Quantum Information Processing

, Volume 8, Issue 2, pp 105–115

Life after charge noise: recent results with transmon qubits

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

DOI: 10.1007/s11128-009-0100-6

Cite this article as:
Houck, A.A., Koch, J., Devoret, M.H. et al. Quantum Inf Process (2009) 8: 105. doi:10.1007/s11128-009-0100-6

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.

Keywords

Superconducting qubitsTransmonQuantum computation

PACS

03.67.Lx85.25.-j42.50.-p

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • A. A. Houck
    • 1
  • Jens Koch
    • 2
  • M. H. Devoret
    • 2
  • S. M. Girvin
    • 2
  • R. J. Schoelkopf
    • 2
  1. 1.Department of Electrical EngineeringPrinceton UniversityPrincetonUSA
  2. 2.Departments of Physics and Applied PhysicsYale UniversityNew HavenUSA