Double Quantum Dot Coupled to Two Superconductors: Transport and Spin Entanglement

Mahn-Soo Choi, Christoph Bruder and Daniel Loss
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Mahn-Soo Choi: University of Basel, Department of Physics and Astronomy
Christoph Bruder: University of Basel, Department of Physics and Astronomy
Daniel Loss: University of Basel, Department of Physics and Astronomy

A chapter in Macroscopic Quantum Coherence and Quantum Computing, 2001, pp 307-315 from Springer

Abstract: Abstract A double quantum dot coupled to two superconducting leads is studied in the Coulomb blockade regime. The double dot mediates an effective Josephson coupling between the two superconducting leads, which in turn induce an exchange coupling between the spin states of the dots. The Josephson current depends on the spins on the dots, while the spin exchange coupling can be tuned by the superconducting phase difference. This spin-dependent Josephson current can be used to probe directly the correlated spin states (singlet or triplets).

Keywords: Quantum dot; superconductivity; entanglement; Josephson effect (search for similar items in EconPapers)
Date: 2001
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-1-4615-1245-5_31

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DOI: 10.1007/978-1-4615-1245-5_31

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