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• W3166149779 startingPage "865" @default.
• W3166149779 abstract "One of the key ways in which quantum mechanics differs from relativity is that it requires a fixed background reference frame for spacetime. In fact, this appears to be one of the main conceptual obstacles to uniting the two theories. Additionally, a combination of the two theories is expected to yield non-classical, or indefinite, causal structures. In this paper, we present a background-independent formulation of the process matrix formalism - a form of quantum mechanics that allows for indefinite causal structure - while retaining operationally well-defined measurement statistics. We do this by postulating an arbitrary probability distribution of measurement outcomes across discrete chunks of spacetime, which we think of as physical laboratories, and then requiring that this distribution be invariant under any permutation of laboratories. We find (a) that one still obtains nontrivial, indefinite causal structures with background independence, (b) that we lose the idea of local operations in distinct laboratories, but can recover it by encoding a reference frame into the physical states of our system, and (c) that permutation invariance imposes surprising symmetry constraints that, although formally similar to a superselection rule, cannot be interpreted as such." @default.
• W3166149779 created "2021-06-22" @default.
• W3166149779 creator A5055199939 @default.
• W3166149779 creator A5059934038 @default.
• W3166149779 date "2022-11-28" @default.
• W3166149779 modified "2023-10-17" @default.
• W3166149779 title "Background Independence and Quantum Causal Structure" @default.
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• W3166149779 doi "https://doi.org/10.22331/q-2022-11-28-865" @default.
• W3166149779 hasPublicationYear "2022" @default.
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