Intermediate states in quantum cryptography and Bell inequalities

H. Bechmann-Pasquinucci and N. Gisin
Phys. Rev. A 67, 062310 – Published 26 June 2003
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Abstract

Intermediate states are known from intercept/resend eavesdropping in the Bennett-Brassard 1984 (BB84) quantum cryptographic protocol. But they also play fundamental roles in the optimal eavesdropping strategy on the BB84 protocol and in the CHSH (Clauser-Horne-Shimony-Holt) inequality. We generalize the intermediate states to an arbitrary dimension and consider intercept/resend eavesdropping, optimal eavesdropping on the generalized BB84 protocol and present a generalized Clauser-Horne-Shimony-Holt inequality for two entangled qudits based on these states.

  • Received 7 August 2002

DOI:https://doi.org/10.1103/PhysRevA.67.062310

©2003 American Physical Society

Authors & Affiliations

H. Bechmann-Pasquinucci1 and N. Gisin2

  • 1UCCI.IT, via Olmo 26, I-23888 Rovagnate (LC), Italy
  • 2Group of Applied Physics, University of Geneva, CH-1211, Geneva 4, Switzerland

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Vol. 67, Iss. 6 — June 2003

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