Professor Xiang Chao Receives Prestigious Croucher Innovation Award 2025

We are thrilled to announce that Professor Xiang Chao, fellow at the HK Institute of Quantum Science & Technology, has been honored with the Croucher Innovation Award 2025. Professor Zhao is one of four exceptional scholars to receive this prestigious accolade this year.
In his groundbreaking research, Professor Xiang focuses on miniaturizing optical systems to the chip scale, leveraging the myriad benefits of light across various applications. A central element of his work involves the development of integrated on-chip laser sources. By pioneering advancements in semiconductor lasers integrated onto photonic chips, Professor Xiang aims to significantly enhance their performance and functionality.

Utilizing advanced semiconductor micro- and nanofabrication technologies, his research optimizes on-chip laser performance. This enables seamless integration with photonic integrated circuits, leading to improved energy efficiency and broader application potential. Through the technique of heterogeneous integration, Professor Xiang extends the utility of semiconductor lasers beyond traditional optical communications to include fields such as sensing, metrology, imaging, and quantum information processing and computing.

His focus on developing high-performance, low-noise lasers that are scalable and suitable for a wide array of technological applications is set to make a substantial impact on both fundamental scientific research and practical technologies. Professor Xiang’s innovative design and fabrication methods promise to facilitate the creation of more sophisticated and energy-efficient photonic devices.
Please join us in congratulating Professor Xiang Chao on this remarkable achievement, which not only honours his contributions to the field but also significantly advances the capabilities of our institute in the realm of quantum science and technology. For more information, please refer to https://croucher.org.hk/en/news/four-emerging-research-leaders-earn-croucher-innovation-awards
Credit/Source: https://croucher.org.hk/en/news

Dr. Chenfeng Cao and Mr. Weihao Yang awarded the 2025 Joint Post-doctoral Fellowships (JPDF)

We are thrilled to announce that Dr. Chenfeng Cao and Mr. Weihao Yang are awarded the 2025 Joint Post-doctoral Fellowships (JPDF) at the HK Institute of Quantum Science & Technology (HKIQST) and Hong Kong Branch for Quantum Science Center (HKBQSC) of Guangdong-Hong Kong-Macao GBA, through a highly selective procedure of the Selection Panel consisting of Profs Zidan WANG, Wang YAO, Xiaobo YIN, and Shizhong ZHANG.
Dr. Cao received his PhD from The Hong Kong University of Science and Technology, and is currently an esteemed Humboldt Fellow. With an impressive publication record in leading physics journals such as Comm Phys, Phys Rev Appl, Phys Rev Research, and Quantum Science and Technology, he is expected to bring a wealth of knowledge and expertise to our institute.
Mr. Yang, who is expected to receive PhD from The University of Electronic Science and Technology of China around this summer, has made commendable strides in the field of electronics. His research work has been recognized in top-tier journals like Nat Electro and Nat Comm. His passion and dedication towards research are truly inspiring.
At HK Institute of Quantum Science & Technology, Dr. Cao and Mr. Yang will be working on a plethora of theoretical and experimental research projects related to quantum science.
We warmly welcome Dr. Cao and Mr. Yang to our community and anticipate the invaluable insights they will bring. We look forward to witnessing the growth and success that their presence will undoubtedly facilitate.
Congratulations to Dr. Cao and Mr. Yang!

CTCP Seminar: “Deep Boundary Perturbations at a Quantum Critical Point” by Dr. Shang LIU | Wednesday, March 19, 2025, 3:30pm KKLG101

We explore an unconventional class of problems in the study of (quantum) critical
phenomena, termed “deep boundary criticality”. Traditionally, critical systems are analyzed with two types of perturbations: those uniformly distributed throughout the bulk, which can significantly alter the bulk criticality by triggering a nontrivial bulk renormalization group flow, and those confined to a boundary or subdimensional defect, which affect only the boundary or defect condition. Here, we go beyond this paradigm by studying quantum
critical systems with boundary perturbations that decay algebraically (following a power law) into the bulk. By continuously varying the decay exponent, such perturbations can transition between having no effect on the bulk and strongly influencing bulk behavior. We
investigate this regime using two prototypical models based on (1+1)D massless Dirac fermions. Through a combination of analytical and numerical approaches, we uncover exotic scaling laws in simple observables and observe qualitative changes in model behavior
as the decay exponent varies.

APS March Meeting in Hong Kong 2025 | 16-22 March 2025

APS March Meeting in Hong Kong | March 16–22, 2025

The Physical Society of Hong Kong and the American Physical Society have agreed to hold a satellite conference in Hong Kong during the APS March Meeting from March 16 to 22, 2025. Some academic presentations made at the Hong Kong venue will be simultaneously broadcasted to the online platform of the APS March Meeting. Attendees can also view presentations from the APS online platform.

