electronics 2018, 7(4), 49; https://doi.org/10.3390/electronics7040049

Quantification of the Impact of Photon Distinguishability on Measurement-Device- Independent Quantum Key Distribution

1
Department of Physics and Nuclear Engineering, United States Military Academy, West Point, NY 10996, USA
2
Department of Systems Engineering, Center for Cyberspace Research, Air Force Institute of Technology, Wright-Patterson Air Force Base, OH 45433, USA
*
Author to whom correspondence should be addressed.
Received: 11 March 2018 / Revised: 30 March 2018 / Accepted: 2 April 2018 / Published: 5 April 2018
(This article belongs to the Special Issue Quantum Communications Systems)
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Abstract

Measurement-Device-Independent Quantum Key Distribution (MDI-QKD) is a two-photon protocol devised to eliminate eavesdropping attacks that interrogate or control the detector in realized quantum key distribution systems. In MDI-QKD, the measurements are carried out by an untrusted third party, and the measurement results are announced openly. Knowledge or control of the measurement results gives the third party no information about the secret key. Error-free implementation of the MDI-QKD protocol requires the crypto-communicating parties, Alice and Bob, to independently prepare and transmit single photons that are physically indistinguishable, with the possible exception of their polarization states. In this paper, we apply the formalism of quantum optics and Monte Carlo simulations to quantify the impact of small errors in wavelength, bandwidth, polarization and timing between Alice’s photons and Bob’s photons on the MDI-QKD quantum bit error rate (QBER). Using published single-photon source characteristics from two-photon interference experiments as a test case, our simulations predict that the finite tolerances of these sources contribute ( 4.04 ± 20 / N sifted ) % to the QBER in an MDI-QKD implementation generating an N sifted -bit sifted key. View Full-Text
Keywords: measurement-device-independent quantum key distribution; quantum optics; two-photon interference measurement-device-independent quantum key distribution; quantum optics; two-photon interference
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Simon, G.K.; Huff, B.K.; Meier, W.M.; Mailloux, L.O.; Harrell, L.E. Quantification of the Impact of Photon Distinguishability on Measurement-Device- Independent Quantum Key Distribution. Electronics 2018, 7, 49.

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