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Qubit-oscillator dynamics in the dispersive regime: Analytical theory beyond the rotating-wave approximation

Source: Phys. Rev. A 80, 033846 (2009); doi:10.1103/PhysRevA.80.033846

Published 30 September 2009

KEYWORDS and PACS
Keywords
PACS
  • 42.50.Pq
    Cavity quantum electrodynamics; micromasers
  • 42.50.Hz
    Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift
  • 03.67.Lx
    Quantum computation architectures and implementations
  • 03.70.+k
    Theory of quantized fields
  • YEAR: 2009
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PUBLICATION DATA
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David Zueco,1 Georg M. Reuther,1 Sigmund Kohler,2 and Peter Hänggi1
1Institut für Physik, Universität Augsburg, Universitätsstraße 1, D-86135 Augsburg, Germany
2Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, E-28049 Madrid, Spain
We generalize the dispersive theory of the Jaynes-Cummings model beyond the frequently employed rotating-wave approximation (RWA) in the coupling between the two-level system and the resonator. For a detuning sufficiently larger than the qubit-oscillator coupling, we diagonalize the non-RWA Hamiltonian and discuss the differences to the known RWA results. Our results extend the regime in which dispersive qubit readout is possible. If several qubits are coupled to one resonator, an effective qubit-qubit interaction of Ising type emerges, whereas RWA leads to isotropic XY interaction. This impacts on the entanglement characteristics of the qubits. ©2009 The American Physical Society
History: Received 20 July 2009; published 30 September 2009
Permalink: http://link.aps.org/abstract/PRA/v80/e033846

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