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SUMMARY:Linear and Nonlinear Photon and Phonon Manipulations in Supercondu
 cting Cavity Optomechanical Devices
DTSTART;VALUE=DATE-TIME:20260527T020000Z
DTEND;VALUE=DATE-TIME:20260527T030000Z
DTSTAMP;VALUE=DATE-TIME:20260706T002600Z
UID:indico-event-5058@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Yulong Liu（刘玉龙） (Beijing Academy of Quantu
 m Information Sciences)\n\nHost: Prof. Chunxiao Liu Venue: TDLI Meeting
  Room N400Tencent meeting link:   https://meeting.tencent.com/dm/118ndC4
 qwd4Y  Meeting ID: 521405370\, no password Abstract:Cavity optomechani
 cs explores the radiation-pressure coupling between light and macroscopic 
 mechanical resonators\, constituting a forefront of light–matter interac
 tion. Benefiting from rapid advances in semiconductor micro- and nano-fabr
 ication\, a rich variety of optomechanical devices has emerged\, enabling 
 diverse studies now routinely exploited for precision sensing\, tests of q
 uantum mechanics\, and hybrid quantum-information processing. Yet\, among 
 the profusion of designs\, only a handful can be stably operated deep in t
 he quantum regime. This talk focuses on superconducting optomechanical ci
 rcuits. I will report our recent progress in integrating high-Q silicon-ni
 tride/silicon-carbide membrane resonators with microwave cavities [1\,2]. 
 Using cavity sideband cooling\, we have prepared a macroscopic mechanical 
 mode in its quantum ground state and performed quantum non-demolition meas
 urements of the resonator’s quantum state[3]. On this basis we demonstra
 te on-demand writing\, storage\, and retrieval of microwave photonic state
 s\, setting a new record for the storage time of microwave photons [4\,5].
 Beyond linear optomechanical coupling\, I will address nonlinear effects a
 nd their role in multimode frequency-comb generation. In a single cavity\,
  two mechanical resonator platforms\, we observe and study the interaction
  and hybridization between two distinct mechanical modes [6]. In two-cavit
 y\, one-resonator platform we show how phonon lasing drives Floquet cavity
  modes to produce thresholdless frequency combs [7]. Moreover\, by enginee
 ring time-modulated optomechanical coupling\, we implement reservoir engin
 eering that reveals collective interference induced coherent perfect absor
 ption and infinite group delay/advance in quantum regime. References:1. 
   Yulong Liu\, Qichun Liu\, Shuaipeng Wang\, Zhen Chen\, Mika A. Sillanp
 ää*\, and Tiefu Li#\, Optomechanical Anti-Lasing with Infinite Group Del
 ay at a Phase Singularity\, Physic Review Letters 127\, 273603 (2021).2. 
   Sishi Wu\, Yulong Liu‡\, Qichun Liu\, Shuaipeng Wang\, Zhen Chen\, an
 d Tiefu Li#\, Hybridized frequency combs in multimode cavity electromechan
 ical system\, Physic Review Letters 128\, 153901 (2022). 3.   Yulong Li
 u\, Jingwei Zhou\, Laure M. de Lépinay\, and Mika A. Sillanpää#\, Quant
 um backaction evading measurements of a silicon nitride membrane resonator
 \, New Journal of Physics 24\, 083043 (2022).4.   Yulong Liu‡\, Qichun
  Liu\, Huanying Sun\, Mo Chen\, Shuaipeng Wang\, and Tiefu Li#\, Coherent 
 memory for microwave photons based on long-lived mechanical excitations\, 
 Nature: npj Quantum Information 9\, 80 (2023).5.   Yulong Liu‡\, Huany
 ing Sun\, Qichun Liu\, Haihua Wu\, Mika A. Sillanpää\, and Tiefu Li#\,De
 generacy-breaking and long-lived multimode microwave electromechanical sys
 tems enabled by cubic silicon-carbide membrane crystals\, Nature Communica
 tions 16\, 1207 (2025).6.   Sihan Wang\, Cheng Wang\, Matthijs H. J. de 
 Jong\, Laure Mercier de Lépinay\, Jingwei Zhou‡\, Mika A. Sillanpää\,
  and Yulong Liu#\, Pump-Threshold-Free Frequency Comb via Cavity Floquet E
 ngineering\, Nature Communications (2026).  https://doi.org/10.1038/s4146
 7-026-72320-z Biography:Yulong Liu pursued his direct doctoral degree at 
 the Department of Microelectronics (now School of Integrated Circuits)\, T
 singhua University in 2012\, and paid an academic visit to RIKEN\, Japan d
 uring his study. He conducted postdoctoral research at the Finnish Quantum
  Technology Centre and Department of Applied Physics\, Aalto University in
  2017. He joined Beijing Academy of Quantum Information Sciences in 2020\,
  currently serving as a researcher in the Quantum Computing Research Depar
 tment and leader of the Quantum Interface Devices and Systems team. His re
 search focuses on cutting-edge cavity optomechanical quantum information d
 evices.\n\nhttps://indico-tdli.sjtu.edu.cn/event/5058/
LOCATION:Tsung-Dao Lee Institute/N4F-N400 - meeting room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/5058/
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