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This Week at Physics

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Events on Thursday, November 17th, 2016

R. G. Herb Condensed Matter Seminar
Measurement of superconducting qubits
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Mostafa Khezri , UC Riverside
Abstract: Superconducting qubits are among the most promising candidates for building a quantum computer. In this talk, we discuss measurement of their most popular flavor, the transmon qubit. In particular, we address the effect of the neighboring qubits on measurement fidelity, introduce dressed squeezed state as an approximation of the joint state of the qubit-resonator system, and also show that non-RWA couplings lead to abrupt qubit state deterioration with increasing measurement microwave power.
Host: Vavilov
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Cosmology Journal Club
An Informal discussion about a broad variety of arXiv papers related to Cosmology
Time: 12:15 pm
Place: 5242 Chamberlin Hall
Abstract: Please visit the following link for more details:
http://cmb.physics.wisc.edu/journal/index.html
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 (aupadhye@wisc.edu).
Host: Amol Upadhye
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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
A novel on-chip, mm-wavelength spectrometer for mapping the high-redshift universe.
Time: 2:30 pm
Place: 5280 Chamberlin Hall
Speaker: Erik Shirokoff, University of Chicago
Abstract: Title: A novel on-chip, mm-wavelength spectrometer for mapping the high-redshift universe.

SuperSpec is an compact on-chip spectrometer for mm and submm wavelength astronomy. Its small size, wide spectral bandwidth, and highly multiplexed detector readout will enable construction of powerful multi-object spectrometers for high-redshift observations. The design employs a filter bank consisting of a series of superconducting thin film circuit elements, each coupled to titanium nitride lumped-element kinetic inductance detector (KID.) I will discuss the design, optimization, and measured performance of our prototype devices, our upcoming observing run with the SuperSpec demonstration camera, and the observations that will become possible with a large multi-object-spectrometer based upon this technology. These future instruments will allow us to characterize thousands of high redshift dusty star forming galaxies and to measure to characterize star formation during the epoch of reionization through tomographic intensity mapping.
Host: Peter Timbie
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Astronomy Colloquium
Bautz Lecture
"Dwarf Galaxies: Fossils of Galaxy Evolution"
Time: 3:30 pm
Place: 4421 Sterling Hall, Coffee and Cookies 3:30 pm, Talk starts at 3:45 pm
Speaker: Professor Eva Grebel, Bautz Lecturer, University of Heidelberg
Abstract: "Dwarf galaxies are the most common type of galaxy in the Universe and include the most dark-matter-dominated objects known. They offer intriguing insights into evolutionary processes at low halo masses and low metallicities. Moreover, as survivors of a once much more numerous population of building blocks of larger galaxies, they are key to understanding very early star formation processes. The Local Group and particularly the Milky Way's dwarf galaxy entourage offer us the unique possibility to compare in detail dwarf and Galactic populations. This is an important step towards quantifying the magnitude and time scales of dwarf contributions to the build-up of the Milky Way and allows us to test predictions of cosmological theories and hierarchical structure formation."
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