Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Conditional Quantum One-Time Pad
Physical review letters, 2020-02, Vol.124 (5), p.1-050503, Article 050503
2020

Details

Autor(en) / Beteiligte
Titel
Conditional Quantum One-Time Pad
Ist Teil von
  • Physical review letters, 2020-02, Vol.124 (5), p.1-050503, Article 050503
Ort / Verlag
College Park: American Physical Society
Erscheinungsjahr
2020
Link zum Volltext
Quelle
American Physical Society Journals
Beschreibungen/Notizen
  • Suppose that Alice and Bob are located in distant laboratories, which are connected by an ideal quantum channel. Suppose further that they share many copies of a quantum state ρABE, such that Alice possesses the A systems and Bob the BE systems. In our model, there is an identifiable part of Bob's laboratory that is insecure: a third party named Eve has infiltrated Bob's laboratory and gained control of the E systems. Alice, knowing this, would like use their shared state and the ideal quantum channel to communicate a message in such a way that Bob, who has access to the whole of his laboratory (BE systems), can decode it, while Eve, who has access only to a sector of Bob's laboratory (E systems) and the ideal quantum channel connecting Alice to Bob, cannot learn anything about Alice's transmitted message. We call this task the conditional one-time pad, and in this Letter, we prove that the optimal rate of secret communication for this task is equal to the conditional quantum mutual information I(A;B|E) of their shared state. We thus give the conditional quantum mutual information an operational meaning that is different from those given in prior works, via state redistribution, conditional erasure, or state deconstruction. We also generalize the model and method in several ways, one of which is a secret-sharing task, i.e., the case in which Alice's message should be secure from someone possessing only the AB or AE systems, but should be decodable by someone possessing all systems A, B, and E.
Sprache
Englisch
Identifikatoren
ISSN: 0031-9007
eISSN: 1079-7114
DOI: 10.1103/PhysRevLett.124.050503
Titel-ID: cdi_proquest_miscellaneous_2362100764
Format
Schlagworte
Laboratories

Weiterführende Literatur

Empfehlungen zum selben Thema automatisch vorgeschlagen von bX