Quantum coherence bounds the distributed discords

Establishing quantum correlations between two remote parties by sending an information carrier is an essential step of many protocols in quantum information processing. We obtain trade-off relations between discords and coherence within a bipartite system. Then we study the distribution of coherence...

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Bibliographic Details
Published in:npj quantum information 2022-03, Vol.8 (1), p.1-6, Article 33
Main Authors: Jin, Zhi-Xiang, Li-Jost, Xianqing, Fei, Shao-Ming, Qiao, Cong-Feng
Format: Article
Language:English
Subjects:
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639/766/259
639/766/483/481
639/766/483/640
Classical and Quantum Gravitation
Entropy
Information processing
Physics
Physics and Astronomy
Quantum Computing
Quantum Field Theories
Quantum Information Technology
Quantum Physics
Relativity Theory
Spintronics
String Theory
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Summary:Establishing quantum correlations between two remote parties by sending an information carrier is an essential step of many protocols in quantum information processing. We obtain trade-off relations between discords and coherence within a bipartite system. Then we study the distribution of coherence in a bipartite quantum state by using the relations of relative entropy and mutual information. We show that the increase of the relative entropy of discord between two remote parties is bounded by the nonclassical correlations quantified by the relative entropy of coherence between the carrier and two remote parties, providing an optimal protocol for discord distribution and showing that quantum correlations are the essential resource for such tasks.
ISSN:2056-6387
2056-6387
DOI:10.1038/s41534-022-00543-1