Quantum key distribution without alternative measurements
Abstract
Entanglement swapping between EinsteinPodolskyRosen (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.
 Publication:

Physical Review A
 Pub Date:
 May 2000
 DOI:
 10.1103/PhysRevA.61.052312
 arXiv:
 arXiv:quantph/9911025
 Bibcode:
 2000PhRvA..61e2312C
 Keywords:

 03.67.Dd;
 03.67.Hk;
 03.65.Bz;
 Quantum cryptography;
 Quantum communication;
 Quantum Physics
 EPrint:
 REVTeX, 5 pages, 2 figures. Published version with some comments