Coherent photon coincidence spectroscopy of single quantum systems

TL;DR

This paper introduces a novel spectroscopy technique using coherent photon coincidence measurements with variable laser pulse delays to probe the internal quantum dynamics of single quantum systems, demonstrated through simulations of quantum dots and coupled emitters.

Contribution

It proposes a new method for non-equilibrium photon correlation spectroscopy that reveals system-specific quantum dynamics in single quantum systems.

Findings

The method can distinguish different quantum systems based on their photon correlation signatures.

Simulations show the technique's ability to access internal quantum states.

It provides a new spectroscopic tool for quantum system analysis.

Abstract

Non-equilibrium photon correlations of coherently excited single quantum systems can reveal their internal quantum dynamics and provide spectroscopic access. Here we propose and discuss the fundamentals of a coherent photon coincidence spectroscopy based on the application of laser pulses with variable delay and the detection of an time-averaged two-photon coincidence rate. For demonstration, two simple but important cases, i.e., an exciton - biexciton in a quantum dot and two coupled quantum emitters, are investigated based on quantum dynamics simulations demonstrating that this nonlinear spectroscopy reveals information specific to the particular single quantum system.