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• W3098156971 abstract "The theory of relativity associates a proper time with each moving object via its world line. In quantum theory however, such well-defined trajectories are forbidden. After introducing a general characterisation of quantum clocks, we demonstrate that, in the weak-field, low-velocity limit, all good quantum clocks experience time dilation as dictated by general relativity when their state of motion is classical (i.e. Gaussian). For nonclassical states of motion, on the other hand, we find that quantum interference effects may give rise to a significant discrepancy between the proper time and the time measured by the clock. The universality of this discrepancy implies that it is not simply a systematic error, but rather a quantum modification to the proper time itself. We also show how the clock's delocalisation leads to a larger uncertainty in the time it measures -- a consequence of the unavoidable entanglement between the clock time and its center-of-mass degrees of freedom. We demonstrate how this lost precision can be recovered by performing a measurement of the clock's state of motion alongside its time reading." @default.
• W3098156971 created "2020-11-23" @default.
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• W3098156971 date "2020-08-14" @default.
• W3098156971 modified "2023-09-27" @default.
• W3098156971 title "Universal quantum modifications to general relativistic time dilation in delocalised clocks" @default.
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• W3098156971 doi "https://doi.org/10.22331/q-2020-08-14-309" @default.
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