Entanglement-Enhanced Quantum Key Distribution

Details Entanglement-Enhanced Quantum Key Distribution Entanglement-Enhanced Quantum Key Distribution

2007-12-27

arxiv.org/abs/0712.4241v3

Physical Review A 78, 032314 (2008)

Physics

Quantum Physics

7 pages, 5 figures, new results

Scientific paper

10.1103/PhysRevA.78.032314

We present and analyze a quantum key distribution protocol based on sending entangled N-qubit states instead of single-qubit ones as in the trail-blazing scheme by Bennett and Brassard (BB84). Since the qubits are sent individually, an eavesdropper is limited to accessing them one by one. In an intercept-resend attack, this fundamental restriction allows one to make the eavesdropper's information on the transmitted key vanish if even one of the qubits is not intercepted. The implied upper bound 1/(2N) for Eve's information is further shown not to be the lowest since in the case N = 2, the information can be reduced to less than 30% of that in BB84. In general, the protocol is at least as secure as BB84.

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