Perfect photon indistinguishability from a set of dissipative quantum emitters

TL;DR

This paper develops a theoretical framework and optimization method to achieve perfect photon indistinguishability from a set of dissipative quantum emitters, enabling high-quality single photon sources at higher temperatures.

Contribution

It introduces an analytical model for indistinguishability in two-emitter systems and uses machine learning to optimize multi-emitter configurations for perfect indistinguishability.

Findings

Analytical expression for indistinguishability I depending on emitter distance.

Optimal emitter configuration achieves perfect I.

Relaxed cavity requirements for practical implementation.

Abstract

Single photon sources (SPS) based on semiconductor quantum dot (QD) platforms are restricted to low temperature (T) operation due to the presence of strong dephasing processes. Despite the integration of QD in optical cavities provides an enhancement of its emission properties, the technical requirements for maintaining high indistinguishability (I) at high T are beyond the state of the art. Recently, new theoretical approaches have shown promising results by implementing two-dipole-coupled-emitter systems. Here, we have developed a theory to estimate I in a two-emitter system with strong dephasing coupled to a photonic cavity. We have obtained an analytical expression for I that predicts the cavity restrictions depending on the distance between the emitters. Furthermore, we develop an alternative interpretation of I which provide insigths for systems with a larger number of emitters. We find the optimal configuration for maximum I in the case of a five-emitter system using a machine-learning optimization procedure which models the Lindblad equation and provides the optimal position of each emitter to maximize I. The optimized configuration provides perfect I while relaxes the cavity requirements to more experimentally accessible values.