18th International Conference on Quantum Physics and Logic (QPL) June 7th-11th, 2021, Gdańsk, Poland
QPL is an annual conference that brings together researchers working on mathematical foundations of quantum physics, quantum computing, and related areas, with a focus on structural perspectives and the use of logical tools, ordered algebraic and category-theoretic structures, formal languages, semantical methods, and other computer science techniques applied to the study of physical behaviour in general. Work that applies structures and methods inspired by quantum theory to other fields (including computer science) is also welcome.
QPL 2021 will feature both an on-site and a virtual component, following the success of the online QPL 2020. Should covid-19 restrictions not allow for the on-site event to happen, QPL 2021 will be hosted entirely in the virtual platform.
QPL 2021 will be hosted by the International Centre for Theory of Quantum Technologies, University of Gdańsk.
For more information, please visit https://qpl2021.eu
Wednesday, May 12th, 2021, 14:00 (CET)
Speaker: Grigoris Anastasiou
Title: Anyon model based on the symmetry group D4 and Fibonacci anyons
Abstract: In this presentation, we will make a wide introduction to topological quantum computing. Quantum computers use qubits in order to function and topological quantum computers use anyons, 2D particles, to encode qubits. Anyons can be determined based on the magnetic flux and the charge they are consisted of. In the first part, we will discuss the basics of group theory in order to construct an anyon model. For our anyon model, we used the group D4 and calculated the different combinations of fluxes and charges for every anyon of this model. In the second part, we will talk about the differences between anyons and 3D particles and that we (in principle) could construct a quantum computer based on the properties of anyons. Quantum gates are very sensitive to decoherence, but gates based on the rotation of anyons can guarantee a much better protection of the information. Using the Aharonov-Bohm effect, we will examine how the quantum states acquire a phase which can be used for the coding of the information. On our study, we further examined the operations which can occur between anyons and how they can be simulated with F and R matrices. In the end, we will study the simplest of all anyon models, the Fibonacci anyon model, which allows (in principle) universal quantum computing. To conduct this study, we constructed the F and R matrices for the Fibonacci anyons using some conditions known as pentagon and hexagon equations.
Wednesday, April 28th, 2021, 14:00 (CET)
Speaker: Tomasz Linowski (ICTQT)
Title: Classical description of bosonic quantum fields in terms of the reduced-state-of-the-field framework
Abstract:We discuss compatibility between various quantum aspects of bosonic fields, relevant for quantum optics and quantum thermodynamics, and the mesoscopic formalism of reduced state of the field (RSF). In particular, we derive exact conditions under which Gaussian and Bogoliubov-type evolutions can be cast into the RSF framework. To strengthen the link between the RSF formalism and the notion of classicality for bosonic quantum fields, we prove that RSF contains no information about entanglement in two-mode Gaussian states. For the same purpose, we show that the entropic characterisation of RSF by means of the von Neumann entropy is qualitatively the same as its description based on the Wehrl entropy. Our findings help bridge the conceptual gap between quantum and classical mechanics.
Wednesday, March 17th, 2021, 14:00
Speaker: Marcin Markiewicz (ICTQT)
Title: Physics and Metaphysics of Wigner’s Friends: Even performed pre-measurements have no results
Wednesday, March 3rd, 2021, 14:00
Speaker: Hippolyte Lazourenko-Dourdent (Institut Néel / Université Grenoble Alpes)
Title: Beyond the Quantum Switch: Quantum Circuits with Quantum Control of Causal Order
Wednesday, January 13th, 2020, 14:00
Speaker: Marius Krumm (IQOQI Vienna and University of Vienna)
Title: Semi-device-independent information processing with spatiotemporal degrees of freedom
Wednesday, December 2nd, 2020, 14:00
Speaker: Marco Erba (Università degli Studi di Pavia, INFN)
Title: Bilocal classical theory: the independence of entanglement and complementarity
Friday, December 4th, 2020, 12:15
Speaker: Monika Rosicka (University of Gdańsk)
Title: Labeled graph framework for unique games