Volume 80, Number 5, December 2007
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||25 October 2007|
Electrostatic control of quantum dot entanglement induced by coupling to external reservoirs
Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid Cantoblanco, 28049 Madrid, Spain
Accepted: 2 October 2007
We propose a quantum transport experiment to prepare and measure charge-entanglement between two electrostatically defined quantum dots. Coherent population trapping, as realized in cavity quantum electrodynamics, can be carried out by using a third quantum dot to play the role of the optical cavity. In our proposal, a pumping which is quantum mechanically indistinguishable for the quantum dots drives the system into a state with a high degree of entanglement. The whole effect can be switched on and off by means of a gate potential allowing both state preparation and entanglement detection by simply measuring the total current.
PACS: 73.21.La – Quantum dots / 73.23.Hk – Coulomb blockade; single-electron tunneling
© Europhysics Letters Association, 2007
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