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• W4313441647 abstract "In the quantization of gauge theories and quantum gravity, it is crucial to treat reference frames such as rods or clocks not as idealized external classical relata, but as internal quantum subsystems. In the Page-Wootters formalism, for example, evolution of a quantum system S is described by a stationary joint state of S and a quantum clock, where time dependence of S arises from conditioning on the value of the clock. Here, we consider (possibly imperfect) internal quantum reference frames R for arbitrary compact symmetry groups, and show that there is an exact quantitative correspondence between the amount of entanglement in the invariant state on RS and the amount of asymmetry in the corresponding conditional state on S. Surprisingly, this duality holds exactly regardless of the choice of coherent state system used to condition on the reference frame. Averaging asymmetry over all conditional states, we obtain a simple representation-theoretic expression that admits the study of the quality of imperfect quantum reference frames, quantum speed limits for imperfect clocks, and typicality of asymmetry in a unified way. Our results shed light on the role of entanglement for establishing asymmetry in a fully symmetric quantum world." @default.
• W4313441647 created "2023-01-06" @default.
• W4313441647 creator A5026395146 @default.
• W4313441647 creator A5041771447 @default.
• W4313441647 creator A5090164220 @default.
• W4313441647 date "2022-12-22" @default.
• W4313441647 modified "2023-10-14" @default.
• W4313441647 title "Entanglement-Asymmetry Correspondence for Internal Quantum Reference Frames" @default.
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• W4313441647 doi "https://doi.org/10.1103/physrevlett.129.260404" @default.
• W4313441647 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36608209" @default.
• W4313441647 hasPublicationYear "2022" @default.
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