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This Week at Physics

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Events on 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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