Events at Physics
Events on Thursday, March 3rd, 2016
- R. G. Herb Condensed Matter Seminar
- To a loophole-free test of local realism and beyond.
- Time: 10:00 am
- Place: 5310 Chamberlin Hall
- Speaker: Brad Christensen, University Illinois Urbana-Champaign
- Abstract: A loophole-free Bell test has been sought to conclusively answer a central debate of 20th century physics: can an alternative theory to quantum mechanics (i.e., a local realistic theory) explain entanglement's seemingly nonclassical correlations? Here, we will present the details of our loophole-free Bell test, where we use a high-quality and high-efficiency source of entangled photons to achieve a p-value as low as 5.8 x 10-9 while maintaining space-like separation of all relevant events. Furthermore, we will briefly discuss the generalized theory of nonlocality, which we use to experimentally demonstrate the counterintuitive effect of more nonlocality with less entanglement, present the most nonlocal correlations ever reported and use these correlations to bound the predictability of any post-quantum theory, and achieve quantum correlations requiring the use of complex qubits. From this small sample of measurements, we hope to show the strength of Bell tests in probing current and future theories.
- Host: Mcdermott
- Cosmology Journal Club
- An Informal discussion about a broad variety of arXiv papers related to Cosmology
- Time: 12:15 pm - 1:30 pm
- Place: 5242 Chamberlin Hall
- Abstract: Please visit the following link for more details:
Please feel free to bring your lunch!
If you have questions or comments about this journal club, would like to propose a topic or volunteer to introduce a paper, please email Amol Upadhye (email@example.com).
- Host: Amol Upadhye
- Astronomy Colloquium
- Quantitative Polarimetry: From Star Formation to Cosmological Studies
- Time: 3:15 pm - 5:00 pm
- Place: 4421 Sterling Hall, Coffee and cookies 3:15, Talk at 3:30 PM
- Speaker: Thiem Hoang, CITA
- Abstract: We are entering a golden age of dust polarimetry with numerous CMB experiments (e.g., SPIDER, BICEP/Keck, LiteBIRD) hunting for primordial gravitational waves through B-mode polarization, and a dozen of big instruments designed to elucidate the roles of magnetic fields in star formation through submm/mm polarization (e.g., SOFIA, SMA, ALMA). The correct determination of B-mode signal, as well as reliable understanding of magnetic fields in star formation, are only achieved when we have a quantitative treatment of dust polarization. In this talk, first, I will present our recent works on quantifying the polarization of spinning dust emission and magnetic dust emission. Second, I will present our quantitative theory of grain alignment, physical modeling of dust polarization with our theory, and comparisons with observational data. Then, I will discuss our ongoing efforts to construct an accurate physical modeling of dust polarization needed for reliable component separation in cosmic microwave background polarization experiments. Finally, I will discuss our numerical simulations of dust polarization in molecular clouds, which will shed light on the roles of magnetic fields in star formation.
- Host: Professor Lazarian
- Careers for Physicists
- Careers at Epic
- Time: 4:30 pm - 5:30 pm
- Place: 5280 Chamberlin Hall
- Speaker: Sean Cotter (MS 2008), Epic
- Abstract: Transition from college to career, how he is using his physics major at Epic
- Host: Physics Department