Reconstruction of the wavefunctions of coupled nanoscopic emitters using a coherent optical technique

TL;DR

This paper introduces a coherent optical spectroscopy technique for reconstructing the wavefunctions of coupled nanoscopic emitters, enabling detailed analysis of their interactions beyond traditional far-field methods.

Contribution

It presents a novel quantum state tomography method that disentangles hybrid wave functions into individual emitter wavefunctions using spatially resolved excitation.

Findings

Simulations demonstrate effective removal of undesired resonances.

Method enables detailed coupling analysis in quantum dots.

Applicable to biological systems like photosynthesis pigments.

Abstract

We show that using coherent, spatially resolved spectroscopy, complex hybrid wave functions can be disentangled into the individual wave functions of the individual emitters. This way, detailed information on the coupling of the individual emitters, not available in far-field spectroscopy can be obtained. The proposed quantum state tomography relies on the ability to selectively excite each emitter individually by spatially localized pulses. Simulations of coupled semiconductor Ga/InAs quantum dots, using light fields available in current nanoplasmonics, show that even undesired resonances can be removed from measured spectra. The method can also be applied to study the internal coupling of pigments in photosythesis and artificial light harvesting.