Quantum computing with perpetually coupled qubits: on-site localization of excitations

  • Authors:

  • M. I. Dykman;L. F. Santos;M. Shapiro;F. M. Izrailev

  • Affiliations:

  • Department of Physics and Astronomy, Michigan State University, East Lansing, MI;Department of Physics and Astronomy, Michigan State University, East Lansing, MI;Department of Mathematics, Michigan State University, East Lansing, MI;Instituto de Fisica, Universidad Autónoma de Puebla, Puebla, México

  • Venue:
  • Quantum Information & Computation
  • Year:
  • 2005

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Abstract

We demonstrate that, in a quantum computer with perpetually coupled qubits, all excitations can be confined to their sites (qubits) even without refocusing. The on-site localization is obtained b) constructing a sequence of qubit energies that efficiently suppresses resonant hopping. The time during which a many-excitation state remains strongly localized in an infinite chain can exceed the reciprocal hopping frequency by ≥ 105 already for a moderate bandwidth of qubit energies. The proposed energy sequence is also convenient for performing quantum operations on the qublts.