Random qubit-states and how best to measure them

S.M. Barnett

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
107 Downloads (Pure)


We consider the problem of measuring a single qubit, known to have been prepared in either a randomly selected pure state or a randomly selected real pure state. We seek the measurements that provide either the best estimate of the state prepared or maximise the accessible information. Surprisingly, any sensible measurement turns out to be optimal. We discuss the application of these ideas to multiple qubits and higher-dimensional systems.
Original languageEnglish
Pages (from-to)232-238
Number of pages7
JournalJournal of Modern Optics
Issue number3
Publication statusPublished - Jan 2010


  • quantum measurement
  • quantum information


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