Quantum Error Correction Codes as Exotic Condensed Matter Systems

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 […]

Speaker: Amit Te'eni (Bar-Ilan University)

Speaker: Jan-Åke Larsson (Linköping University) Abstract The usual explanation of the quantum computing speedup is parallel calculation, inserting a superposition of all possible input values into the computation. The picture painted is that the machine performs a calculation for every input, perhaps in multiple parallel worlds, and then combines the outcomes of each individual calculation […]

Speaker: Armin Tavakoli (Lund University) Abstract What is the dimension of a quantum ensemble? The standard answer is to count how many classical states are superposed, but that depends entirely on the reference frame of the observer. I discuss a different approach to the dimensionality of quantum systems which is independent of the frame in […]