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Non-Gaussian noise spectroscopy with a superconducting qubit sensor
- Source :
- Nature Communications 10, 3715 (2019)
- Publication Year :
- 2019
-
Abstract
- Accurate characterization of the noise influencing a quantum system of interest has far-reaching implications across quantum science, ranging from microscopic modeling of decoherence dynamics to noise-optimized quantum control. While the assumption that noise obeys Gaussian statistics is commonly employed, noise is generically non-Gaussian in nature. In particular, the Gaussian approximation breaks down whenever a qubit is strongly coupled to discrete noise sources or has a non-linear response to the environmental degrees of freedom. Thus, in order to both scrutinize the applicability of the Gaussian assumption and capture distinctive non-Gaussian signatures, a tool for characterizing non-Gaussian noise is essential. Here, we experimentally validate a quantum control protocol which, in addition to the spectrum, reconstructs the leading higher-order spectrum of engineered non-Gaussian dephasing noise using a superconducting qubit as a sensor. This first experimental demonstration of non-Gaussian noise spectroscopy represents a major step toward demonstrating a complete spectral estimation toolbox for quantum devices.<br />Comment: 21 pages, 12 figures
- Subjects :
- Quantum Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Nature Communications 10, 3715 (2019)
- Publication Type :
- Report
- Accession number :
- edsarx.1903.01043
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1038/s41467-019-11699-4