This conference provides a valuable platform for researchers who are unable to attend the meeting in the United States due to visa issues. It offers them the opportunity to showcase their research achievements and engage in academic exchanges with international collaborators.

Conference Organization:

Host Organization: Physical Society of Hong Kong

Co-organizer: American Physical Society | HK Institute of Quantum Science & Technology

Organizing Institutions: City University of Hong Kong | Qebula Mind Limited

Conference Chairs:

Professor Xunli Wang: Chair Professor, Department of Physics, City University of Hong Kong | Board Member and International Councilor, American Physical Society

Professor Zidan Wang: Chair Professor, Department of Physics, University of Hong Kong | Chairman of the Council, Physical Society of Hong Kong

Professor Bei Zeng: Professor, Department of Physics, Hong Kong University of Science and Technology | President, Physical Society of Hong Kong

Conference Committee Members:

Sunny Xin Wang

Xiao Li

Zhedong Zhang

Liang Dai

Conference Secretary:

Sunny Wang Xin: Department of Physics, City University of Hong Kong | Honorary Treasurer, Physical Society of Hong Kong

Jointly Organized by: APS, HK Physical Society of Hong Kong, HK Institute of Quantum Science & Technology, City University of Hong Kong, and Qebula Mind Limited

AQIS’25 25th Asian Quantum Information Conference | 4-8 August 2025

AQIS’25 Conference Announcement

📅 Date: August 4 to August 8, 2025
📍 Venue: Grand Hall of the Lee Shau Kee Lecture Centre, Centennial Campus, the University of Hong Kong (HKU)

Hosted by:
HK Institute of Quantum Science & Technology (HKIQST)
Quantum Information and Computation Initiative (QICI) of the HKU School of Computing and Data Science

The AQIS’25 conference will focus on quantum information processing, communication, and cryptography, bridging the fields of quantum physics, computer science, mathematics, and information technologies. As the natural successor of EQIS’01-EQIS’05 and AQIS’06-AQIS’24, AQIS’25 will feature invited talks, selected oral and poster presentations, as well as other activities.

Conference Topics Include:

Quantum computation and simulation, algorithms, and complexity

Quantum information theory

Concepts, methods, and tools against decoherence

Quantum cryptography

Quantum communications experiments and theory

Quantum metrology

Quantum technologies (optics, NMR, solid state, etc.)

Quantum circuit, computer design, and architecture

Quantum programming languages and semantics

Important Dates:

Talk Submission Deadline: April 25, 2025

Poster-only Submission Deadline: May 16, 2025

Notification of Acceptance: May 30, 2025

Final Manuscript Deadline: June 30, 2025

Early Registration Deadline: June 30, 2025 (all deadlines are until 23:59 anywhere on Earth)

Invited Speakers:

Rotem Arnon-Friedman (Weizman Institute of Science)

Warit Asavanant (University of Tokyo)

Debbie Leung (University of Waterloo)

Chaoyang Lu (University of Science and Technology of China)

Chiao-Hsuan Wang (National Taiwan University)

Additional speakers to be announced…

Sponsors:

HKU School of Computing and Data Science

HK Institute of Quantum Science & Technology (HKIQST)

QICI

Join us at AQIS’25 for a deep dive into the exciting world of quantum information and computation!

CTCP Seminar : “Quantum Spin Liquid as incompressible liquid of electrons” by Prof Yi ZHOU Monday, February 10, 2025, 5:00pm, LE8, Library Extension Building, HKU

An alternative to the “standard” quantum spin liquid model, which was constructed as a gauge theory, will be presented. This new framework is a Landau-type effective theory. We will explore both quasiparticle excitations and collective modes, along with their physical implications.

HKIQST Seminar “Nonequilibrium and nonlinear terahertz spectroscopy study on Higgs modes in conventional and unconventional superconductors” by Prof Nan-Lin WANG on Wednesday, January 15, 2025, 3:00 pm | CYPP3

We present recent progress in exploring the detection of superconducting collective modes
in NbN, MgB2, and YBa2Cu3O6+x using innovative terahertz spectroscopy techniques.
Transient Higgs oscillations and a higher-order nonlinear light-Higgs mode coupling effect
were detected in NbN superconductors. In MgB2, the Higgs mode contribution from the dirty
3D pi-band and the Leggett mode contribution were identified. In YBCO samples, a beat
pattern in the terahertz signal revealed a coupling effect between the Higgs mode and the
mode developed below T*, indicating the pseudogap phase may be a distinct order, not a
precursor to superconductivity. This strong coupling effect provides fresh insights into
superconductivity and the pseudogap.