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Average Entropy of a Subsystem

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arxiv hep-th/9601132 v1 pith:TPXJU4BX submitted 1996-01-24 hep-th

classification hep-th
keywords averagedimensionentropysubsystemconjectureconjecturedhilbertletter
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abstract

It was recently conjectured by D. Page that if a quantum system of Hilbert space dimension $nm$ is in a random pure state then the average entropy of a subsystem of dimension $m$ where $m \leq n$ is $ S_{mn} = \sum^{mn}_{k=n+1}(1/k) - (m-1)/2n$. In this letter this conjecture is proved.

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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. Revisiting the Page curve and its moments. A combinatorial approach

    quant-ph 2026-06 unverdicted novelty 6.0 of 10

    Derives closed expressions for power moments of entanglement entropy of random states via Schur-Weyl duality and S_N character theory.

  2. The Maximal Entanglement Limit in Statistical and High Energy Physics

    quant-ph 2026-01 unverdicted novelty 6.0 of 10

    Quantum systems reach a Maximal Entanglement Limit where entanglement geometry produces thermal reduced density matrices and probabilistic behavior in statistical and high-energy physics.

  3. Modifications of the Page Curve from correlations within Hawking radiation

    hep-th 2019-08 conditional novelty 5.0 of 10

    For a qubit model of Bell-pair Hawking emission, the per-step change in radiation entanglement entropy is bounded between (1-4*epsilon2^2-sqrt(1-gamma^2))*log2 and sqrt(1-4*epsilon2^2)*log2, yielding an early Page-cur...

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