Thursday 26 September 2024 |
Events for day: Wednesday 11 October 2017 |
11:00 - 12:00 Quantum information biweekly journal club Digital Quantum Estimation (Continuation) School NANO SCIENCES Digital Quantum Estimation Quantum Metrology calculates the ultimate precision of all estimation strategies, measuring what is their root mean-square error (RMSE) and their Fisher information. Here, instead, we ask how many bits of the parameter we can recover, namely we derive an information-theoretic quantum metrology. In this setting we redefine "Heisenberg bound" and "standard quantum limit" (the usual benchmarks in quantum estimation theory), and show that the former can be attained only by sequential strategies or parallel strategies that employ entanglement among probes, whereas parallel-separable strategies are limit ... 14:00 - 15:30 Weekly Seminar a pipeline for cosmic string detection School ASTRONOMY Cosmic strings are predicted by various theories to have formed early in the Universe and expected to exist till today. Being a potentially powerful probe of the physics of early Universe, different approaches are proposed and applied to search for their signature on the cosmological data, in particular on the cosmic microwave background (CMB) radiation. In this work, we apply a multi-stage pipeline to the CMB maps to boost the chances of the string detectability and put tight constraints on their energy density. We also use tree-based machine learning algorithms to improve the search, through tightening the constraints on the energy density ... 14:00 - 15:00 Weekly Seminar on Combinatorics and Computing School MATHEMATICS Phase transitions in computational problems ... 14:00 - 17:00 Weekly Seminar Operator Algebra and its Applications School MATHEMATICS Quasidiagonal C*-algebras (III). ... 14:00 - 15:00 Weekly Seminar Optomechanical properties of ultracold atoms trapped inside the optical lattice of a cavity School NANO SCIENCES Optomechanical properties of ultracold atoms trapped inside the optical lattice of a cavity In this lecture, I investigate the interaction of light with an ultracold atomic ensemble in the regime where their quantum properties are manifested in the same level. Such an interaction is inherently nonlinear where the root of this nonlinearity is in the mutual matter-light interaction. On the other hand, if the density of the atomic ensemble is high enough, then another kind of nonlinearity manifests itself which is due to the atom-atom interaction. A Bose-Einstein condensate (BEC) trapped inside the optical lattice of a cavity i ... 15:30 - 16:30 Weekly Seminar Echoes From the Abyss: Tentative Evidence for Planck-Scale Structure at Black Hole Horizons School PARTICLES AND ACCELERATORS In classical General Relativity (GR), an observer falling into an astrophysical black hole is not expected to experience anything dramatic as she crosses the event horizon. However, tentative resolutions to problems in quantum gravity, such as the cosmological constant problem, or the black hole information paradox, invoke significant departures from classicality in the vicinity of the horizon. It was recently pointed out that such near-horizon structures can lead to late-time echoes in the black hole merger gravitational wave signals that are otherwise indistinguishable from GR. We search for observational signatures of these echoes in the g ... 16:00 - 17:00 Mathematics Colloquium Infinite Graphs and Matroids School MATHEMATICS Infinite Graphs and Matroids ... 16:00 - 17:00 Monthly Colloquium Holographic fidelity susceptibility School NANO SCIENCES Holographic fidelity susceptibility We will review general idea of gauge/gravity duality and its possible application to the quantum information theory. In this context we will propose a prescription to compute fidelity susceptibility for those theories which have gravitational description. Venue:Farmaniyeh Bldg. Coference Hall ... |