Process output nonclassicality and nonclassicality depth of quantum optical channels
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Author: Krishna Kumar Sabapathy
Added by: arkiver
Added Date: 2018-06-28
Language: English
Subjects: Quantum Physics, Optics, Physics
Publishers: arXiv.org
Pages Count: 300
PPI Count: 300
PDF Count: 1
Total Size: 8.13 MB
PDF Size: 280.27 KB
Extensions: pdf, gz, zip, torrent
Contributor: Internet Archive
License: Unknown License
Downloads: 33
Views: 83
Total Files: 12
Media Type: texts
Total Files: 5
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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