Physics – Quantum Physics
Scientific paper
1998-08-31
Phys.Rev.A59:169,1999
Physics
Quantum Physics
19 pages, 16 figures
Scientific paper
10.1103/PhysRevA.59.169
We study the use of entanglement purification for quantum communication over long distances. For distances much longer than the coherence length of a corresponding noisy quantum channel, the fidelity of transmission is usually so low that standard purification methods are not applicable. It is however possible to divide the channel into shorter segments that are purified separately and then connected by the method of entanglement swapping. This method can be much more efficient than schemes based on quantum error correction, as it makes explicit use of two-way classical communication. An important question is how the noise, introduced by imperfect local operations (that constitute the protocols of purification and the entanglement swapping), accumulates in such a compound channel, and how it can be kept below a certain noise level. To treat this problem, we first study the applicability and the efficiency of entanglement purification protocols in the situation of imperfect local operations. We then present a scheme that allows entanglement purification over arbitrary long channels and tolerates errors on the per-cent level. It requires a polynomial overhead in time, and an overhead in local resources that grows only logarithmically with the length of the channel.
Briegel H.- J.
Cirac Juan Ignacio
Dür Wolfgang
Zoller Peter
No associations
LandOfFree
Quantum repeaters based on entanglement purification does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Quantum repeaters based on entanglement purification, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantum repeaters based on entanglement purification will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-503339