Entangled electronic state via an interacting quantum dot

G. León, O. Rendon, H. M. Pastawski, Vladimiro Mujica, E. Medina

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)624-630
Number of pages7
JournalEurophysics Letters
Volume66
Issue number5
DOIs
StatePublished - Mar 1 2004
Externally publishedYes

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quantum dots
electron transitions
energy conservation
electronics
electron scattering
electrons
bandwidth
filters
requirements
electric potential
matrices
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Entangled electronic state via an interacting quantum dot. / León, G.; Rendon, O.; Pastawski, H. M.; Mujica, Vladimiro; Medina, E.

In: Europhysics Letters, Vol. 66, No. 5, 01.03.2004, p. 624-630.

Research output: Contribution to journalArticle

León, G, Rendon, O, Pastawski, HM, Mujica, V & Medina, E 2004, 'Entangled electronic state via an interacting quantum dot', Europhysics Letters, vol. 66, no. 5, pp. 624-630. https://doi.org/10.1209/epl/i2003-10257-1
León, G. ; Rendon, O. ; Pastawski, H. M. ; Mujica, Vladimiro ; Medina, E. / Entangled electronic state via an interacting quantum dot. In: Europhysics Letters. 2004 ; Vol. 66, No. 5. pp. 624-630.
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