2008/12/10 by A. A. Houck, Jens Koch, M. H. Devoret +2 · 2 citations
Physics and Astronomy · #cond-mat.mes-hall
paper · pdf · doi:10.1007/s11128-009-0100-6
published as Quant. Inf. Proc. 8, 105 (2009) · 6 pages, 4 figures. Review article, accepted for publication in Quantum Inf. Proc
arxiv created 2008/12/10 · arxiv updated 2009/12/01
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 microseconds. 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.