Volume 80, Number 5, December 2007
Article Number 57001
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 25 October 2007
EPL, 80 (2007) 57001
DOI: 10.1209/0295-5075/80/57001

Electrostatic control of quantum dot entanglement induced by coupling to external reservoirs

E. del Valle, F. P. Laussy and C. Tejedor

Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid Cantoblanco, 28049 Madrid, Spain

received 11 September 2007; accepted in final form 2 October 2007; published December 2007
published online 25 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.

73.21.La - Quantum dots.
73.23.Hk - Coulomb blockade; single-electron tunneling.

© Europhysics Letters Association 2007