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arXiv:0710.5037 · Applied Physics B

Entanglement measures as physical observables

F. Mintert

Published Nov 29, 2007• 15 citations
arXivHTMLPDF
DOI
10.1007/s00340-007-2864-7

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The concept of physical twin observables (PTO) for bipartite quantum states, introduced and proved relevant for quantum information theory in recent work, is substantially simplified. The relation of observable and state is studied in detail from the point of view of coherence entropy. Properties of this quantity are further explored. It is shown that, besides for pure states, also for a class of mixed states, quantum discord (measure of entanglement) can be expressed through the coherence entropy of a PTO complete in relation to the state.