document: Relativistic constraints on the distinguishability of orthogonal quantum states The constraints imposed by special relativity on the distinguishability of quantum states are discussed . An explicit expression relating the probability of an error in distinguishing two orthogonal single-photon states to their structure , the time t at which a measurement starts , and the interval of time T elapsed from the start of the measurement until the time at which the outcome is obtained by an observer is given as an example
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