Theory of Two-Qubit T 2 Spectroscopy of Quantum Many-Body Systems
This work develops a two-qubit T2 spectroscopy method to separate environmental response from noise in many-body systems. By using specific pulse sequences, researchers can independently measure symmetric (noise) and antisymmetric (response) correlation functions. This technique reveals how correlations spread in space and time, distinguishing between different transport regimes like ballistic spreading and diffusive broadening.