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- W3100306530 abstract "We introduce a Ramsey pulse scheme which extracts the non-Hermitian Hamiltonian associated to an arbitrary Lindblad dynamics. We propose a realted protocol to measure via interferometry a generalised Loschmidt echo of a generic state evolving in time with the non-Hermitian Hamiltonian itself, and we apply the scheme to a one-dimensional weakly interacting Bose gas coupled to a stochastic atomic impurity. The Loschmidt echo is mapped into a functional integral from which we calculate the long-time decohering dynamics at arbitrary impurity strengths. For strong dissipation we uncover the phenomenology of a quantum many-body Zeno effect: corrections to the decoherence exponent resulting from the impurity self-energy becomes purely imaginary, in contrast to the regime of small dissipation where they instead enhance the decay of quantum coherences. Our results illustrate the prospects for experiments employing Ramsey interferometry to study dissipative quantum impurities in condensed matter and cold atoms systems." @default.
- W3100306530 created "2020-11-23" @default.
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- W3100306530 date "2020-07-01" @default.
- W3100306530 modified "2023-10-15" @default.
- W3100306530 title "Ramsey interferometry of non-Hermitian quantum impurities" @default.
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- W3100306530 doi "https://doi.org/10.1103/physrevresearch.2.032003" @default.
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