Volume 66, Number 5, June 2004
|Page(s)||624 - 630|
|Published online||01 May 2004|
Entangled electronic state via an interacting quantum dot
Centro de Física, Instituto Venezolano de Investigaciones Científicas, IVIC Apartado 21827, Caracas 1020 A, Venezuela
2 Departamento de Física, Facultad de Ciencias, Universidad Central de Venezuela Caracas, Venezuela
3 Departamento de Física, FACYT, Universidad de Carabobo Valencia, Edo. Carabobo, Venezuela
4 Facultad de Matemática, Astronomía y Física, LaNAIS de RMS CONICET Universidad Nacional de Córdoba - Ciudad Universitaria, 5000 Córdoba, Argentina
5 Departamento de Química, Facultad de Ciencias, Universidad Central de Venezuela Caracas, Venezuela
Corresponding author: firstname.lastname@example.org
Accepted: 6 April 2004
We study a device for entangling electrons as co-tunneling occurs through a quantum dot where on-site electron-electron interactions U are in place. The main advantage of this device is that single-particle processes are forbidden by energy conservation as proposed by Oliver et al. (Phys. Rev. Lett.88 (2002) 7901). Within this model we calculated the two-electron transition amplitude, in terms of the T-matrix, to all orders in the coupling to the dot, and consider a finite lead bandwidth. The model filters singlet entangled pairs with the sole requirement of Pauli principle. Feynman paths involving consecutive and doubly occupied dot interfere destructively and produce a transition amplitude minimum at a critical value of the onsite repulsion U. Singlet filtering is demonstrated as a function of a gate voltage applied to the dot with a special resonance condition when the dot levels are symmetrically placed about the input lead energy.
PACS: 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) / 73.63.Kv – Quantum dots
© EDP Sciences, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.