Experimental demonstrations of broadband quantum control of superconducting qubits with QuBE (Qubit-controller with Broadband Electronics)

ORAL

Abstract

We have developed a scalable qubit controller using broadband electronics that meets the stringent requirements for superconducting quantum processors. We demonstrate broadband control of fixed-frequency superconducting transmon qubits in a two-dimensional array. Utilizing both the inversion recovery and spin-echo methods implemented with the qubit controller, we achieved T1 and T2 of more than 60 μs. Applying the DRAG pulses synthesized, we obtained a single-qubit gate fidelity of more than 99.9%. The broadband electronics enable the execution of sequences involving multiple pulses separated in frequency by more than 1 GHz. With this capability, we achieved unconditional state cooling via driving the f0-g1 transition. We also implemented cross-resonance (CR) gates by applying the CR and single-qubit drives separated by a frequency exceeding 1 GHz through the same control ports.

*This work was supported by MEXT Q-LEAP Grant Number JPMXS0120319794 and JPMXS0118068682, JST COI-NEXT and Moonshot program JPMJMS226A and JPMJMS2067.

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Presenters

  • Makoto Negoro

    • QIQB, Osaka University; QuEL, Inc.

Authors

  • Makoto Negoro

    • QIQB, Osaka University; QuEL, Inc.

  • Kazuhisa Ogawa

    • Osaka University
    • QIQB, Osaka University

  • Takefumi MIYOSHI

    • QIQB, Osaka University; QuEL, Inc.; e-trees.Japan, Inc.

  • Hidehisa Shiomi

    • QIQB, Osaka University; QuEL, Inc.

  • Shinichi Morisaka

    • QIQB, Osaka University; QuEL, Inc.

  • Ryo Matsuda

    • Graduate School of Engineering Science, Osaka University

  • Keisuke Koike

    • e-trees.Japan, Inc.

  • Satoshi Funada

    • e-trees.Japan, Inc.

  • Ryutaro Ohira

    • QuEL, Inc.

  • Toshi Sumida

    • QuEL, Inc.

  • Yoshinori Kurimoto

    • QuEL, Inc.

  • Yuuya Sugita

    • QuEL, Inc.

  • Yosuke Ito

    • QuEL, Inc.

  • Yasunari Suzuki

    • NTT Corporation
    • NTT computer & data science laboratories
    • NTT Computer and Data Science Laboratories, NTT Corporation

  • Peter A Spring

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

  • Shiyu Wang

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

  • 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)

  • 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