Journal
INTERNATIONAL JOURNAL OF QUANTUM INFORMATION
Volume 9, Issue 7-8, Pages 1643-1651Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0219749911008301
Keywords
Quantum discord; entanglement; quantum locking
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Funding
- National Research Foundation
- Ministry of Education of Singapore
- Spanish Juan de la Cierva Programme
- Royal Society
- UK EPSRC
- European Commission
- ERC
- Philip Leverhulme Trust
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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. 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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