Phys. Rev. A 78, 032314 (2008) [6 pages]Entanglement-enhanced quantum key distributionSee Also: Publisher's Note Received 21 December 2007; revised 19 August 2008; published 11 September 2008; corrected 22 September 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.78.032314
DOI:
10.1103/PhysRevA.78.032314
PACS:
03.67.Dd, 03.65.Ud, 42.50.Dv
See AlsoPublisher's Note: Olli Ahonen, Mikko Möttönen, and Jeremy L. O’Brien, Publisher's Note: Entanglement-enhanced quantum key distribution [Phys. Rev. A 78, 032314 (2008)], Phys. Rev. A 78, 039904 (2008). |
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