Photon noise suppression by a built-in feedback loop

TL;DR

This paper introduces a built-in feedback mechanism using charge carrier dynamics in a quantum dot system to significantly reduce photon noise, enhancing the quality of single photon sources for quantum photonic networks.

Contribution

It presents a novel, integrated stabilization approach that suppresses photon noise by nearly 50% using charge carrier dynamics, without external feedback systems.

Findings

Photon noise reduced by nearly 50% (6 dB) in the developed structure.

Effective noise suppression up to 1 kHz frequency.

Built-in feedback offers a scalable solution for large quantum photonic arrays.

Abstract

Visionary quantum photonic networks need transform-limited single photons on demand. Resonance fluorescence on a quantum dot provides the access to a solid-state single photon source, where the environment is unfortunately the source of spin and charge noise that leads to fluctuations of the emission frequency and destroys the needed indistinguishability. We demonstrate a built-in stabilization approach for the photon stream, which relies solely on charge carrier dynamics of a two-dimensional hole gas inside a micropillar structure. The hole gas is fed by hole tunneling from field-ionized excitons and influences the energetic position of the excitonic transition by changing the local electric field at the position of the quantum dot. The standard deviation of the photon noise is suppressed by nearly 50 percent (noise power reduction of 6 dB) and it works in the developed micropillar structure for frequencies up to 1 kHz. This built-in feedback loop represents an easy way for photon noise suppression in large arrays of single photon emitters and promises to reach higher bandwidth by device optimization.