IPM Calendar 
Thursday 28 March 2024   Today  
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 ...