Narrow bounds for the quantum capacity of thermal attenuators View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2018-12

AUTHORS

Matteo Rosati, Andrea Mari, Vittorio Giovannetti

ABSTRACT

Thermal attenuator channels model the decoherence of quantum systems interacting with a thermal bath, e.g., a two-level system subject to thermal noise and an electromagnetic signal traveling through a fiber or in free-space. Hence determining the quantum capacity of these channels is an outstanding open problem for quantum computation and communication. Here we derive several upper bounds on the quantum capacity of qubit and bosonic thermal attenuators. We introduce an extended version of such channels which is degradable and hence has a single-letter quantum capacity, bounding that of the original thermal attenuators. Another bound for bosonic attenuators is given by the bottleneck inequality applied to a particular channel decomposition. With respect to previously known bounds we report better results in a broad range of attenuation and noise: we can now approximate the quantum capacity up to a negligible uncertainty for most practical applications, e.g., for low thermal noise. More... »

PAGES

4339

Journal

TITLE

Nature Communications

ISSUE

1

VOLUME

9

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41467-018-06848-0

DOI

http://dx.doi.org/10.1038/s41467-018-06848-0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1107590396

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30337632


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