All entangled states are useful for channel discrimination

Marco Piani, John Watrous

Research output: Contribution to journalArticlepeer-review

106 Citations (Scopus)


We prove that every entangled state is useful as a resource for the problem of minimum-error channel discrimination. More specifically, given a single copy of an arbitrary bipartite entangled state, it holds that there is an instance of a quantum channel discrimination task for which this state allows for a correct discrimination with strictly higher probability than every separable state.
Original languageEnglish
Article number250501
Number of pages4
JournalPhysical Review Letters
Issue number25
Publication statusPublished - 26 Jun 2009


  • minimum-error
  • channel discrimination
  • entangled state


Dive into the research topics of 'All entangled states are useful for channel discrimination'. Together they form a unique fingerprint.

Cite this