Tight frames and quaternionic spherical designs

Speaker: Shayne Waldron (Mathematics Department, University of Auckland) Abstract We give a general introduction to finite tight frames, spherical designs and their applications. Examples of interest include SICs (complex equiangular lines) and MUBs (mutually unbiased bases). I will consider how the theory can be extended to tight frames over the quaternions, including the example of […]

Speaker: Kazuki Sakurai (Institute of Theoretical Physics, University of Warsaw) Abstract Magic, a key quantum resource beyond entanglement, remains poorly understood in terms of its structure and classification. In this talk, I demonstrate a striking connection between high-dimensional symmetric lattices and quantum magic states. By mapping vectors from the E8, BW16 and E6 lattices into […]

Speaker: Siddhartha Das (International Institute of Information Technology, Hyderabad, India) Abstract What would be a reasonable definition of the conditional entropy of bipartite quantum processes, and what novel insight would it provide? We develop this notion using desirable information-theoretic axioms and define the corresponding quantitative formulas based on the generalized channel divergences, e.g., quantum relative […]

Speaker: Paweł Rykała, MSc. in Theoretical Physics Abstract With the advent of the infamous Toric Code, discovered almost 30 years ago by Prof. Alexei Kitaev, the field of quantum error correction blossomed into its modern form. In this introductory seminar, I will explain how a large class of promising Quantum Error Correction codes, topological stabilizer […]

Speaker: Seungbeom Chin (Okinawa Institute of Science and Technology) Abstract I explain a graph-based framework that provides a systematic strategy for designing optimized schemes to generate multipartite entangled states in linear quantum networks. We call the graph formalism the Linear Quantum Graph Picture (LQG picture). This talk consists of three parts: First, I explain the […]

Speaker: Guillem Müller-Rigat (ICFO, Barcelona) Abstract We present a three-outcome Bell inequality which we show to be naturally suited to explore non- local correlations in many-body spin-1 systems or SU(3) models. From such an inequality, we show how simple bounds on single-particle observables can be used to construct Bell dimension witnesses, i.e., criteria whose violation […]

Speaker: Jędrzej Burkat (Cavendish Laboratory, University of Cambridge) Abstract With the prospect of reaching hundreds of fault-tolerant qubits by the end of the decade, scaling up quantum computing infrastructure is as much of a theoretical as a practical challenge. Against the backdrop of progress in hardware, simple yet effective techniques are needed to address the […]

Speaker: Jeongho Bang (Yonsei University, Korea) Abstract The learner's ability to generate a hypothesis that closely approximates the target function is crucial in machine learning. Achieving this requires sufficient data; however, unauthorized access by an eavesdropping learner can lead to security risks. Thus, it is important to ensure the performance of the "authorized" learner by […]

Speaker: Marek Czachor (Politechnika Gdańska) Abstract The talk is based on the following preprints: arXiv:2301.10727 Contra Bellum: Bell's theorem as a confusion of languages arXiv:2105.12728 Imitating quantum probabilities: Beyond Bell's theorem and Tsirelson bounds arXiv:2010.03366 Unifying Aspects of Generalized Calculus arXiv:2004.04097 Arithmetic loophole in Bell's theorem: An overlooked threat to entangled-state quantum cryptography

Speaker: Rajendra Bhati (Centrum Fizyki Teoretycznej, PAN) Abstract Gottesman-Kitaev-Preskill (GKP) states provide a promising route to fault-tolerant photonic quantum computing. In this talk, I will give a brief overview of GKP-based photonic quantum computing, highlighting its advantages and limitations. I will then discuss the challenges associated with classical simulations of multi-mode photonic systems and propose […]