Generalization of quantum-state comparison

  title={Generalization of quantum-state comparison},
  author={Matthias Kleinmann and Hermann Kampermann and Dagmar Bru{\ss}},
  • Matthias Kleinmann, Hermann Kampermann, Dagmar Bruß
  • Published 2005
  • Mathematics, Physics
  • We investigate the unambiguous comparison of quantum states in a scenario that is more general than the one that was originally suggested by Barnett et al. First, we find the optimal solution for the comparison of two states taken from a set of two pure states with arbitrary a priori probabilities. We show that the optimal coherent measurement is always superior to the optimal incoherent measurement. Second, we develop a strategy for the comparison of two states from a set of N pure states, and… CONTINUE READING


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