Fighting Decoherence by Feedback-controlled Dissipation

Details Fighting Decoherence by Feedback-controlled Dissipation Fighting Decoherence by Feedback-controlled Dissipation

2012-03-22

arxiv.org/abs/1203.4977v1

Physics

Quantum Physics

4 pages, 2 figures, comments very welcome

Scientific paper

Repeated closed-loop control operations acting as piecewise-constant Liouville superoperators may effectively be described by a fixed-point iteration for the density matrix. Under appropriate parameter choices, its stationary point corresponds to a pure state, which is achieved by selective dampening of undesired states. We exemplify this for a single qubit, which can be purified by tuning the measurement direction and two qubits that may be purified towards a Bell state by applying a continuous two-local measurement. The method does not require precise knowledge of decoherence channels and works for large reservoir temperatures provided measurement, processing, and control can be implemented in a continuous fashion.

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