Full counting statistics of generic spin entangler with quantum dot-ferromagnet detectors
Department of Physics, Lund University - Box 118, S-221 00 Lund, Sweden
Received: 13 December 2013
Accepted: 20 February 2014
Entanglement between spatially separated electrons in nanoscale transport is a fundamental property, yet to be demonstrated experimentally. Here we propose and analyse theoretically the transport statistics of a generic spin entangler coupled to a hybrid quantum dot-ferromagnet detector system. We show that the full distribution of charges arriving at the ferromagnetic terminals provides complete information on the spin state of the particles emitted by the entangler. This provides means for spin entanglement detection via electrical current correlations, with optimal measurement strategies depending on the a priori knowledge of ferromagnet polarization and spin-flip rates in the detector dots. The scheme is exemplified by applying it to Andreev and triple dot entanglers.
PACS: 73.63.Kv – Quantum dots / 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) / 74.78.Na – Mesoscopic and nanoscale systems
© EPLA, 2014