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Open AccessArticle

Capacity and Entropy of a Retro-Causal Channel Observed in a Twin Mach-Zehnder Interferometer During Measurements of Pre- and Post-Selected Quantum Systems

Electromagnetic and Sensor Systems Department, Naval Surface Warfare Center Dahlgren Division, Dahlgren, VA 22448, USA
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Entropy 2018, 20(6), 411; https://doi.org/10.3390/e20060411
Received: 20 April 2018 / Revised: 18 May 2018 / Accepted: 23 May 2018 / Published: 27 May 2018
(This article belongs to the Special Issue Quantum Nonlocality)
Simple intuitive models are presented for the capacity and entropy of retro-causal channels in measured ensembles of quantum systems which can be represented as statistical mixtures of pre-selected only and pre- and post-selected systems. Measurement data from a twin Mach-Zehnder interferometer experiment are used in these models to discuss the capacity and entropy of an apparent retro-causal channel observed in the experimental data. It is noted that low capacity/low entropy retro-causal channels can exist in strong measurement systems. View Full-Text
Keywords: quantum measurement; pre- and post-selected systems; retro-causal channel; channel capacity; channel entropy quantum measurement; pre- and post-selected systems; retro-causal channel; channel capacity; channel entropy
MDPI and ACS Style

Parks, A.; Spence, S. Capacity and Entropy of a Retro-Causal Channel Observed in a Twin Mach-Zehnder Interferometer During Measurements of Pre- and Post-Selected Quantum Systems. Entropy 2018, 20, 411.

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