25 January 2017 Long-distance quantum key distribution using concatenated entanglement swapping with practical resources
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Abstract
We explain how to share photons between two distant parties using concatenated entanglement swapping and assess performance according to the two-photon visibility as the figure of merit. From this analysis, we readily see the key generation rate and the quantum bit error rate as figures of merit for this scheme applied to quantum key distribution (QKD). Our model accounts for practical limitations, including higher-order photon pair events, dark counts, detector inefficiency, and photon losses. Our analysis shows that compromises are needed among the runtimes for the experiment, the rate of producing photon pairs, and the choice of detector efficiency. From our quantitative results, we observe that concatenated entanglement swapping enables secure QKD over long distances but at key generation rates that are far too low to be useful for large separations. We find that the key generation rates are close to both the Takeoka–Guha–Wilde and the Pirandola–Laurenza–Ottaviani–Banchi bounds.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Aeysha Khalique, Aeysha Khalique, Barry C. Sanders, Barry C. Sanders, } "Long-distance quantum key distribution using concatenated entanglement swapping with practical resources," Optical Engineering 56(1), 016114 (25 January 2017). https://doi.org/10.1117/1.OE.56.1.016114 . Submission: Received: 20 October 2016; Accepted: 5 January 2017
Received: 20 October 2016; Accepted: 5 January 2017; Published: 25 January 2017
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