Deterministic and Highly Efficient Quantum Cryptography with Entangled Photon Pairs

Details Deterministic and Highly Efficient Quantum Cryptography with Entangled Photon Pairs Deterministic and Highly Efficient Quantum Cryptography with Entangled Photon Pairs

2002-11-18

arxiv.org/abs/quant-ph/0211098v2

Physics

Quantum Physics

4 pages, 1 figure, welcomed comment

Scientific paper

We present a protocol for deterministic and highly efficient quantum cryptography with entangled photon pairs in a 4x4-dimentional Hilbert space. Two communicating parties, Alice and Bob first share a both polarization- and path-entangled photon pair, and then each performs a complete Bell-state measurement on their own photon in one of two complementary Bell-state bases. It is demonstrated that each measurement in which both Alice and Bob register a photon can build certain perfect correlation and generate 1.5 key bits on average. The security of our protocol is guaranteed by the non-cloning theorem.

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