| Saturday 4 May 2024 | |
| Events for day: Wednesday 02 November 2016 |
| 11:00 - 12:00 Quantum information biweekly journal club Converting Coherence to Quantum Correlations School NANO SCIENCES Converting Coherence to Quantum Correlations Recent results in quantum information theory characterize quantum coherence in the context of resource theories. Here, we study the relation between quantum coherence and quantum discord, a kind of quantum correlation which appears even in nonentangled states. We prove that the creation of quantum discord with multipartite incoherent operations is bounded by the amount of quantum coherence consumed in its subsystems during the process. We show how the interplay between quantum coherence consumption and creation of quantum discord works in the preparation of multipartite quantum co ... 12:00 - 13:30 Crash Course Fundamentals of Mechanics of Materials Session One School NANO SCIENCES Fundamentals of Mechanics of Materials Mechanics of materials (MOM), also called strength of materials, is a topic which deals with the behavior of solid objects subjected to stresses and strains. The study of strength of materials often refers to various methods of calculating the stresses and strains in structural members, such as beams, columns, and shafts. The methods employed to predict the response of a structure under loading and its susceptibility to various failure modes taking into account the properties of the materials such as their yield strength, ultimate strength, Young's modulus, and Poisson's ratio. ... 13:30 - 15:00 Weekly Seminar Primordial Black Holes Formation from Particle Production during Inflation School ASTRONOMY In this talk I will explain the possibility of primordial black holes (PBH) formation from particle production during inflation. We consider the scalar and the gauge quanta production in inflation models, where in the latter case, we focus in two sectors: inflaton coupled i) directly and ii) gravitationally to a U(1) gauge field. We do not assume any specific potential for the inflaton field. Hence, in the gauge production case, in a model independent way we show that the non-production of DM PBHs puts stronger upper bound on the particle production parameter. Our analysis show that this bound is more stringent than the bounds from the bispec ... 14:00 - 15:00 Weekly Seminar Theory of spin pumping in magnetic graphene School NANO SCIENCES Theory of spin pumping in magnetic graphene The ultimate goal and simultaneously the main challenge of spintronics is the generation and sensing of pure spin currents. During the last few decades, several ways have been proposed and implemented to generate spin currents such as electrical spin injection, optical methods and spin hall effect. Both theory and experiment have revealed that graphene and other related systems can be promising for spintronics applications. The main advantages of these materials rely on their huge controllability as well as very long spin relaxation times inside them. After reviewing the basics of ... 15:00 Weekly Seminar Large Energy Superpositions via Rydberg Dressing School PARTICLES AND ACCELERATORS There are currently many efforts towards demonstrating fundamental quantum effects such as superposition and entanglement in macroscopic systems. One relevant class of quantum states are so-called cat states, i.e. superposition states involving two components that are very different in some physical observable, such as position, phase or spin. Here we propose a method for creating such large superpositions in energy. This is relevant in the context of testing proposed quantum-gravity related energy decoherence. Our method relies on the uniform Kerr-type interaction that can be generated between atoms by weak dressing with a Ryd ... 16:00 - 17:00 Colloquium Seminar Topological phases and phase transitions: the Nobel prize in physics 2016 School NANO SCIENCES Topological phases and phase transitions: the Nobel prize in physics 2016 The nature of different phases of matter is discussed in terms of Landau-Ginzburg symmetry breaking paradigm. Kosterlitz-Thouless phase transition, which breaks the symmetry-breaking formalism, opens the notion of topological phase transitions and topological phases. An explanation of quantum-Hall effect, which is given by Thouless in terms of topological invariants is presented. The one-dimensional counterpart of topological phases is given by Haldane phase of S=1 Heisenberg chain, which is a symme ... |