Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-08-25
"Fundamental Problems of Mesoscopic Physics Interaction and Decoherence", pp. 179-202, eds. I.V. Lerner et al., NATO Science S
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
24 Kluwer pages, 7 figures - proceedings of the NATO/Euresco Conference (Granada Spain, 6-11 Sept. 2003); updated references
Scientific paper
We present electron spin entanglers--devices creating mobile spin-entangled electrons that are spatially separated--where the spin-entanglement in a superconductor present in form of Cooper pairs and in a single quantum dot with a spin singlet groundstate is transported to two spatially separated leads by means of a correlated two-particle tunneling event. The unwanted process of both electrons tunneling into the same lead is suppressed by strong Coulomb blockade effects caused by quantum dots, Luttinger liquid effects or by resistive outgoing leads. In this review we give a transparent description of the different setups, including discussions of the feasibility of the subsequent detection of spin-entanglement via charge noise measurements. Finally, we show that quantum dots in the spin filter regime can be used to perform Bell-type measurements that only require the measurement of zero frequency charge noise correlators.
Loss Daniel
Recher Patrik
Saraga Daniel S.
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