Unambiguous discrimination between linearly independent quantum states

A. Chefles

Research output: Contribution to journalArticlepeer-review

323 Citations (Scopus)


The theory of generalised measurements is used to examine the problem of discriminating unambiguously between non-orthogonal pure quantum states. Measurements of this type never give erroneous results, although, in general, there will be a non-zero probability of a result being inconclusive. It is shown that only linearly independent states can be unambiguously discriminated. In addition to examining the general properties of such measurements, we discuss their application to entanglement concentration.
Original languageEnglish
Pages (from-to)339-347
Number of pages8
JournalPhysics Letters A
Issue number6
Publication statusPublished - 16 Mar 1998


  • quantum states
  • quantum
  • physics
  • probability


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