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  Measuring environmental quantum noise exhibiting a nonmonotonic spectral shape.

Romach, Y., Lazariev, A., Avrahami, I., Kleißler, F., Arroyo-Camejo, S., & Bar-Gill, N. (2019). Measuring environmental quantum noise exhibiting a nonmonotonic spectral shape. Physical Review Applied, 11(1): 014064. doi:10.1103/PhysRevApplied.11.014064.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-0138-D Version Permalink: http://hdl.handle.net/21.11116/0000-0003-013B-A
Genre: Journal Article

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Romach, Y., Author
Lazariev, A.1, Author              
Avrahami, I., Author
Kleißler, F.2, Author              
Arroyo-Camejo, S.2, Author              
Bar-Gill, N., Author
Affiliations:
1Research Group of Nanoscale Spin Imaging, MPI for Biophysical Chemistry, Max Planck Society, ou_1113579              
2Department of NanoBiophotonics, MPI for Biophysical Chemistry, Max Planck Society, ou_578627              

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 Abstract: Understanding the physical origin of noise affecting quantum systems is important for nearly every quantum application. Quantum-noise spectroscopy has been used in various quantum systems, such as superconducting qubits, nitrogen-vacancy centers, and trapped ions. Traditional spectroscopy methods are usually efficient in measuring noise spectra with mostly monotonically decaying contributions. However, there are important scenarios in which the noise spectrum is broadband and nonmonotonous, thus posing a challenge to existing noise-spectroscopy schemes. Here we compare several methods for noise spectroscopy: spectral decomposition based on the Carr-Purcell-Meiboom-Gill sequence, the recently presented dynamic sensitivity control (DYSCO) sequence, and a modified DYSCO sequence with a Gaussian envelope (gDYSCO). The performance of the sequences is quantified by analytic and numeric determination of the frequency resolution, bandwidth, and sensitivity, revealing a supremacy of gDYSCO to reconstruct nontrivial features. Using an ensemble of nitrogen-vacancy centers in diamond coupled to a high-density C-13-nuclear-spin environment, we experimentally confirm our findings. The combination of the schemes presented offers potential to record high-quality noise spectra as a prerequisite to generate quantum systems unlimited by their spin-bath environment.

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Language(s): eng - English
 Dates: 2019-01-312019-01
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevApplied.11.014064
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Title: Physical Review Applied
Source Genre: Journal
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Pages: 11 Volume / Issue: 11 (1) Sequence Number: 014064 Start / End Page: - Identifier: -