Post-fabrication resonator frequency trimming enabling fast, high-fidelity dispersive readout of transmon qubits

ORAL

Abstract

Fast, high-fidelity dispersive readout in circuit QED that does not impact qubit relaxation can be achieved using a dedicated Purcell-filter resonator coupled to the readout resonator. Optimal conditions are achieved when the bare frequencies of both resonators are accurately matched so that they form a hybridized system. This requirement can be challenging to meet in fabrication due to non-uniformity of the base layer thickness and previously untested design changes, among other reasons. We present a practical method allowing accurate trimming of the bare frequency of either resonator as gleaned necessary from initial device characterisation. We compare the speed of photon depletion before and after trimming and demonstrate the enhancement of readout fidelity and speed without impacting qubit relaxation. The method does not require extra fabrication steps and also allows the elimination of any frequency collisions between resonators used to measure different qubits with a common feedline.

*Research funded by the Netherlands Organization for Scientific Research (NWO, NWA.1292.19.194]), Intel Corporation, and the Dutch Ministry of Economic Affairs (TKI Allowance for Top Consortia for Knowledge and Innovation).

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Presenters

  • Santiago Valles-Sanclemente

    • QuTech and Kavli Institute of Nanoscienc

Authors

  • Santiago Valles-Sanclemente

    • QuTech and Kavli Institute of Nanoscienc

  • Sean van der Meer

    • Qutech and Kavli Institute of Nanoscience, Delft University of Technology
    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, The Netherlands

  • Matvey Finkel

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, The Netherlands

  • Christos Zachariadis

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, The Netherlands

  • Thijs Stavenga

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, The Netherlands

  • Marc Beekman

    • QuTech and Netherlands Organisation for Applied Scientific Research, The Netherlands

  • Nadia Haider

    • Qutech and Netherlands Organization for Applied Scientific Research
    • Netherlands Org Scientific Res

  • Leonardo DiCarlo

    • Qutech and Kavli Institute of Nanoscience, Delft University of Technology
    • Delft University of Technology