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

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

2010-11-19

arxiv.org/abs/1011.4463v2

Phys. Rev. A 82, 062103 (2010)

Physics

Quantum Physics

6 pages (two-column), 4 figures

Scientific paper

10.1103/PhysRevA.82.062103

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.

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