title: Relativistic constraints on the distinguishability of orthogonal quantum states
abstract: 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
keyphrases: relativistic constraints orthogonal quantum states special relativity orthogonal single-photon states observer time interval nonrelativistic quantum information theory quantum communication channels quantum-state distinguishability