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The European Physical Journal D

, Volume 65, Issue 1–2, pp 207–217 | Cite as

State-dependent lattices for quantum computing with alkaline-earth-metal atoms

  • A. J. DaleyEmail author
  • J. Ye
  • P. Zoller
Regular Article Ultracold atoms in confined geometries

Abstract

Recent experimental progress with Alkaline-Earth atoms has opened the door to quantum computing schemes in which qubits are encoded in long-lived nuclear spin states, and the metastable electronic states of these species are used for manipulation and readout of the qubits. Here we discuss a variant of these schemes, in which gate operations are performed in nuclear-spin-dependent optical lattices, formed by near-resonant coupling to the metastable excited state. This provides an alternative to a previous scheme [Phys. Rev. Lett. 101, 170504 (2008)], which involved independent lattices for different electronic states. As in the previous case, we show how existing ideas for quantum computing with Alkali atoms such as entanglement via controlled collisions can be freed from important technical restrictions. We also provide additional details on the use of collisional losses from metastable states to perform gate operations via a lossy blockade mechanism.

Keywords

87Sr Rabi Frequency Qubit State Alkali Atom Gate Operation 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  1. 1.Institute for Quantum Optics and Quantum Information of the Austrian Academy of SciencesInnsbruckAustria
  2. 2.Institute for Theoretical PhysicsUniversity of InnsbruckInnsbruckAustria
  3. 3.Department of Physics and AstronomyUniversity of PittsburghPittsburghUSA
  4. 4.JILA, National Institute of Standards and Technology and University of Colorado and Department of PhysicsUniversity of ColoradoBoulderUSA

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