The ubiquitous problem of learning system parameters for dissipative two-level quantum systems: Fourier analysis versus Bayesian estimation

TL;DR

This paper compares Fourier analysis and Bayesian estimation for determining parameters in dissipative two-level quantum systems, demonstrating Bayesian methods' superior accuracy, flexibility, and efficiency across various measurement scenarios.

Contribution

The study shows Bayesian modeling and maximum likelihood estimation outperform Fourier analysis in estimating quantum system parameters, offering higher accuracy and adaptability.

Findings

Bayesian methods yield higher accuracy and precision.

Bayesian approaches require less data and handle uncertainties better.

Bayesian techniques are effective for different noise conditions.

Abstract

We compare the accuracy, precision and reliability of different methods for estimating key system parameters for two-level systems subject to Hamiltonian evolution and decoherence. It is demonstrated that the use of Bayesian modelling and maximum likelihood estimation is superior to common techniques based on Fourier analysis. Even for simple two-parameter estimation problems, the Bayesian approach yields higher accuracy and precision for the parameter estimates obtained. It requires less data, is more flexible in dealing with different model systems, can deal better with uncertainty in initial conditions and measurements, and enables adaptive refinement of the estimates. The comparison results shows that this holds for measurements of large ensembles of spins and atoms limited by Gaussian noise as well as projection noise limited data from repeated single-shot measurements of a single quantum device.