Quantum Process Tomography by 2D Fluorescence Spectroscopy

TL;DR

This paper introduces a method for quantum process tomography using 2D fluorescence spectroscopy, enabling sensitive reconstruction of quantum dynamics in energy transfer systems while being insensitive to certain parameters.

Contribution

It presents a novel protocol for quantum process tomography based on 2D-FS with phase modulation, enhancing sensitivity and robustness against specific parameters.

Findings

Reconstruction of quantum dynamics is insensitive to the quantum yield parameter.

The method enhances sensitivity in quantum process tomography.

Applications to foundational and practical problems are discussed.

Abstract

Reconstruction of the dynamics (quantum process tomography) of the single-exciton manifold in energy transfer systems is proposed here on the basis of two-dimensional fluorescence spectroscopy (2D-FS) with phase-modulation. The quantum-process-tomography protocol introduced here benefits from, e.g., the sensitivity enhancement ascribed to 2D-FS. Although the isotropically averaged spectroscopic signals depend on the quantum yield parameter $\Gamma$ of the doubly-excited-exciton manifold, it is shown that the reconstruction of the dynamics is insensitive to this parameter. Applications to foundational and applied problems, as well as further extensions, are discussed.