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We study a device for entangling electrons as cotunneling occurs through aquantum dot where on-site electron-electron interactions $U$ are in place. Themain advantage of this device is that single particle processes are forbiddenby energy conservation as proposed by Oliver et al\cite{oli02}. Within thismodel we calculated two electron transition amplitude, in terms of theT-matrix, to all orders in the coupling to the dot, and consider a finite leadbandwidth. The model filters singlet entangled pairs with the sole requirementof Pauli principle. Feynman paths involving consecutive and doubly occupied dotinterfere destructively and produce a transition amplitude minimum at acritical value of the onsite repulsion $U$. Singlet filtering is demonstratedas a function of a gate voltage applied to the dot with a special resonancecondition when the dot levels are symmetrically placed about the input leadenergy.Comment: 5 pages, 5 figure

Entangled electronic state via an interacting quantum dot