Gaussian states, Kähler structures and an entanglement duality

Speaker: Robert H. Jonsson (Wallenberg Initiative on Networks and Quantum Information, Nordita (Stockholm)) Abstract Gaussian quantum states play a central role in many branches of physics – from quantum optics, to condensed matter and quantum field theory. In this talk, I aim to showcase the strength of the Kähler structure formalism for Gaussian states by […]

Speaker: Ross Duncan (Cambridge Quantum) Abstract Quantum computers are based on the laws of quantum mechanics rather than Boolean logic; this implies very different algorithmic capabilities and, perhaps more surprisingly, very different issues across the board from software architecture to formal methods. In this talk I’ll give a broad overview of the current state of […]

Speaker: Alejandro Jenkins (ICTQT) Abstract The question of how heat is persistently transported from the Sun's photosphere (at about 6,000 K) to the much hotter corona (at about 10^6 K) is one of the great open puzzles in astrophysics. Using the quantum Markovian master equation, we show that convection in the stellar photosphere generates plasma […]

Speaker: Sebastian Szybka  (Jagiellonian University) Abstract Standing waves are a quite common phenomenon in physics.They are well understood in linear theories. In Einstein's gravity, which is a nonlinear theory, the lack of superposition principle complicates studies. I will present exact solutions to Einstein equations that correspond to standing gravitational waves. They provide useful toy-models that […]

Speaker: Pedro Dieguez (ICTQT) Abstract Wheeler’s delayed-choice experiment, a scenario wherein a classical apparatus, typically an interferometer, is settled only after the quantum system has entered it, has corroborated the complementarity principle. However, the quantum version of Wheeler's delayed-choice experiment has challenged the robustness of this principle. Based on the visibility at the output of […]

Speaker: Sergii Strelchuk (Department of Applied Mathematics and Theoretical Physics, University of Cambridge) Abstract In this talk, I will discuss one of the key properties which are responsible for the unreasonable success of classical convolutional neural networks – equivariance. It states that if the input to the neural network is shifted, then its activations translate accordingly. […]

Speaker: Beata Zjawin(ICTQT, UG) Abstract Observations at astronomical scales provide a strong evidence for existence of dark matter. The nature of dark matter composition, however, is still not known. Lack of detections of dark matter particles triggered multiple alternative theories. In this seminar, I will focus on dark matter candidates in form of scalar fields […]

Speaker: Tanmoy Biswas (ICTQT) Abstract The fluctuation-dissipation theorem is a fundamental result in statistical physics that establishes a connection between the response of a system subject to a perturbation and the fluctuations associated with observables in equilibrium. Here we derive its version within a resource-theoretic framework, where one investigates optimal quantum state transitions under thermodynamic […]

Speaker: Anubhav Chaturvedi (ICTQT) Abstract The predictions of quantum theory resist generalised noncontextual explanations. In addition to the foundational relevance of this fact, the particular extent to which quantum theory violates noncontextuality limits available quantum advantage in communication and information processing. In the first part of this work, we formally define contextuality scenarios via prepare-and-measure experiments, […]

Speaker: John Selby (ICTQT) Abstract In this talk I will discuss some recent work with Thomas D. Galley and Flaminia Giacomini, in which we apply the formalism of generalised probabilistic theories to the study of the nature of the gravitational field. Recently, table-top experiments involving massive quantum systems have been proposed to test the interface […]