Arithmetic loophole in Bell’s theorem

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 […]

Speaker: Thiago H. Moreira Abstract The intersection between quantum mechanics and gravitational physics has been providing challenging puzzles for quite some time. In this presentation I discuss the dynamics of an open quantum system coupled with a bath of gravitons, the quanta of the gravitational field in the linear limit of general relativity. The focus […]

Speaker: Prof. Jungjin Ju Abstract Photonics is a key enabler for quantum systems, providing both core quantum functionality and the means by which quantum effects can be achieved, expressed, combined and utilized. In this talk, long distance quantum communications and silicon based photonic quantum process research activities of ETRI will be presented with short video introduction […]

Speaker: Sergi Nadal-Gisbert Abstract Quantifying entanglement between two regions is particularly elusive in the context of quantum field theory (QFT), mainly because the Hilbert space of a QFT does not factor as a tensor product of Hilbert spaces associated with different regions of spacetime. In this talk, I will adapt tools from Gaussian quantum information […]

Speaker: Grzegorz Rajchel Abstract The ability to characterise and discern quantum channels is a crucial aspect of noisy quantum technologies. In this work, we explore the problem of distinguishing quantum channels when limited to sub-exponential resources, framed as von Neumann (projective) measurements. We completely characterise equivalence classes of quantum channels with different Kraus ranks that […]

Speaker: Dr. Damián Pitalúa-García Abstract Quantum money is the first invention in quantum information science, promising advantages over classical money by simultaneously achieving unforgeability, user privacy, and instant validation. However, standard quantum money relies on quantum memories and long-distance quantum communication, which are technologically extremely challenging. Quantum "S-money" tokens eliminate these technological requirements while preserving […]