Phys. Rev. Lett. 90, 166803 (2003) [4 pages]Spin-Entangled Currents Created by a Triple Quantum DotReceived 27 May 2002; published 24 April 2003 We propose a simple setup of three coupled quantum dots in the Coulomb blockade regime as a source for spatially separated currents of spin-entangled electrons. The entanglement originates from the singlet ground state of a quantum dot with an even number of electrons. To preserve the entanglement of the electron pair during its extraction to the drain leads, the electrons are transported through secondary dots. This prevents one-electron transport by energy mismatch, while joint transport is resonantly enhanced by conservation of the total two-electron energy. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.166803
DOI:
10.1103/PhysRevLett.90.166803
PACS:
73.63.–b, 03.65.Ud, 85.35.Be
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