Measuring environmental quantum noise exhibiting a non-monotonous spectral shape

Abstract

Understanding the physical origin of noise affecting quantum systems is important for nearly every quantum application. Quantum noise spectroscopy has been employed in various quantum systems, such as superconducting qubits, NV 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 non-monotonous, 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 (CPMG) 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 non-trivial features. Utilizing an ensemble of nitrogen-vacancy centers in diamond coupled to a high density ${}^{13}$C nuclear spin environment, we experimentally confirm our findings. The combination of the presented schemes 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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Cited by in corpus (9)

• Sensitivity Optimization for NV-Diamond Magnetometry
• Single-molecule Scale Magnetic Resonance Spectroscopy using Nitrogen-Vacancy Centers in Diamond
• Diamond surface engineering for molecular sensing with nitrogen-vacancy centers
• Using deep learning to understand and mitigate the qubit noise environment
• The dynamical-decoupling-based spatiotemporal noise spectroscopy
• All-optical noise spectroscopy of a solid-state spin
• Characterizing spin-bath parameters using conventional and time-asymmetric Hahn-echo sequences
• Random Pulse Sequences for Qubit Noise Spectroscopy
• Characterizing the magnetic noise power spectrum of dark spins in diamond