Sebastien is an expert in the science and engineering of deterministic single-photon sources. He holds a PhD from Imperial College London on the coupling of single organic molecules to photonic micro-structures. Sebastien has a holistic experience in the development of quantum light sources, from the theoretical modelling and cleanroom fabrication to the optical characterisation and photonic packaging. Since joining Quandela in 2020, he has worked to industrialise the production cycle of quantum-dot based single-photon sources and optimise their performances. More recently, he has led the development of Quandela’s pilot-line for the fabrication of these sources and he is currently leading the R&D team conceiving next-generation devices.
Recent progress in the field of semiconductor quantum dots has recently enabled the fabrication of single-photon sources which are bright, pure and indistinguishable . By placing dots in small optical cavities (in our case micropillar cavities), we both maximise the probability that photons are emitted into a single output mode as well as improving the quantum properties of the emission. Furthermore, with exquisite control over the charged-states of quantum dots (where a single electron or hole is trapped inside the dot), we can use the same technology to generate streams of photons which are sequentially entangled to one another . This versatile platform is now reaching a level of maturity to enable many technologies of the 2nd quantum revolution, including photonic quantum computing. In this talk, I will present Quandela’s approach to emitter-based single-photon sources and describe how they are being put to use in the first European photonic quantum computer available on the cloud.
 Bright Polarized Single-Photon Source Based on a Linear Dipole. Phys. Rev. Lett. (2021). https://doi.org/10.1103/PhysRevLett.126.233601
 High-rate entanglement between a semiconductor spin and indistinguishable photons. Nat. Photon. (2023). https://doi.org/10.1038/s41566-023-01186-0