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 language | English (US) |
|---|---|
| Pages (from-to) | 624-630 |
| Number of pages | 7 |
| Journal | Europhysics Letters |
| Volume | 66 |
| Issue number | 5 |
| DOIs | |
| State | Published - Mar 1 2004 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
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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 journal › Article
}
TY - JOUR
T1 - Entangled electronic state via an interacting quantum dot
AU - León, G.
AU - Rendon, O.
AU - Pastawski, H. M.
AU - Mujica, Vladimiro
AU - Medina, E.
PY - 2004/3/1
Y1 - 2004/3/1
N2 - 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.
AB - 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.
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U2 - 10.1209/epl/i2003-10257-1
DO - 10.1209/epl/i2003-10257-1
M3 - Article
VL - 66
SP - 624
EP - 630
JO - EPL
JF - EPL
SN - 0295-5075
IS - 5
ER -