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Quantum discord as a resource for quantum cryptography.


ABSTRACT: Quantum discord is the minimal bipartite resource which is needed for a secure quantum key distribution, being a cryptographic primitive equivalent to non-orthogonality. Its role becomes crucial in device-dependent quantum cryptography, where the presence of preparation and detection noise (inaccessible to all parties) may be so strong to prevent the distribution and distillation of entanglement. The necessity of entanglement is re-affirmed in the stronger scenario of device-independent quantum cryptography, where all sources of noise are ascribed to the eavesdropper.

SUBMITTER: Pirandola S 

PROVIDER: S-EPMC4223666 | BioStudies | 2014-01-01T00:00:00Z

REPOSITORIES: biostudies

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