Quantum Speedup 2021

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) […]

Speaker: Dario Tamascelli  (Milan University / Ulm University) Abstract We present the state of the art of TEDOPA (Time Evolving Density operator with Orthogonal PolynomiAls), a numerically exact simulation method for open quantum systems interacting with structured baths. We show how, by exploiting the chain mapping of the bath modes, TEDOPA is able to unleash the […]

Speaker: Gian Marcello Andolina (ICFO) Abstract In this talk I will review the concept of "quantum batteries": quantum systems where energy is stored and from which work can be extracted. I will focus on many-body batteries, systems composed by N identical quantum cells. In this context, I will discuss the relation between extractable work, charging power […]

Speaker: Katarzyna Roszak (Wrocław University of Science and Technology) Abstract We analyze the relationship between qubit-environment entanglement that can be created during the pure dephasing of the qubit and the effectiveness of the spin echo protocol. We focus here on mixed states of the environment. We show that while the echo protocol can obviously counteract classical environmental […]

Speaker: Grigoris Anastasiou 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 […]