Pisarczyk, R., Zhao, Z. orcid.org/0000-0002-9043-8289, Ouyang, Y. orcid.org/0000-0003-1115-0074 et al. (2 more authors) (2019) Causal limit on quantum communication. Physical Review Letters, 123 (15). 150502. ISSN 0031-9007
Abstract
The capacity of a channel is known to be equivalent to the highest rate at which it can generate entanglement. Analogous to entanglement, the notion of a causality measure characterizes the temporal aspect of quantum correlations. Despite holding an equally fundamental role in physics, temporal quantum correlations have yet to find their operational significance in quantum communication. Here we uncover a connection between quantum causality and channel capacity. We show the amount of temporal correlations between two ends of the noisy quantum channel, as quantified by a causality measure, implies a general upper bound on its channel capacity. The expression of this new bound is simpler to evaluate than most previously known bounds. We demonstrate the utility of this bound by applying it to a class of shifted depolarizing channels, which results in improvement over previously known bounds for this class of channels.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 American Physical Society. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | Quantum communication; Quantum channels; Quantum theory; Quantum foundations |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/M024261/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/R043825/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/H041222/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 02 May 2023 13:20 |
Last Modified: | 02 May 2023 13:20 |
Status: | Published |
Publisher: | American Physical Society (APS) |
Refereed: | Yes |
Identification Number: | 10.1103/physrevlett.123.150502 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:198720 |