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Physics Conference Room, SB B326
Coffee starts at 12:00 PM and talk starts at 12:15 PM
Sep '14
Mark Hillery  -  Monday, September 8, 2014
ABSTRACT: Quantum optics arose with the invention of the laser.  Early work focussed on developing a quantum theory of the laser and on better understanding the nature of the quantized electromagnetic field.  It was for this latter work that Roy Glauber won the 2005 Nobel Prize in Physics.  The fields produced by nonlinear optical devices also received attention, because of their unusual correlation properties.  In the 1980's two major areas of study were quantum metrology, using nonclassical states of the electromagnetic field to improve the accuracy of measurements, and micromasers and microlasers, optical devices that are pumped by a single atom at a time.  In the 1990's the field split into three parts.  Some researchers turned their attention to the study of Bose-Einstein condensates and related phenomena in matter-wave physics.  Another group pursued the newly emerging field of quantum information, while a third continued with work on mainstream quantum optics.  Today all of these efforts are alive and doing very well, and they have been joined more recently by the study of quantum opto-mechanics.  A broad overview of these trends will be presented as well as more detailed discussions of some selected topics.
Sep '14
Alexei Tsvelik  -  Monday, September 29, 2014
Brookhaven National Laboratory
Oct '14
Lam Hua  -  Monday, October 6, 2014
Columbia University
Oct '14
Sergei Dubovsky  -  Monday, October 20, 2014
Rutgers University
Oct '14
Lea Ferreira dos Santos  -  Monday, October 27, 2014
ABSTRACT: We consider one-dimensional isolated interacting quantum systems that are taken out of equilibrium instantaneously. Three aspects are addressed: (i) the relaxation process, (ii) the size of the temporal fluctuations after relaxation, (iii) the conditions to reach thermal equilibrium. The relaxation process and the size of the fluctuations depend on the interplay between the initial state and the Hamiltonian after the perturbation, rather than on the regime of the system. They may be very similar for both chaotic and integrable systems. The general picture associating chaos with the onset of thermalization is also further elaborated. It is argued that thermalization may not occur in the chaotic regime if the energy of the initial state is close to the edges of the spectrum, and it may occur in integrable systems provided the initial state is sufficiently delocalized.