From Event: SPIE Optical Engineering + Applications, 2016
We present our approach for sharing photons and assessing resultant four-photon visibility between two distant parties using concatenated entanglement swapping. In addition we determine the corresponding key generation rate and the quantum bit-error rate. Our model is based on practical limitations of resources, including multipair parametric down-conversion sources, inefficient detectors with dark counts and lossy channels. Through this approach, we have found that a trade-off is needed between experimental run-time, pair-production rate and detector efficiency. Concatenated entanglement swapping enables huge distances for quantum key-distribution but at the expense of low key generation rate.
Aeysha Khalique and Barry C. Sanders, "Long-distance quantum-key-distribution using concatenated entanglement swapping with practical resources," Proc. SPIE 9980, Quantum Communications and Quantum Imaging XIV, 99800R (Presented at SPIE Optical Engineering + Applications: August 30, 2016; Published: 13 September 2016); https://doi.org/10.1117/12.2237870.
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