https://doi.org/10.1007/s10051-001-8675-4
Electronic entanglement in the vicinity of a superconductor
1
L.D. Landau Institute for Theoretical Physics, Russian Academy of Sciences, Kosygina Str. 2, 117940, Moscow, Russia
2
Centre de Physique Théorique et Université de la Méditerranée, Case 907, 13288 Marseille, France
3
Theoretische Physik, ETH-Hönggerberg, 8093 Zürich, Switzerland
Corresponding author: a martin@cpt.univ-mrs.fr
Received:
20
September
2001
Published online: 15 December 2001
A weakly biased normal-metal-superconductor junction is considered as a potential device injecting entangled pairs of quasi-particles into a normal-metal lead. The two-particle states arise from Cooper pairs decaying into the normal lead and are characterized by entangled spin- and orbital degrees of freedom. The separation of the entangled quasi-particles is achieved with a fork geometry and normal leads containing spin- or energy-selective filters. This solid state entangler is characterized by noise cross-correlations which are identical to the noise in one lead, a signature consistent with entanglement. A connection to Bell-type experiments is envisioned (cond-mat/0009193).
PACS: 03.67.Hk – Quantum communication / 72.70.+m – Noise processes and phenomena / 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
