On-chip III-V monolithic integration of heralded single photon sources and beamsplitters

TL;DR

This paper reports the successful monolithic integration of a heralded single photon source and beamsplitter on a single III-V chip at room temperature, demonstrating key quantum photonic functionalities for practical quantum information applications.

Contribution

It presents the first monolithic III-V photonic circuit combining a heralded single photon source with a beamsplitter at telecom wavelength and room temperature.

Findings

Heralded second-order correlation g^{(2)}_{her}(0)=0.10 ± 0.02 confirms single-photon operation.

Integrated quantum state generation and manipulation achieved on a single chip.

Operates at telecom wavelength and room temperature, suitable for real-world applications.

Abstract

We demonstrate a monolithic III-V photonic circuit combining a heralded single photon source with a beamsplitter, at room temperature and telecom wavelength. Pulsed parametric down-conversion in an AlGaAs waveguide generates counterpropagating photons, one of which is used to herald the injection of its twin into the beamsplitter. We use this configuration to implement an integrated Hanbury-Brown and Twiss experiment, yielding a heralded second-order correlation $g^{(2)}_{\rm her}(0)=0.10 \pm 0.02$ that confirms single-photon operation. The demonstrated generation and manipulation of quantum states on a single III-V semiconductor chip opens promising avenues towards real-world applications in quantum information.