Single-Spin Spectrum-Analyzer for a Strongly Coupled Environment
Abstract
A qubit can be used as a sensitive spectrum analyzer of its environment. Here we show how the problem of spectral analysis of noise induced by a strongly coupled environment can be solved for discrete spectra. Our analytical model shows non-linear signal dependence on noise power, as well as possible frequency mixing, both are inherent to quantum evolution. This model enabled us to use a single trapped ion as a sensitive probe for strong, non-Gaussian, discrete magnetic field noise. To overcome ambiguities arising from the non-linear character of strong noise, we develop a three step noise characterization scheme: peak identification, magnitude identification and fine-tuning. Finally, we compare experimentally equidistant versus Uhrig pulse schemes for spectral analysis. The method is readily available to any quantum probe which can be coherently manipulated.
Cite
@article{arxiv.1208.4017,
title = {Single-Spin Spectrum-Analyzer for a Strongly Coupled Environment},
author = {Shlomi Kotler and Nitzan Akerman and Yinnon Glickman and Roee Ozeri},
journal= {arXiv preprint arXiv:1208.4017},
year = {2013}
}