title: Fast quantum gate via Feshbach-Pauli blocking in a nanoplasmonic trap.
abstract: We propose a simple idea for realizing a quantum gate with two fermions in a double well trap via external optical pulses without addressing the atoms individually. The key components of the scheme are Feshbach resonance and Pauli blocking, which decouple unwanted states from the dynamics. As a physical example we study atoms in the presence of a magnetic Feshbach resonance in a nanoplasmonic trap and discuss the constraints on the operation times for realistic parameters, reaching a fidelity above 99.9% within 42  μs, much shorter than existing atomic gate schemes.
authors.affiliation: Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland and Institut für Quanteninformationsverarbeitung, Universität Ulm, D-89069 Ulm, Germany.
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Jachymski
authors.affiliation: Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland.
authors.forename: Zbigniew
authors.initials: Z
authors.lastname: Idziaszek
authors.affiliation: Institut für Quanteninformationsverarbeitung, Universität Ulm, D-89069 Ulm, Germany.
authors.forename: Tommaso
authors.initials: T
authors.lastname: Calarco