majorization 2tensor products 2completely positive maps 1LU approximation 1matrix analysis 1matrix inequalities 1partial order 1quantum information 1singular values 1
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quant-ph2026
Ky Fan majorization for binary tensor products
Michael M. Wolf, Yuanheng Zhou
The paper proves a Ky Fan‑type majorization inequality for the singular values of sums of binary tensor products of matrices, extending previous results to any number of summands a…
quant-ph2026
The Ruskai-Audenaert conjecture & equipartitions of positive operators
Niranjan Kumar, Michael M. Wolf
Several open problems in quantum information theory can be formulated as equipartition problems for positive operators, asking for a decomposition into bounded-rank positive parts…