Control-free control: Manipulating a quantum system using only a limited set of measurements

S. Ashhab, Franco Nori

Research output: Contribution to journalArticle

39 Citations (Scopus)


We present and discuss different protocols for preparing an arbitrary quantum state of a qubit using only a restricted set of measurements, with no unitary operations at all. We show that an arbitrary state can indeed be prepared, provided that the available measurements satisfy certain requirements. Our results shed light on the role that measurement-induced back-action plays in quantum feedback control and the extent to which this back-action can be exploited in quantum-control protocols.

Original languageEnglish
Article number062103
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number6
Publication statusPublished - 6 Dec 2010


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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