Measuring Environmental Quantum Noise Exhibiting a Nonmonotonic Spectral Shape
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2019-01-31 |
| Journal | Physical Review Applied |
| Authors | Y. Romach, A. Lazariev, I Avrahami, F. Kleißler, S. Arroyo-Camejo |
| Institutions | Hebrew University of Jerusalem, Max Planck Institute for Biophysical Chemistry |
| Citations | 12 |
Abstract
Section titled “Abstract”Understanding the physical origin of noise affecting quantum systems is\nimportant for nearly every quantum application. Quantum noise spectroscopy has\nbeen employed in various quantum systems, such as superconducting qubits, NV\ncenters and trapped ions. Traditional spectroscopy methods are usually\nefficient in measuring noise spectra with mostly monotonically decaying\ncontributions. However, there are important scenarios in which the noise\nspectrum is broadband and non-monotonous, thus posing a challenge to existing\nnoise spectroscopy schemes. Here, we compare several methods for noise\nspectroscopy: spectral decomposition based on the Carr-Purcell-Meiboom-Gill\n(CPMG) sequence, the recently presented DYnamic Sensitivity COntrol (DYSCO)\nsequence and a modified DYSCO sequence with a Gaussian envelope (gDYSCO). The\nperformance of the sequences is quantified by analytic and numeric\ndetermination of the frequency resolution, bandwidth and sensitivity, revealing\na supremacy of gDYSCO to reconstruct non-trivial features. Utilizing an\nensemble of nitrogen-vacancy centers in diamond coupled to a high density\n$^{13}$C nuclear spin environment, we experimentally confirm our findings. The\ncombination of the presented schemes offers potential to record high quality\nnoise spectra as a prerequisite to generate quantum systems unlimited by their\nspin-bath environment.\n