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Entanglement Theory Quantum Correlations

Quantum locking of classical correlations and quantum discord of classical-quantum states

arXiv
Authors: S. Boixo, L. Aolita, D. Cavalcanti, K. Modi, A. Winter

Year

2011

Paper ID

8823

Status

Preprint

Abstract Read

~2 min

Abstract Words

114

Citations

N/A

Abstract

A locking protocol between two parties is as follows: Alice gives an encrypted classical message to Bob which she does not want Bob to be able to read until she gives him the key. If Alice is using classical resources, and she wants to approach unconditional security, then the key and the message must have comparable sizes. But if Alice prepares a quantum state, the size of the key can be comparatively negligible. This effect is called quantum locking. Entanglement does not play a role in this quantum advantage. We show that, in this scenario, the quantum discord quantifies the advantage of the quantum protocol over the corresponding classical one for any classical-quantum state.

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  • This paper contributes to the Entanglement Theory & Quantum Correlations research area in the Quantum Articles archive.
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  • A locking protocol between two parties is as follows: Alice gives an encrypted classical message to Bob which she does not want Bob to be able to read until she gives him the key.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1105.2768 [2] arXiv https://arxiv.org/abs/1105.2768 [3] Publisher https://arxiv.org/abs/1105.2768

Local Citation Graph (Related-Paper Links)

Current Paper #8823 #69032 Beyond the Canonical Protocol: ... #69027 Computational Superiority of No... #69013 Quantum correlations and cohere... #68993 Tomography of quantum states wi...

External citation index: OpenAlex citation signal

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