Trispectrum reconstruction of non-Gaussian noise

Abstract

Using a qubit to probe non-Gaussian noise environments is theoretically studied in the context of classical random telegraph processes. Protocols for control pulses are developed to effectively scan higher noise correlations, offering valuable information on the charge environment of the qubit. Specifically, the noise power spectrum and trispectrum are reconstructed simultaneously for a wide range of qubit-fluctuator coupling strengths, demonstrating the method's robustness. These protocols are readily testable in various qubit systems with well-developed quantum control, including quantum dot spins, superconducting qubits and NV centers in diamond.

13 pages, 7 figures

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• Noise Sensing via Stochastic Quantum Zeno
• Resource-efficient digital characterization and control of classical non-Gaussian noise
• Measuring trajectories of environmental noise
• Spectroscopy of classical environmental noise with a qubit subjected to projective measurements
• Quantum Control Noise Spectroscopy with Optimal Suppression of Dephasing
• Noise Detection with Spectator Qubits and Quantum Feature Engineering
• Relationship between subjecting the qubit to dynamical decoupling and to a sequence of projective measurements
• SPAM-Robust Multi-axis Quantum Noise Spectroscopy in Temporally Correlated Environments
• Nonergodic measurements of qubit frequency noise
• Digital noise spectroscopy with a quantum sensor
• Open-loop quantum control of small-size networks for high-order cumulants and cross-correlations sensing
• Efficient learning and optimizing non-Gaussian correlated noise in digitally controlled qubit systems