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- W2950894932 abstract "We study the impact of many-body effects on the fundamental precision limits in quantum metrology. On the one hand such effects may lead to non-linear Hamiltonians, studied in the field of non-linear quantum metrology, while on the other hand they may result in decoherence processes that cannot be described using single-body noise models. We provide a general reasoning that allows to predict the fundamental scaling of precision in such models as a function of the number of atoms present in the system. Moreover, we describe a computationally efficient approach that allows for a simple derivation of quantitative bounds. We illustrate these general considerations by a detailed analysis of fundamental precision bounds in a paradigmatic atomic interferometry experiment with standard linear Hamiltonian but with both single and two-body losses taken into account---a model which is motivated by the most recent Bose-Einstein Condensate (BEC) magnetometry experiments. Using this example we also highlight the impact of the atom number super-selection rule on the possibility of protecting interferometric protocols against decoherence." @default.
- W2950894932 created "2019-06-27" @default.
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- W2950894932 date "2019-05-30" @default.
- W2950894932 modified "2023-09-29" @default.
- W2950894932 title "Many-body effects in quantum metrology" @default.
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- W2950894932 doi "https://doi.org/10.1088/1367-2630/ab1fc2" @default.
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