Quantum marginal problem and representations of the symmetric group

Details Quantum marginal problem and representations of the symmetric group Quantum marginal problem and representations of the symmetric group

2004-09-17

arxiv.org/abs/quant-ph/0409113v1

Physics

Quantum Physics

AMS-LaTeX version 2.08, 47 pages

Scientific paper

We discuss existence of mixed state of multicomponent system with given spectrum and given reduced density matrices. We give a complete solution of the problem in terms of linear inequalities on the spectra, accompanied with extensive tables of marginal inequalities, including arrays up to 4 qubits. In the second part of the paper we pursue another approach based on reduction of the problem to representation theory of the symmetric group.

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