Title

Reduction of Quantum Entropy by Reversible Extraction of Classical Information

Document Type

Article

Publication Date

January 1994

Abstract

We inquire under what conditions some of the information in a quantum signal source, namely a set of pure states ψa emitted with probabilities p a, can be extracted in classical form by a measurement leaving the quantum system with less entropy than it had before, but retaining the ability to regenerate the source state exactly from the classical measurement result and the after-measurement state of the quantum system. We show that this can be done if and only if the source states ψa fall into two or more mutually orthogonal subsets.

Journal

Journal of Modern Optics

Volume

41

Issue

12

First Page

2307

Last Page

2314

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