Negative entropy and information in quantum mechanics

Details Negative entropy and information in quantum mechanics Negative entropy and information in quantum mechanics

1995-12-19

arxiv.org/abs/quant-ph/9512022v3

Phys.Rev.Lett. 79 (1997) 5194

Physics

Quantum Physics

4 pages RevTeX, 2 figures. Expanded discussion of quantum teleportation and superdense coding, and minor corrections. To appea

Scientific paper

10.1103/PhysRevLett.79.5194

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 non-separability. The possibility that negative (virtual) information can be carried by entangled particles suggests a consistent interpretation of quantum informational processes.

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