Delteil, Aymeric

Date:    Monday, October 16, 2023 
Time:    16:00
Place:    ETH Campus Hönggerberg, HIT F 11.1
Host:     Atac Imamoglu

Towards top-down integrated quantum photonics with colour centres in hexagonal boron nitride

Aymeric Delteil –  Université Paris-Saclay, UVSQ, CNRS, GEMaC, France

Abstract: In the context of quantum photonics with 2D materials, hexagonal boron nitride (hBN) has emerged as a pivotal material, enabling the realisation of compact heterostructures and integrated quantum photonic devices. Moreover, like other wide-gap materials such as diamond, hBN can host deep defects that act excellent single-photon emitters. While most of these colour centres suffer from random emission wavelength and spatial location, we have recently demonstrated a technique for generating quantum emitters in hBN with controlled position and wavelength. The emitters are locally activated in exfoliated hBN single crystals using a focused electron beam, paving the way for top-down integration in nanostructures. They exhibit bright and narrow lines, with high optical coherence and low ensemble distribution. I will present their fabrication technique, their optical properties and coherent control, as well as their Hong-Ou-Mandel indistinguishability. I will also show recent results of deterministic integration into photonic structures. Altogether, the controlled generation of coherent quantum emitters in 2D materials opens appealing perspectives in quantum photonics, with applications in optical quantum information and quantum sensing.