13-19 June 2015
University of Alberta
America/Edmonton timezone
Welcome to the 2015 CAP Congress! / Bienvenue au congrès de l'ACP 2015!

Improving Physical Models of Qubit Decoherence and Readout

16 Jun 2015, 15:45
30m
CCIS L2-200 (University of Alberta)

CCIS L2-200

University of Alberta

Invited Speaker / Conférencier invité Theoretical Physics / Physique théorique (DTP-DPT) T3-2 Quantum Computation and Communication (DTP-DCMMP-DAMOPC) / Communication et calcul quantique (DPT-DPMCM-DPAMPC)

Speaker

Prof. Bill Coish (McGill University)

Description

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 distinguish between a number of different possible sources of environmental charge flucutations (including tunneling and cotunneling with a continuum band, as well as one- and two-phonon absorption processes). These results can be used to identify and suppress dominant charge-noise dephasing mechanisms in semiconductor nanostructures. I will also briefly discuss some new tricks to enhance the fidelity of generic qubit readouts by understanding the physical dynamics of these systems.

Primary author

Prof. Bill Coish (McGill University)

Presentation Materials

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