Measurement of the Noise Spectrum Using a Multiple-Pulse Sequence

Details Measurement of the Noise Spectrum Using a Multiple-Pulse Sequence Measurement of the Noise Spectrum Using a Multiple-Pulse Sequence

2011-05-09

arxiv.org/abs/1105.1594v2

PRL 107, 170504 (2011)

Physics

Quantum Physics

8 pages (4 pages + 4 pages Supplemental material), 1 figure

Scientific paper

A method is proposed for obtaining the spectrum for noise that causes the phase decoherence of a qubit directly from experimentally available data. The method is based on a simple relationship between the spectrum and the coherence time of the qubit in the presence of a pi-pulse sequence. The relationship is found to hold for every system of a qubit interacting with the classical-noise, bosonic, and spin baths.

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