Stabilization of Stochastic Quantum Dynamics via Open and Closed Loop Control

Details Stabilization of Stochastic Quantum Dynamics via Open and Closed Loop Control Stabilization of Stochastic Quantum Dynamics via Open and Closed Loop Control

2011-10-05

arxiv.org/abs/1110.1020v1

Physics

Quantum Physics

Scientific paper

In this paper we investigate parametrization-free solutions of the problem of quantum pure state preparation and subspace stabilization by means of Hamiltonian control, continuous measurement and quantum feedback, in the presence of a Markovian environment. In particular, we show that whenever suitable dissipative effects are induced either by the unmonitored environment or by non Hermitian measurements, there is no need for feedback control to accomplish the task. Constructive necessary and sufficient conditions on the form of the open-loop controller can be provided in this case. When open-loop control is not sufficient, filtering-based feedback control laws steering the evolution towards a target pure state are provided, which generalize those available in the literature.

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