Life after charge noise: recent results with transmon qubits

  • Authors:

  • A. A. Houck;Jens Koch;M. H. Devoret;S. M. Girvin;R. J. Schoelkopf

  • Affiliations:

  • Department of Electrical Engineering, Princeton University, Princeton, USA 08544;Departments of Physics and Applied Physics, Yale University, New Haven, USA 06520;Departments of Physics and Applied Physics, Yale University, New Haven, USA 06520;Departments of Physics and Applied Physics, Yale University, New Haven, USA 06520;Departments of Physics and Applied Physics, Yale University, New Haven, USA 06520

  • Venue:
  • Quantum Information Processing
  • Year:
  • 2009

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Abstract

We review the main theoretical and experimental results for the transmon, a superconducting charge qubit derived from the Cooper pair box. The increased ratio of the Josephson to charging energy results in an exponential suppression of the transmon's sensitivity to 1/f charge noise. This has been observed experimentally and yields homogeneous broadening, negligible pure dephasing, and long coherence times of up to 3 μs. Anharmonicity of the energy spectrum is required for qubit operation, and has been proven to be sufficient in transmon devices. Transmons have been implemented in a wide array of experiments, demonstrating consistent and reproducible results in very good agreement with theory.