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"Quantumness" versus "Classicality" of Quantum States
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Entanglement is one of the pillars of quantum mechanics and quantum information processing, and as a result the quantumness of nonentangled states has typically been overlooked and unrecognized. We give a robust definition for the classicality versus quantumness of a single multipartite quantum state, a set of states, and a protocol using quantum states. We show a variety of nonentangled (separable) states that exhibit interesting quantum properties, and we explore the ``zoo'' of separable states; several interesting subclasses are defined based on their diagonalizing bases, and their non-classical behavior is investigated.
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Cited by 1 Pith paper
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Superactivation of memory effects in a classical Markov environment
Superactivation of backflow of information is realized in a collision model with a classical Markov-chain environment, and the resource needed is quantumness of the Helstrom ensemble rather than entanglement.
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