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- W2044171929 abstract "We consider several observers who monitor different parts of the environment of a single quantum system and use their data to deduce its state. We derive a set of conditional stochastic master equations that describe the evolution of the density matrices each observer ascribes to the system under the Markov approximation, and show that this problem can be reduced to the case of a single ``superobserver,'' who has access to all the acquired data. The key problem---consistency of the sets of data acquired by different observers---is then reduced to the probability that a given combination of data sets will be ever detected by the superobserver. The resulting conditional master equations are applied to several physical examples: homodyne detection of phonons in quantum Brownian motion, photodetection and homodyne detection of resonance fluorescence from a two-level atom. We introduce relative purity to quantify the correlations between the information about the system gathered by different observers from their measurements of the environment. We find that observers gain the most information about the state of the system and they agree the most about it when they measure the environment observables with eigenstates most closely correlated with the optimally predictable pointer basis of the system." @default.
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- W2044171929 date "2004-02-20" @default.
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- W2044171929 title "Conditional quantum dynamics with several observers" @default.
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- W2044171929 doi "https://doi.org/10.1103/physreva.69.022109" @default.
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