Progress in Superconducting Qubits

By Robert F. McDermott

Department of Phsics, University of Wisconsin, Madison, WI

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Superconducting integrated circuits incorporating Josephson junctions are an attractive candidate for scalable quantum information processing in the solid state. The circuits behave like artificial atoms, with energy levels that can be tuned over a broad range on nanosecond timescales by appropriate variation of the bias parameters. Coherence times have increased by five orders of magnitude over the last 15 years, and single- and two-qubit gate errors have attained the fault-tolerant threshold. I will review progress in the field, with a focus on recent work in Wisconsin in the areas of decoherence and quantum measurement. I will discuss efforts to identify and suppress the dominant source of qubit dephasing, and I will describe a new approach to scalable, high-fidelity qubit measurement based on microwave photon counting. 

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  • Robert F. McDermott (2015), "Progress in Superconducting Qubits,"

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