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The classical wave system has demonstrated itself as an excellent platform to realize and investigate novel phenomena and physics. The bedrock principle is to utilize the macroscopic quantities obtained from the homogenization or mean-field treatment. However, it usually deals with Hermitian problems and averages out fluctuations. Therefore, the presentation will cover two topics: non-Hermitian physics and Casimir effect. The first part focuses on the impact of non Hermitian ingredients on soliton formation and dynamics. By constructing a soliton phase diagram, two distinct soliton phases and their transitions are identified. A Wannier-function-based nonlinear Hamiltonian shows that soliton formation critically depends on how skin-mode localization and band nonreciprocity suppress or enhance wave dispersion. Both soliton phases have been demonstrated to be dynamically accessible from bulk and edge excitations. The second part discusses the influence of the metal’s surface electrons on Casimir forces. A three-dimensional frame transformation method has been established by embedding mesoscopic boundary conditions of electromagnetic fields. We find that mesoscopic Casimir forces are sensitive to the surface electron behavior, including spill-in and spill-out, as verified by the multiple scattering method and proximity force approximation. The mechanism has finally been revealed as Casimir softening distances rooted in quantum surface responses of electrons.

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!

After a brief introduction to quantum nonlocality, we propose a set of conditions on the joint probabilities as a test of genuine multipartite nonlocality, and it turns out that all entangled symmetric multipartite qubit states pass this test. In the following we generalize this test to a family of Hardy-type tests, which can detect different degrees of nonlocality ranging from standard to genuine multipartite nonlocality. At last, we explore network nonlocality sharing in an n-branch generalized star network scenario with m observers in each branch and k settings per observer.