School of Physics · Zhejiang University

X2 -Hybrid Quantum System Lab (website under construction)

News
2026.07
Openings
We are recruiting Master and PhD students, postdocs, and RA. See Openings for details.
2026.07
Starting of the group
Dr. Xiang Xi accepted the offer of ZJU Physics, and will join there soon。
Research
⚛️

Ultra-low-loss hybrid phononic circuits

Our research focuses on designing ultra-low-loss phononic devices and understanding their fundamental physics. We aim to build photon-phonon integrated chips, analogous to electronic ICs, and heterogeneously integrate phononic devices with superconducting circuits for quantum sensing and applications. We also explore topological physics on phononic chip platforms.

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Classical and quantum sensing

We will extend our high-performance phononic circuits toward various sensing applications. In particular, we aim to develop phononic interferometry and explore non-classical phononic states for enhanced sensing.

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Quantum interconnect and memory

Leveraging our ultra-low-loss phononic membranes with long coherence times, we strongly couple them to optical cavities and superconducting circuits to build high-performance quantum microwave-to-optical transducers and memories for future quantum networking. We also investigate quantum acoustic dynamics.

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Exploring New Physics

Our phononic devices are among the best sensors for force, mass, and so on. It is a very good plaform to explore unknown physics. For example, we can use it to explore fundamental formulation of optical force.

Publications

Selected Publications

2026 Fast stroboscopic imaging of large topological mechanical modes
Ilia Chernobrovkin, Maurice Debray, Frederik Holst Knudsen, Thibault Capelle, Mads Bjerregaard Kristensen, Michael Pitts, Xiang Xi†, Albert Schliesser†
Physical Review Applied 25, 064002 (2026)
DOI
2025 A soft-clamped topological waveguide for phonons
Xiang Xi†, Ilia Chernobrovkin, Jan Košata, Mads B. Kristensen, Eric C. Langman, Anders S. Sørensen, Oded Zilberberg, Albert Schliesser†
Nature, 642, 947–953
DOI
2025 A topological parametric phonon oscillator
Xiang Xi*, Jingwen Ma*, and Xiankai Sun
Advanced Materials, 19, 1056–1061
2023 Membrane-in-the-middle optomechanics with a soft-clamped membrane at milliKelvin temperatures
Eric Planz*, Xiang Xi*, Thibault Capelle*, Eric C. Langman, and Albert Schliesser
Optics Express 31, 41773-41782 (2023)
2022 Highly tunable broadband coherent wavelength conversion with a fiber-based optomechanical system
Xiang Xi, Chang-Ling Zou, Chun-Hua Dong, and Xiankai Sun
Advanced Photonics 4 (5): 056003, Sep. 2022. [featured as cover article].
2021 Experimental investigation of the angular symmetry of optical force in a solid dielectric
Xiang Xi, Jingwen Ma, Zhong-Hao Zhou, Xin-Xin Hu, Yuan Chen, Chang-Ling Zou, Chun-Hua Dong, and Xiankai Sun
Optica 8 (11): 1435-1441, Nov. 2021.
2021 Nanomechanical topological insulators with an auxiliary orbital degree of freedom
Jingwen Ma*, Xiang Xi*, Yuan Li, and Xiankai Sun
Nature Nanotechnology 16 (5): 576-583, May 2021.
2021 Experimental demonstration of dual-band nano-electromechanical valley-Hall topological metamaterials
Jingwen Ma*, Xiang Xi*, and Xiankai Sun
Advanced Materials, 33 (10): 2006521, 2021
2021 Observation of chiral edge states in gapped nanomechanical graphene
Xiang Xi*, Jingwen Ma*, Shuai Wan, Chun-Hua Dong, and Xiankai Sun
Science Advances, 7 (2): eabe1398, Jan. 2021
2021 Graphene-assisted electro-optomechanical integration on a silicon-on-insulator platform
Xiang Xi, Zefeng Chen, Jian-Bin Xu, and Xiankai Sun
Optics Express 28 (10), 14386–14395, 2020.
2020 Carrier-mediated cavity optomechanics in a semiconductor laser
Xiang Xi, Jingwen Ma, and Xiankai Sun
Physical Review A 99 (5): 053837, 2019.

Full list on Google Scholar and ORCID.

People
Principal Investigator
Xiang Xi's photo
Xiang Xi · 习翔
Tenure-check Assistant Professor
School of Physics, Zhejiang University
Email: xiang.xi@zju.edu.cn
Postdoctoral Researchers
WL
Dr. This can be you · XX
Postdoctoral Researcher
Quantum electromechanics
PhD Students
ZW
This can be you · XX
PhD Candidate (Year x)
Quantum acoustics
Openings

Postdoctoral Researcher
Open
We have several postdoc position openning for the research field of ultracoherent phononic circuits, quantum opto- and electromechanics, topological phononics, and so on. The position is fully funded for two years with possibility of extension.
  • PhD in physics, optics, phononics, superconducting circuits, or related field
  • Experience with opto/electro-mechanical measurements, superconducting circuits, or nanofabrication
  • Good passion on physics and experiments, open for collaboration
PhD Student (2027 intake)
Open
We are accepting PhD applications for the 2027 academic year. Students will have the freedom to choose the research topic that is happening in the lab.
  • Bachelor's or Master's degree in physics or engineering
  • Background in physics, optics, or related
  • Lab experience is a plus
Visiting Students / Interns
Open
We welcome undergraduate, Master's students, exchange student, or others, for short-term research visits (3–6 months). Projects of great fun are available in both theory and experiment.
  • Currently enrolled in a Bachelor's or Master's programme, or gap year student
  • Interest in optics, mechanics, and quantum physics or quantum information
Gallery

Life about the Group

Paine_2026
Hiking at Patagonia
🔬 Lab equipment photo
Dilution refrigerator setup
🎉 Lab event photo
Lab retreat 2024
Contact

Get in Touch

Address
No. 8 Hainayuan Building, Zijingang Campus
Zhejiang University
Hangzhou, China
For Prospective Members
Please email your CV and a brief description of your research interests. See Open Positions for current openings.