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Events on Thursday, September 10th, 2009

R. G. Herb Condensed Matter Seminar
Emulating the dynamics of a quantum spin using a superconducting phase qudit
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Matthew Neeley, University of California - Santa Barbara
Abstract: Quantum computers are typically thought of as being composed of qubits, or two-level quantum systems. However, one can also use qutrits (three-level systems) or general qudits (d-level systems) in quantum information processing, which can simplify certain computational tasks. Like many physical realizations of qubits, the superconducting phase qubit is a quantum system with multiple energy levels that is usually operated as a qubit by restricting it to the lowest two energy states. Here, we relax this restriction and instead use the higher levels to operate this device as a qudit up to d=5. We show how to manipulate and measure the qudit state, and then use it to emulate the dynamics of single spins with principal quantum number s=1/2, 1 and 3/2. In particular, we use this emulation to show the even (odd) parity of integer (half-integer) spins under 2pi rotation.
Host: Robert McDermott
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Introductory Graduate Seminar
Astrophysics I: Astrophysics and cosmology
Time: 5:30 pm
Place: 2223 Chamberlin Hall
Speaker: Faculty, University of Wisconsin Department of Physics
Abstract: Balantekin, Barger, Chung, Halzen, Heeger, Karle, McCammon, Montaruli, Ogelman, Ramsey-Musolf, Timbie, Westerhoff, Zweibel
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