Generation of Spin Entanglement in Nonequilibrium Quantum Dots

Details Generation of Spin Entanglement in Nonequilibrium Quantum Dots Generation of Spin Entanglement in Nonequilibrium Quantum Dots

2006-12-18

arxiv.org/abs/cond-mat/0612452v2

Physical Review B 76, 085335 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 4 figures, replaced with version to be published in PRB

Scientific paper

10.1103/PhysRevB.76.085335

We propose schemes for generating spatially-separated spin entanglement in systems of two quantum dots with onsite Coulomb repulsion weakly coupled to a joint electron reservoir. An enhanced probability for the formation of spin entanglement is found in nonequilibrium situations with one extra electron on each dot, either in the transient state after rapid changes of the gate voltage, or in the steady state with applied bias voltage. In both cases so-called Werner states with spin singlet fidelity exceeding 1/2 are generated, which indicates entanglement.

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