Physics and Metaphysics of Wigner’s Friends

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 […]

Speaker: Seungbeom Chin (Sungkyunkwan University, Suwon, Korea) Abstract The indistinguishability of quantum identical particles has been widely used as a resource for the generation of entanglement. In this talk, I discuss the multipartite entanglement generation of identical particles with spatial overlap and internal state rotation, which can be realized as a linear quantum network (LQN) […]