Trispectrum reconstruction of non-Gaussian noise

TL;DR

This paper introduces protocols for reconstructing the trispectrum of non-Gaussian noise affecting qubits, enabling detailed characterization of complex noise environments in quantum systems.

Contribution

It develops control pulse protocols to simultaneously reconstruct noise power spectrum and trispectrum, enhancing noise analysis in various qubit platforms.

Findings

Successful reconstruction of noise power spectrum and trispectrum across different coupling strengths.

Protocols are robust and applicable to multiple qubit systems.

Provides a method for detailed noise environment characterization.

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.