Electrical control of nonlinear quantum optics in a nano-photonic waveguide

TL;DR

This paper demonstrates electrical control over nonlinear quantum optics in a nano-photonic waveguide by embedding a quantum dot, enabling tunable single photon generation and photon-photon interactions crucial for scalable quantum networks.

Contribution

It presents the first demonstration of local electrical tuning and switching of quantum nonlinearity in a waveguide-embedded quantum dot system.

Findings

Achieved 40% transmission extinction controlled by voltage.

Observed voltage-controlled photon bunching indicating nonlinearity.

Demonstrated potential for scalable quantum photonic gates.

Abstract

Local control of the generation and interaction of indistinguishable single photons is a key requirement for photonic quantum networks. Waveguide-based architectures, in which embedded quantum emitters act as both highly coherent single photon sources and as nonlinear elements to mediate photon-photon interactions, offer a scalable route to such networks. However, local electrical control of a quantum optical nonlinearity has yet to be demonstrated in a waveguide geometry. Here, we demonstrate local electrical tuning and switching of single photon generation and nonlinear interaction by embedding a quantum dot in a nano-photonic waveguide with enhanced light-matter interaction. A power-dependent transmission extinction as large as 40$\pm$2% and clear, voltage-controlled bunching in the photon statistics of the transmitted light demonstrate the single photon character of the nonlinearity. The deterministic nature of the nonlinearity is particularly attractive for the future realization of photonic gates for scalable nano-photonic waveguide-based quantum information processing.