Entanglement-enhanced quantum key distribution

Olli Ahonen, Mikko Möttönen, Jeremy O'Brien

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)
17 Downloads (Pure)


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 1984 (BB84). Since the qubits are sent and acknowledged 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 this information is further shown not to be the lowest, as the information can be reduced to less than 30% of that in the BB84 scheme in the case N=2. In general, the protocol is at least as secure as BB84.

Original languageEnglish
Article number032314
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number3
Publication statusPublished - 11 Sept 2008
Externally publishedYes


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