# Controlling Coherent Quantum Dot Interactions

## TL;DR

This paper demonstrates a novel spectroscopic technique to measure and control many-body interactions in quantum dots, enabling precise manipulation of quantum state coupling for potential quantum information applications.

## Contribution

It introduces a collinear four-wave-mixing spectroscopy scheme and a method to enhance and control quantum dot interactions via a prepulse.

## Key findings

- Enhanced many-body interactions with a prepulse tuned to quasi-continuum states
- Phase-resolved measurement of few-state interactions in a diffraction-limited spot
- Proposal of a new control method for quantum state coupling

## Abstract

We measure many-body interactions in isolated quantum dot states using double-quantum multidimensional coherent spectroscopy. Few states are probed in a diffraction limited spot, which is enabled by a novel collinear scheme in which radiated four-wave-mixing signals are measured with phase resolution. Many-body interactions are enhanced by an additional prepulse tuned to the delocalized quasi-continuum states. We propose this effect as a method for controlling coupling between quantum states.