220th RQC Seminar

• 講演者

  Mr. Gong RuiYang
  ( Sun Yat-Sen University) )

• 日程

  2025年8月21日(木), 16:00 - 17:00 (4:00 p.m. - 5:00 p.m.)

• 開催場所

  オンサイト（ Room 535-537 Meeting Room at Wako Main Research Bldg. 5F / 研究本館5階 会議室 (535-537) (C01))

• 講演タイトル

  Constructing Quantum Networks in Waveguide QED Systems via Propagating Photon States

• お問合せ

  norilab_rqc_assist[at]ml.riken.jp

講演概要
Quantum networks are considered the most promising framework for scalable quantum information processing and communication, where quantum state transfer as a key ingredient has attracted increasing attention in recent years. This talk first introduces a tunable quantum router embedded in a dual-rail waveguide, which implements quantum gates, teleportation, non-reciprocity, and circulators. Then, the experimental result of inter-chip quantum connectivity over meter-scale distances through a superconducting-qubit platform will be presented. We designed and fabricated a state-transfer protocol utilizing Gmon as tunable couplers. By varying the coupling strength, we observed the conversion between the stationary and flying photon regions and achieved distributed quantum interconnection at temperatures of both 10 mK and above 1 K.
Moreover, we explored light-atom interaction effects through the analysis of propagating photon characteristics in waveguides. In multi-artificial-qubit systems, phenomena arising from light-atom interactions, specifically electromagnetically induced transparency (EIT) and Autler-Townes splitting (ATS), were observed. Furthermore, we analyzed resonant fluorescence and second-order correlation effects of scattered photons within giant atom systems. Finally, within the context of correlated emission laser (CEL), we realized laser gain and generated squeezed states with squeezing levels exceeding 3 dB.