Quantum computation architecture using optical tweezers

Christof Weitenberg, Stefan Kuhr, Klaus Mølmer, and Jacob F. Sherson
Phys. Rev. A 84, 032322 – Published 16 September 2011

Abstract

We present a complete architecture for scalable quantum computation with ultracold atoms in optical lattices using optical tweezers focused to the size of a lattice spacing. We discuss three different two-qubit gates based on local collisional interactions. The gates between arbitrary qubits require the transport of atoms to neighboring sites. We numerically optimize the nonadiabatic transport of the atoms through the lattice and the intensity ramps of the optical tweezer in order to maximize the gate fidelities. We find overall gate times of a few 100μs, while keeping the error probability due to vibrational excitations and spontaneous scattering below 103. The requirements on the positioning error and intensity noise of the optical tweezer and the magnetic field stability are analyzed and we show that atoms in optical lattices could meet the requirements for fault-tolerant scalable quantum computing.

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  • Received 14 July 2011

DOI:https://doi.org/10.1103/PhysRevA.84.032322

©2011 American Physical Society

Authors & Affiliations

Christof Weitenberg1,*, Stefan Kuhr1,2, Klaus Mølmer3, and Jacob F. Sherson3,†

  • 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
  • 2University of Strathclyde, Department of Physics, SUPA, Glasgow G4 0NG, United Kingdom
  • 3Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark

  • *Present address: Laboratoire Kastler Brossel, Ecole Normale Supérieure, 24 rue Lhomond, F-75005 Paris, France.
  • sherson@phys.au.dk

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Issue

Vol. 84, Iss. 3 — September 2011

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