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- W2079370324 abstract "A brief account of the quantum information dynamics and dynamical programming methods for optimal control of quantum unstable systems is given to both open loop and feedback control schemes corresponding respectively to deterministic and stochastic semi-Markov dynamics of stable or unstable systems. For the quantum feedback control scheme, we exploit the separation theorem of filtering and control aspects as in the usual case of quantum stable systems with non-demolition observation. This allows us to start with the Belavkin quantum filtering equation generalized to demolition observations and derive the generalized Hamilton–Jacobi–Bellman equation using standard arguments of classical control theory. This is equivalent to a Hamilton–Jacobi equation with an extra linear dissipative term if the control is restricted to Hamiltonian terms in the filtering equation. An unstable controlled qubit is considered as an example throughout the development of the formalism. Finally, we discuss optimum observation strategies to obtain a pure quantum qubit state from a mixed one." @default.
- W2079370324 created "2016-06-24" @default.
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- W2079370324 date "2012-11-28" @default.
- W2079370324 modified "2023-09-25" @default.
- W2079370324 title "Quantum demolition filtering and optimal control of unstable systems" @default.
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- W2079370324 doi "https://doi.org/10.1098/rsta.2011.0517" @default.
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