General bound on the accessible information for quantum channels with noisy measurements

Kurt Jacobs

doi:10.1117/12.609317

23 May 2005 General bound on the accessible information for quantum channels with noisy measurements

Kurt Jacobs

Author Affiliations +

Proceedings Volume 5842, Fluctuations and Noise in Photonics and Quantum Optics III; (2005) https://doi.org/10.1117/12.609317
Event: SPIE Third International Symposium on Fluctuations and Noise, 2005, Austin, Texas, United States

Abstract

Quantum systems may be used to transmit classical information. To do this the sender encodes information by preparing the system in one of an alphabet of possible states, and sends it to the receiver. The receiver then performs a measurement on the system in order to obtain information about which state was sent. Here we describe a general bound on the information which is accessible to the receiver in such a channel when the receivers measurement is noisy. In addition to extracting classical information, measurements also reduce the entropy of a quantum system. This is important, for example, in quantum feedback control. We discuss two corollaries of the information bound that involve this entropy reduction.

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Kurt Jacobs "General bound on the accessible information for quantum channels with noisy measurements", Proc. SPIE 5842, Fluctuations and Noise in Photonics and Quantum Optics III, (23 May 2005); https://doi.org/10.1117/12.609317

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