An authorized user receiving bunched photon states from the output of a hyper-entangled photon server can make use on average of one fourth of the total transmitted events to gain situational awareness of the communications channel. Another user receiving bunched states can do the same. Both users then gain greater situational awareness on the confidentiality and integrity of the remaining half of the total transmission events wherein they both perform non-local correlated measurements on anti-bunched photon states. Keyed communication in quantum noise1 (KCQ) is used to enhance confidentiality and efficiency. This depiction forms a baseline for more realistic models; all optical elements are perfect and propagation through channels is noiseless.
David H. Hughes and Reinhard K. Erdmann, "Non-local correlations in a hyper-entangled circuit," Proc. SPIE 10118, Advances in Photonics of Quantum Computing, Memory, and Communication X, 101180J (Presented at SPIE OPTO: February 02, 2017; Published: 20 February 2017); https://doi.org/10.1117/12.2248917.
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