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- W3104269555 abstract "We review the continuous monitoring of a qubit through its spontaneous emission, at an introductory level. Contemporary experiments have been able to collect the fluorescence of an artificial atom in a cavity and transmission line, and then make measurements of that emission to obtain diffusive quantum trajectories in the qubit's state. We give a straightforward theoretical overview of such scenarios, using a framework based on Kraus operators derived from a Bayesian update concept; we apply this flexible framework across common types of measurements including photodetection, homodyne, and heterodyne monitoring, and illustrate its equivalence to the stochastic master equation formalism throughout. Special emphasis is given to homodyne (phase-sensitive) monitoring of fluorescence. The examples we develop are used to illustrate basic methods in quantum trajectories, but also to introduce some more advanced topics of contemporary interest, including the arrow of time in quantum measurement, and trajectories following optimal measurement records derived from a variational principle. The derivations we perform lead directly from the development of a simple model to an understanding of recent experimental results." @default.
- W3104269555 created "2020-11-23" @default.
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- W3104269555 date "2020-01-02" @default.
- W3104269555 modified "2023-10-10" @default.
- W3104269555 title "Measuring fluorescence to track a quantum emitter's state: a theory review" @default.
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- W3104269555 doi "https://doi.org/10.1080/00107514.2020.1747201" @default.
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