Quantum state comparison and the universal-NOT operation

Stephen M. Barnett

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)
180 Downloads (Pure)


We show that the form of the optimal universal-NOT operation for a single qubit can be determined by considering quantum-limited state comparison. Similarly, optimal state comparison can be derived from the properties of the universal-NOT. This points to the possibility of a fundamental link between these processes.
Original languageEnglish
Pages (from-to)227-231
Number of pages5
JournalJournal of Modern Optics
Issue number3
Publication statusPublished - 10 Feb 2010


  • quantum information
  • quantum operations
  • entanglement

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