Phys. Rev. Lett. 79, 5194–5197 (1997)Negative Entropy and Information in Quantum MechanicsReceived 29 January 1997; published in the issue dated 29 December 1997 A framework for a quantum mechanical information theory is introduced that is based entirely on density operators, and gives rise to a unified description of classical correlation and quantum entanglement. Unlike in classical (Shannon) information theory, quantum (von Neumann) conditional entropies can be negative when considering quantum entangled systems, a fact related to quantum nonseparability. The possibility that negative (virtual) information can be carried by entangled particles suggests a consistent interpretation of quantum informational processes. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.5194
DOI:
10.1103/PhysRevLett.79.5194
PACS:
03.65.Bz, 05.30.-d, 89.70.+c
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