Process output nonclassicality and nonclassicality depth of quantum-optical channels

We introduce a quantum-optical notion of nonclassicality that we call as the process output nonclassicality for multimode quantum channels. The motivation comes from an information-theoretic point of view and the emphasis is on the output states of a channel. We deem a channel to be `classical'...

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Published in:arXiv.org 2016-04
Main Author: Sabapathy, Krishna Kumar
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Language:English
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Channels
Information theory
Noise measurement
Noise threshold
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description We introduce a quantum-optical notion of nonclassicality that we call as the process output nonclassicality for multimode quantum channels. The motivation comes from an information-theoretic point of view and the emphasis is on the output states of a channel. We deem a channel to be `classical' if its outputs are always classical irrespective of the input, i.e., if the channel is nonclassicality breaking, and nonclassical otherwise. Our condition is stronger than the one considered by Rahimi-Keshari et al. [PRL {\bf 110}, 160401 (2013)] and we compare the two approaches. Using our framework we then quantify the nonclassicality of a quantum process by introducing a noise-robustness type of measure that we call as the nonclassicality depth of a channel. It characterizes a certain threshold noise beyond which a given channel outputs only classical states. We achieve this by generalizing a prescription by Lee [PRA {\bf 44}, R2775 (1991)] to multimode states and then by extension to multimode channels.
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subjects Channels
Information theory
Noise measurement
Noise threshold
title Process output nonclassicality and nonclassicality depth of quantum-optical channels
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