Deterministic and Efficient Quantum Cryptography Based on Bell's Theorem

Details Deterministic and Efficient Quantum Cryptography Based on Bell's Theorem Deterministic and Efficient Quantum Cryptography Based on Bell's Theorem

2005-01-28

arxiv.org/abs/quant-ph/0501171v2

Phys. Rev. A 73, 050302(R) (2006)

Physics

Quantum Physics

4 pages, 1 figure; published version with a note added

Scientific paper

10.1103/PhysRevA.73.050302

We propose a novel double-entanglement-based quantum cryptography protocol that is both efficient and deterministic. The proposal uses photon pairs with entanglement both in polarization and in time degrees of freedom; each measurement in which both of the two communicating parties register a photon can establish one and only one perfect correlation and thus deterministically create a key bit. Eavesdropping can be detected by violation of local realism. A variation of the protocol shows a higher security, similarly to the six-state protocol, under individual attacks. Our scheme allows a robust implementation under current technology.

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