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This Week at Physics

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Events During the Week of May 10th through May 17th, 2015

Monday, May 11th, 2015

Plasma Theory Seminar
Resonant 3-D Magnetic Field Effects -- penetration, resistive reconnection, islands, transport
Time: 4:00 pm
Place: 514 ERB
Speaker: Prof. James D. Callen, UW-Madison, Engineering Physics, UW-Madison, Engineering Physics
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Tuesday, May 12th, 2015

R. G. Herb Condensed Matter Seminar
A leakage-resilient approach to topological quantum error correction with superconducting elements
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Joydip Ghosh, University of Calgary
Abstract: Superconducting qubits, while promising for scalability and long coherence times, contain more than two energy levels, and therefore are susceptible to errors generated by the leakage of population outside of the computational subspace. Such leakage errors are currently considered to be a prominent roadblock towards fault-tolerant quantum computing with superconducting qubits. Fault-tolerant quantum computing using topological codes is based on sequential measurements of multi-qubit stabilizer operators. In this talk, I propose a leakage-resilient scheme to perform repetitive measurements of multi-qubit stabilizer operators, and then discuss how to use this scheme as an ingredient to develop a leakage-resilient approach for surface code quantum error correction with superconducting circuits. Our protocol is based on SWAP operations between data and ancilla qubits at the end of every cycle, requiring read-out and reset operations on every physical qubit in the system, and thereby preventing persistent leakage errors from occurring.
Host: Friesen
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Theory Seminar (High Energy/Cosmology)
Naturalness in Supergravity Models: The Higgs Mass and Higgsino Mass
Time: 4:00 pm
Place: 5280 Chamberlin Hall
Speaker: Sujeet Akula, Monash University
Abstract: The minimal supergravity model is deeply affected by the Higgs boson mass measurement, but is not conclusively unnatural. We discuss the implications for the LHC and for direct detection of dark matter which are striking, along with the effect on other physics at the weak scale. Finally, we discuss a new type of model in supergravity grand unification, guided by the currently available data.
Host: Ran Lu
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Wednesday, May 13th, 2015

Department Meeting
Time: 12:15 pm
Place: 5310 Chamberlin Hall
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Thursday, May 14th, 2015

NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Anomalous reactor antineutrino flux and spectrum measurements
Time: 2:30 pm
Place: 5310 Chamberlin Hall
Speaker: Bryce Littlejohn, Illinois Institute of Technology
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Astronomy Colloquium
A "New" Galaxy Formation Mechanism from Joint Galactic and High Redshift Constraints
Time: 3:45 pm
Place: 4421 Sterling Hall
Speaker: Jonathan Bird, Vanderbilt University

Very different data sets guide galaxy formation theory across cosmic history: from the global properties of >10^7 galaxies at high redshift (z>0.5) to the kinematics and chemistry of >10^6 stars here in the Milky Way. Traditional observational and computational limitations have dictated independent study of these two regimes. I will discuss how this picture is changing rapidly and how viewing the MW as important boundary condition on galaxy evolution puts unprecedented demands on galaxy formation theory. In particular, I will discuss a novel disk formation mechanism and its signature in current observations of the Milky Way and the resolved kinematics of high redshift galaxies.

Modern, high-resolution, cosmological galaxy formation simulations reveal that disks can grow ‘upside-down’ in the sense that progressively younger stellar populations are born with increasingly smaller vertical velocity dispersion, tracing the kinematics of the collapsing gas disk from which they form. We find that the upside-down model matches the most stringent observational constraints here in the MW, including the steep stellar age-velocity relationship measured in the solar neighborhood. I will argue that traditional interpretations of disk evolution from MW data contradict evidence from Integral Field Unit observations of high-redshift disk galaxies and must be revised. Our findings suggest that the ‘upside-down’ model is currently the only self-consistent formation mechanism able to match kinematic constraints from z~2 to z~0. I will conclude with preliminary, yet tantalizing, evidence connecting the star formation history of simulated galaxies with their detailed morphology.

Host: Professor Matt Bershady
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Friday, May 15th, 2015

No events scheduled

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