RQC Seminar

147th RQC Seminar

• Speaker

  Prof. Lin Zhirong
  ( Shanghai Institute of Microsystem and Information Technology )

• Date

  14:00-15:00, August 23, 2024 (Friday)

• Venue

  Onsite( Wako C61 Welfare ＆ Conf. 2F Large Meeting Room)

• Title

  Superconducting Electronics for Qubit Control and Non-Classical Quantum State Preparation

• Inquiries

  rqc_info[at]ml.riken.jp

Abstract
Superconducting circuits have demonstrated significant potential as a platform for building large-scale quantum processors. However, scaling superconducting quantum circuits to thousands of qubits within a dilution refrigerator presents considerable challenges. One of the key obstacles is the reliance on classical microwave-based control, which necessitates substantial hardware overhead at room temperature for signal generation and transmission. In this presentation, we will explore a control technique for superconducting qubits that leverages single flux quantum (SFQ) circuitry[1, 2], offering a promising solution to these scalability challenges. Additionally, I will present our latest advancements in microwave quantum optics, including the rapid generation of Schrödinger cat states using a Kerr-tunable Superconducting Nonlinear Asymmetric Inductive eLement (SNAIL) resonator[3], an all-microwave two-qubit gate scheme based on the Autler-Townes effect, and the engineering of Bragg and anti-Bragg bandgaps with superconducting qubit arrays, among other developments.

[1] K. Liu et al. Quasiparticle dynamics in superconducting quantum-classical hybrid circuits, Phys. Rev. B 108, 064512 (2023).
[2] Y. F. Wang et al. Single-Flux-Quantum-Activated Controlled-Z Gate for Transmon Qubits, Phys. Rev. Applied 19, 044031 (2023).
[3] X. L. He et al. Fast generation of Schrödinger cat states using a Kerr-tunable superconducting resonator, Nature Communications 14, 6358 (2023)