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- Publisher Website: 10.1103/PhysRevLett.127.190502
- Scopus: eid_2-s2.0-85119417218
- PMID: 34797135
- WOS: WOS:000718150100009
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Article: Quantum and Classical Data Transmission through Completely Depolarizing Channels in a Superposition of Cyclic Orders
Title | Quantum and Classical Data Transmission through Completely Depolarizing Channels in a Superposition of Cyclic Orders |
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Authors | |
Issue Date | 2021 |
Publisher | American Physical Society. The Journal's web site is located at https://journals.aps.org/prl/ |
Citation | Physical Review Letters, 2021, v. 127 n. 19, p. article no. 190502 How to Cite? |
Abstract | Completely depolarizing channels are often regarded as the prototype of physical processes that are useless for communication: any message that passes through them along a well-defined trajectory is completely erased. When two such channels are used in a quantum superposition of two alternative orders, they become able to transmit some amount of classical information, but still no quantum information can pass through them. Here, we show that the ability to place N completely depolarizing channels in a superposition of N alternative causal orders enables a high-fidelity heralded transmission of quantum information with error vanishing as 1/N. This phenomenon highlights a fundamental difference with the N=2 case, where completely depolarizing channels are unable to transmit quantum data, even when placed in a superposition of causal orders. The ability to place quantum channels in a superposition of orders also leads to an increase of the classical communication capacity with N, which we rigorously prove by deriving an exact single-letter expression. Our results highlight the more complex patterns of correlations arising from multiple causal orders, which are similar to the more complex patterns of entanglement arising in multipartite quantum systems. |
Persistent Identifier | http://hdl.handle.net/10722/308527 |
ISSN | 2023 Impact Factor: 8.1 2023 SCImago Journal Rankings: 3.040 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Chiribella, G | - |
dc.contributor.author | Wilson, M | - |
dc.contributor.author | Chau, HF | - |
dc.date.accessioned | 2021-12-01T07:54:31Z | - |
dc.date.available | 2021-12-01T07:54:31Z | - |
dc.date.issued | 2021 | - |
dc.identifier.citation | Physical Review Letters, 2021, v. 127 n. 19, p. article no. 190502 | - |
dc.identifier.issn | 0031-9007 | - |
dc.identifier.uri | http://hdl.handle.net/10722/308527 | - |
dc.description.abstract | Completely depolarizing channels are often regarded as the prototype of physical processes that are useless for communication: any message that passes through them along a well-defined trajectory is completely erased. When two such channels are used in a quantum superposition of two alternative orders, they become able to transmit some amount of classical information, but still no quantum information can pass through them. Here, we show that the ability to place N completely depolarizing channels in a superposition of N alternative causal orders enables a high-fidelity heralded transmission of quantum information with error vanishing as 1/N. This phenomenon highlights a fundamental difference with the N=2 case, where completely depolarizing channels are unable to transmit quantum data, even when placed in a superposition of causal orders. The ability to place quantum channels in a superposition of orders also leads to an increase of the classical communication capacity with N, which we rigorously prove by deriving an exact single-letter expression. Our results highlight the more complex patterns of correlations arising from multiple causal orders, which are similar to the more complex patterns of entanglement arising in multipartite quantum systems. | - |
dc.language | eng | - |
dc.publisher | American Physical Society. The Journal's web site is located at https://journals.aps.org/prl/ | - |
dc.relation.ispartof | Physical Review Letters | - |
dc.rights | Copyright [2021] by The American Physical Society. This article is available online at [http://dx.doi.org/10.1103/PhysRevLett.127.190502]. | - |
dc.title | Quantum and Classical Data Transmission through Completely Depolarizing Channels in a Superposition of Cyclic Orders | - |
dc.type | Article | - |
dc.identifier.email | Chiribella, G: giulio@cs.hku.hk | - |
dc.identifier.email | Chau, HF: hfchau@hku.hk | - |
dc.identifier.authority | Chiribella, G=rp02035 | - |
dc.identifier.authority | Chau, HF=rp00669 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1103/PhysRevLett.127.190502 | - |
dc.identifier.pmid | 34797135 | - |
dc.identifier.scopus | eid_2-s2.0-85119417218 | - |
dc.identifier.hkuros | 330654 | - |
dc.identifier.volume | 127 | - |
dc.identifier.issue | 19 | - |
dc.identifier.spage | article no. 190502 | - |
dc.identifier.epage | article no. 190502 | - |
dc.identifier.isi | WOS:000718150100009 | - |
dc.publisher.place | United States | - |