Spin-entangled currents created by a triple quantum dot

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 o...

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Bibliographic Details
Published in:Physical review letters 2003-04, Vol.90 (16), p.166803-166803, Article 166803
Main Authors: Saraga, Daniel S, Loss, Daniel
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.90.166803