QuBE: a Qubit-controller with Broadband Electronics

ORAL

Abstract

As the number of qubits grows in the pursuit of fault-tolerant superconducting quantum computers, existing microwave control systems pose scalability challenges. Addressing these challenges requires the integration and miniaturization of numerous microwave control units. We have developed a qubit controller that meets the stringent requirements derived from the design of the current superconducting qubits. The system has broadband capability, phase stability, and sufficient performance on timing synchronization and digital signal processing. We have demonstrated simultaneous measurements of multiple qubits with synchronized controllers and frequency multiplexing. We disclose the microwave performance, such as the stabilities of the phase and intensity obtained through the development of several controller systems for more than 60 qubits. We discuss the impact of the stabilities on gate fidelity.

*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

  • Toshi Sumida

    • QuEL, Inc.

Authors

  • Toshi Sumida

    • QuEL, Inc.

  • 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.

  • 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