Experimental quantum process discrimination

Anthony Laing, Terry Rudolph, Jeremy L. O'Brien

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)
33 Downloads (Pure)


Discrimination between unknown processes chosen from a finite set is experimentally shown to be possible even in the case of nonorthogonal processes. We demonstrate unambiguous deterministic quantum process discrimination of nonorthogonal processes using properties of entanglement, additional known unitaries, or classical communication. Single qubit measurement and unitary processes and multipartite unitaries (where the unitary acts nonseparably across two distant locations) acting on photons are discriminated with a confidence of 97% in all cases.

Original languageEnglish
Article number160502
JournalPhysical Review Letters
Issue number16
Publication statusPublished - 24 Apr 2009
Externally publishedYes


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