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This Week at Physics

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Events During the Week of March 16th through March 23rd, 2014

Monday, March 17th, 2014

No events scheduled

Tuesday, March 18th, 2014

Atomic Physics Seminar
Role of dissipation and losses in neutral atom based quantum computing
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Dr. Durga Dasari, Aarhus University, Denmark
Abstract: Originally inhomegeneities, decoherence and decay of the atomic systems were minimized in quantum computing proposals so that their effects would not disturb the ideal unitary evolution of the system. Recent works, however, suggest a quite opposite strategy, where inhomegeneities are created on purpose and the system is driven on resonance with short lived states such that it dephases and decays to robust steady states. By suitable use of the interactions, these states can be selected, e.g., as entangled states or states encoding the outcome of a quantum computation. We investigate the coherent effects induced by dissipation and decoherence in neutral atom based quantum computing proposals, for creating robust entangled states and long distance gates.
Host: Saffman
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Wednesday, March 19th, 2014

No events scheduled

Thursday, March 20th, 2014

No events scheduled

Friday, March 21st, 2014

Theory Seminar (High Energy/Cosmology)
Consistency tests of gravity using large scale structure dynamics
Time: 2:00 pm
Place: 5280 Chamberlin Hall
Speaker: Elise Jennings, University of Chicago
Abstract: Future galaxy spectroscopic surveys will make high precision measurements of the clustering of galaxies on scales in excess of 100 Mpc/h. In particular, the distortion of clustering due to the peculiar motions of galaxies and the apparent scale of characteristic features in the galaxy distribution have been proposed as tests of the cosmic acceleration. To obtain meaningful and robust constraints on dark energy, we need to understand any systematics in these measurements. I will present the predictions for redshift space distortions from large volume N-body simulations and discuss the accuracy of current models in recovering the growth rate. In addition I will show predictions of the clustering of dark matter in redshift space in f(R) modified gravity and in quintessence dark energy cosmologies. Due to the size and resolution of these simulations, this is the first time that the nonlinear matter and velocity fields in this class of modified gravity models has been resolved to a high level of accuracy over a broad range of scales. I will also discuss a galaxy infall kinematics model which, in combination with weak lensing measurements, can provide powerful diagnostics of modified gravity.
Host: Jordi Salvadó Serra
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Physics Department Colloquium
No Event--Spring Break
Time: 3:30 pm
Place: 2241 Chamberlin Hall (coffee at 4:30 pm)
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"This Week at Physics" poster: http://www.physics.wisc.edu/twap/posters/2014/2014-03-17.pdf

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