3D-integrated tunable transmon qubits with long coherence time and low crosstalk

ORAL

Abstract

Large-scale quantum computers with more than a thousand qubits are expected to be built within the next decade. However, planar wiring for superconducting qubits would limit the system size to around a hundred qubits. Achieving a scalable qubit structure with three-dimensional (3D) wiring that can fully control the qubit in terms of σz and σx is still a significant challenge. Here, we demonstrate a 4×4 concentric tunable transmon qubit chip measured in a pogo-pin package with vertical wiring. We show that we can apply more than 600μA of dc current through the pogo pins to all the qubits without affecting their coherence time and thermal excitation. Besides, our chip shows quite low σz-crosstalk (<5x10-3), and σx-crosstalk (<30dB) with long coherence time (T1 >200μs at 4GHz, T2echo >100μs at the sweet point). These key 3D-integration technologies pave the way for tunable qubit-based large-scale superconducting quantum computing and quantum simulation.

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Presenters

  • Zhiguang Yan

    • Riken Center for Quantum Computing (RQC)

Authors

  • Zhiguang Yan

    • Riken Center for Quantum Computing (RQC)

  • Shuhei Tamate

    • RIKEN Center for Quantum Computing
    • RIKEN Center for Quantum Computing (RQC)
    • Riken Center for Quantum Computing (RQC)

  • Yutaka Tabuchi

    • RIKEN Center for Quantum Computing
    • Riken Center for Quantum Computing (RQC)

  • Rui Li

    • Riken Center for Quantum Computing (RQC)

  • Kun Zuo

    • University of Sydney
    • ARC Centre of Excellence for Engineered Quantum Systems, School of Physics, The University of Sydney, Sydney, NSW, 2006
    • Riken Center for Quantum Computing (RQC)

  • Laszlo Szikszai

    • Riken Center for Quantum Computing (RQC)

  • Alexander Badrutdinov

    • Riken Center for Quantum Computing (RQC)

  • Koichi Kusuyama

    • Riken Center for Quantum Computing (RQC)

  • Yuji Hishida

    • National Institute of Information and Communications Technology

  • Hirotaka Terai

    • NICT
    • National Institute of Information and Communications Technology

  • Go Fujii

    • National Institute of Advanced Industrial Science and Technology

  • Wataru Mizubayashi

    • National Institute of Advanced Industrial Science and Technology

  • Katsuya Kikuchi

    • National Institute of Advanced Industrial Science and Technology

  • Yasunobu Nakamura

    • RIKEN Center for Quantum Computing; Department of Applied Physics, The University of Tokyo
    • RIKEN Center for Quantum Computing (RQC)
    • 1. Riken Center for Quantum Computing (RQC) 2. Department of Applied Physics, Graduate School of Engineering, The University of Tokyo