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Equivalence between divisibility and monotonic decrease of information in classical and quantum stochastic processes

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arxiv 1408.7062 v3 pith:7KOOLHU6 submitted 2014-08-29 quant-ph cond-mat.stat-mech

classification quant-phcond-mat.stat-mech
keywords stochasticclassicaldecreaseinformationquantumprocessesblackwell-sherman-steincrucial
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The crucial feature of a memoryless stochastic process is that any information about its state can only decrease as the system evolves. Here we show that such a decrease of information is equivalent to the underlying stochastic evolution being divisible. The main result, which holds for both classical and quantum stochastic processes, rely on a quantum version of the so-called Blackwell-Sherman-Stein theorem in classical statistics.

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  1. Divisible and indivisible Stochastic-Quantum dynamics

    quant-ph 2025-05 conditional novelty 7.0 of 10

    A two-state stochastic evolution is divisible between given times if and only if the earlier transition matrix lies in one of two explicitly described cone regions, with continuous curves crossing a critical diagonal ...

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