Suppressing Charge Noise Decoherence in Superconducting Charge Qubits

2007/12/20 by J. A. Schreier, A. A. Houck, Jens Koch +9 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.supr-con #quant-ph

paper · pdf · doi:10.1103/physrevb.77.180502

published as Phys. Rev. B 77, 180502(R) (2008) · 4+ pages, 4 figures

arxiv created 2007/12/20 · arxiv updated 2009/12/01

Abstract

We present an experimental realization of the transmon qubit, an improved superconducting charge qubit derived from the Cooper pair box. We experimentally verify the predicted exponential suppression of sensitivity to 1/f charge noise [J. Koch et al., Phys. Rev. A 76, 042319 (2007)]. This removes the leading source of dephasing in charge qubits, resulting in homogenously broadened transitions with relaxation and dephasing times in the microsecond range. Our systematic characterization of the qubit spectrum, anharmonicity, and charge dispersion shows excellent agreement with theory, rendering the transmon a promising qubit for future steps towards solid-state quantum information processing.

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