Life after charge noise: recent results with transmon qubits

Details Life after charge noise: recent results with transmon qubits Life after charge noise: recent results with transmon qubits

2008-12-10

arxiv.org/abs/0812.1865v1

Quant. Inf. Proc. 8, 105 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 4 figures. Review article, accepted for publication in Quantum Inf. Proc

Scientific paper

10.1007/s11128-009-0100-6

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.

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