Quantum Information and Entropy

Details Quantum Information and Entropy Quantum Information and Entropy

2006-05-10

arxiv.org/abs/quant-ph/0605096v1

International Journal of Theoretical Physics, vol. 46, pp. 860-876, 2007.

Physics

Quantum Physics

21 pages, 3 figures

Scientific paper

Thermodynamic entropy is not an entirely satisfactory measure of information of a quantum state. This entropy for an unknown pure state is zero, although repeated measurements on copies of such a pure state do communicate information. In view of this, we propose a new measure for the informational entropy of a quantum state that includes information in the pure states and the thermodynamic entropy. The origin of information is explained in terms of an interplay between unitary and non-unitary evolution. Such complementarity is also at the basis of the so-called interaction-free measurement.

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