Long-distance quantum key distribution using concatenated entanglement swapping with practical resources

Aeysha Khalique; Barry C. Sanders

doi:10.1117/1.OE.56.1.016114

25 January 2017 Long-distance quantum key distribution using concatenated entanglement swapping with practical resources

Aeysha Khalique, Barry C. Sanders

Author Affiliations +

Funded by: National Science Foundation Physics Frontiers Center, Gordon Betty Moore Foundation

Optical Engineering, Vol. 56, Issue 1, 016114 (January 2017). https://doi.org/10.1117/1.OE.56.1.016114

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.

Citation Download Citation

Aeysha Khalique and 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

Received: 20 October 2016; Accepted: 5 January 2017; Published: 25 January 2017

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