Phys. Rev. A 61, 052312 (2000) [4 pages]Quantum key distribution without alternative measurementsReceived 29 October 1999; published 18 April 2000 Entanglement swapping between Einstein-Podolsky-Rosen (EPR) pairs can be used to generate the same sequence of random bits in two remote places. A quantum key distribution protocol based on this idea is described. The scheme exhibits the following features. (a) It does not require that Alice and Bob choose between alternative measurements, therefore improving the rate of generated bits by transmitted qubit. (b) It allows Alice and Bob to generate a key of arbitrary length using a single quantum system (three EPR pairs), instead of a long sequence of them. (c) Detecting Eve requires the comparison of fewer bits. (d) Entanglement is an essential ingredient. The scheme assumes reliable measurements of the Bell operator. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.61.052312
DOI:
10.1103/PhysRevA.61.052312
PACS:
03.67.Dd, 03.67.Hk, 03.65.Bz
See AlsoAddendum: Adán Cabello, Addendum to “Quantum key distribution without alternative measurements”, Phys. Rev. A 64, 024301 (2001). Comment: Yong-Sheng Zhang, Chuan-Feng Li, and Guang-Can Guo, Comment on “Quantum key distribution without alternative measurements” [Phys. Rev. A 61, 052312 (2000)], Phys. Rev. A 63, 036301 (2001). Reply: Adán Cabello, Reply to “Comment on ‘Quantum key distribution without alternative measurements’ ” [Phys. Rev. A 63, 036301 (2001)], Phys. Rev. A 63, 036302 (2001). |
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