| http://www.w3.org/ns/prov#value | - signal from the receiver, the network including a looped-back path for returning at least some of the single-photon signals output by the transmitter to the transmitter, and the transmitter including a single-photon detector arranged to detect the returned single-photon signal, in use the transmitter comparing the states of the single-photon signals as transmitted and returned. 18.
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