Dynamical Coulomb blockade and spin-entangled electrons
Abstract
We consider the production of mobile and nonlocal pairwise spin-entangled electrons from tunneling of a BCS-superconductor (SC) to two normal Fermi liquid leads. The necessary mechanism to separate the two electrons coming from the same Cooper pair (spin-singlet) is achieved by coupling the SC to leads with a finite resistance. The resulting dynamical Coulomb blockade effect, which we describe phenomenologically in terms of an electromagnetic environment, is shown to be enhanced for tunneling of two spin-entangled electrons into the same lead compared to the process where the pair splits and each electron tunnels into a different lead. On the other hand in the pair-split process, the spatial correlation of a Cooper pair leads to a current suppression as a function of distance between the two tunnel junctions which is weaker for effectively lower dimensional SCs.
Cite
@article{arxiv.cond-mat/0307444,
title = {Dynamical Coulomb blockade and spin-entangled electrons},
author = {Patrik Recher and Daniel Loss},
journal= {arXiv preprint arXiv:cond-mat/0307444},
year = {2009}
}
Comments
5 pages, 2 figures