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From time-reversal symmetry to quantum Bayes' rules

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arxiv 2212.08088 v2 pith:2LGACG4N submitted 2022-12-15 quant-ph hep-thmath-phmath.MPmath.STstat.TH

classification quant-phhep-thmath-phmath.MPmath.STstat.TH
keywords bayesmathbbquantumrulerulessymmetrytime-reversalappearing
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Bayes' rule $\mathbb{P}(B|A)\mathbb{P}(A)=\mathbb{P}(A|B)\mathbb{P}(B)$ is one of the simplest yet most profound, ubiquitous, and far-reaching results of classical probability theory, with applications in any field utilizing statistical inference. Many attempts have been made to extend this rule to quantum systems, the significance of which we are only beginning to understand. In this work, we develop a systematic framework for defining Bayes' rule in the quantum setting, and we show that a vast majority of the proposed quantum Bayes' rules appearing in the literature are all instances of our definition. Moreover, our Bayes' rule is based upon a simple relationship between the notions of state over time and a time-reversal symmetry map, both of which are introduced here.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Selecting Complex Extremal Surfaces with the Kontsevich--Segal--Witten Criterion

    hep-th 2026-07 conditional novelty 7.0 of 10

    In AdS3, dS3, and AdS4 hyperbolic examples, the Kontsevich-Segal-Witten criterion uniquely selects a three-piece complex contour for timelike extremal surfaces, while timelike strips in AdS4 violate the criterion near...

  2. Temporal Kirkwood-Dirac Quasiprobability Distribution and Unification of Temporal State Formalisms through Temporal Bloch Tomography

    quant-ph 2026-01 conditional novelty 6.0 of 10

    A generalized Kirkwood–Dirac distribution for multi-time processes unifies pseudo-density operators, doubled density operators, and related temporal state formalisms via temporal Bloch tomography.

  3. Emergent Holographic Spacetime from Quantum Information

    hep-th 2025-06 unverdicted novelty 3.0 of 10

    Takayanagi's essay outlines a research program in which holographic spacetime, including the time direction, may emerge from entanglement, complexity, and complex-valued pseudo-entropy, without presenting a new derivation.

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