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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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