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Dienstag, 20. Januar 2015

Qubit as a spectrometer of the environmental noise

Dr. Lukasz Cywinski, Polish Academy of Sciences, Warsaw, Poland

Sprecher: Dr. Lukasz Cywinski, Polish Academy of Sciences, Warsaw, Poland

Beginn: Dienstag, 20. Januar 2015, 15:00 h

Veranstaltungsort: Walter-Schottky Institut (TUM), Seminarraum S101, Am Coulombwall 4, Garching

Abstract (pdf):
Qubits lose their coherence due to interaction with their environment. This is mostly viewed as an obstacle on the way towards quantum computation. However, one can look at the problem from another perspective: a qubit can be treated as a nanoscale sensor of environmental fluctuations. When it is driven by a sequence of N dynamical decoupling pulses, the measurement of its coherence at different times and different values of N can be used to reconstruct the spectral density of environmental noise. I will outline the theoretical basis for such a method noise spectroscopy, and give a few examples (out of numerous recent results) of its experimental implementations.

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Prof. Dr. Julia W P Hsu, Materials Science and Engineering Erik Jonsson School of Engineering and Computer Science, University of Texas at Dallas (UT Dallas), USA

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