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R. G. Herb Condensed Matter Seminar

Quantum Spins in Nanostructures: Coherence, Measurement, and Collective Dynamics

Date: Thursday, April 23rd

Time: 10:00 am

Place: 5310 Chamberlin Hall

Speaker: Bill Coish, McGill University

Abstract: Qubit coherence measurements are now sufficiently accurate that they can be used to perform 'spectroscopy' of noise due to a complex environment. Measuring not only the decay time, but also the form of decay as a function of some external parameter (e.g. temperature) can determine the nature of the dominant decoherence source. I will describe how temperature-dependent measurements of qubit decoherence time and form of decay can be used to identify microscopic dephasing sources in a semiconductor environment.

I will also briefly discuss some new tricks to enhance the fidelity of generic qubit measurements and prospects for generating and observing genuine collective quantum effects in ensembles of nuclear spins embedded in silicon nanostructures.

Host: Coppersmith

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