Quantum

The world smallest discrete unit of a phenomenon

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

QIS’25 Asian Quantum Information Science Conference 📅 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: Quantum Information and Computation Initiative (QICI) of the HKU School of Computing and Data Science HK Institute of Quantum Science & Technology (HKIQST) 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! The webpage address of AQIS 2025 http ://aqis-conf.org/2025/

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.

Our Researches

To conduct multi-disciplinary scientific researches on quantum-related subjects and to unleash the full potential of the quantum laws of nature

INSTITUTE

consists of internationally leading physicists, computer scientists, mathematicians and engineers, and provides a multi-disciplinary scientific research platform at the University of Hong Kong