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Squaring parametrization of constrained and unconstrained sets of quantum states. (English) Zbl 1386.81021

##### MSC:
 81P16 Quantum state spaces, operational and probabilistic concepts 81P40 Quantum coherence, entanglement, quantum correlations 81P45 Quantum information, communication, networks (quantum-theoretic aspects) 47B10 Linear operators belonging to operator ideals (nuclear, $$p$$-summing, in the Schatten-von Neumann classes, etc.) 47B65 Positive linear operators and order-bounded operators
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##### References:
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