RQC Seminar

100th RQC Seminar

• Speaker

  Dr. Maja Cassidy
  ( Uneversity of New South Wales )

• Date

  11：00-12：00, December 14, 2023 (Thursday)

• Venue

  Hybrid(ZOOM・ Wako Welfare ＆ Conf. 2F Large Meeting Room）

• Title

  On-chip microwave generation with the Josephson laser

• Inquiries

  rqc_info[at]ml.riken.jp

Abstract
Superconducting electronic devices have reemerged as contenders for both classical and quantum computing due to their fast operation speeds, low dissipation, and long coherence times. In this talk, I will discuss our recent work in Josephson photonics to generate microwave radiation on-chip. We use one of the fundamental aspects of superconductivity, the ac Josephson effect, to demonstrate a laser made from a Josephson junction strongly coupled to a multimode superconducting cavity. A dc voltage bias applied across the junction provides a source of microwave photons, and the circuit’s nonlinearity allows for efficient down-conversion of higher-order Josephson frequencies to the cavity’s fundamental mode. The simple fabrication and operation allows for easy integration with a range of quantum devices, allowing for efficient on-chip generation of coherent microwave photons at low temperatures. Future devices, including single microwave photon generators and detectors will also be discussed.