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An application of a matrix inequality in quantum information theory

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arxiv quant-ph/0412046 v1 pith:4D5TZJFB submitted 2004-12-06 quant-ph

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keywords productchannelmatrixquantumstateinequalityinformationknown
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Quantum information theory has generated several interesting conjectures involving products of completely positive maps on matrix algebras, also known as quantum channels. In particular it is conjectured that the output state with maximal p-norm from a product channel is always a product state. It is shown here that the Lieb-Thirring inequality can be used to prove this conjecture for one special case, namely when one of the components of the product channel is of the type known as a diagonal channel, which acts on a state by taking the Hadamard product with a positive matrix.

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Cited by 1 Pith paper

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

  1. Riemannian Optimization for Holevo Capacity

    quant-ph 2025-01 reject novelty 6.0 of 10

    The paper introduces a Riemannian gradient descent method, with a derived gradient formula, to compute lower bounds on the Holevo capacity of general quantum channels, with numerical demonstrations.

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