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- W2049664538 abstract "Given a multilevel system coupled to a bath, we use a Feshbach $P$, $Q$ partitioning technique to derive an exact trace-nonpreserving master equation for a subspace ${mathcal{S}}_{i}$ of the system. The resultant equation properly treats the leakage effect from ${mathcal{S}}_{i}$ into the remainder of the system space. Focusing on a second-order approximation, we show that a one-dimensional master equation is sufficient to study problems of quantum state storage and is a good approximation, or exact, for several analytical models. It allows a natural definition of a leakage function and its control and provides a general approach to study and control decoherence and leakage. Numerical calculations on an harmonic oscillator coupled to a room temperature harmonic bath show that the leakage can be suppressed by the pulse control technique without requiring ideal pulses." @default.
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- W2049664538 date "2009-02-27" @default.
- W2049664538 modified "2023-09-26" @default.
- W2049664538 title "Master Equation and Control of an Open Quantum System with Leakage" @default.
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- W2049664538 doi "https://doi.org/10.1103/physrevlett.102.080405" @default.
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