CE47 - Technologies quantiques

Wavelength-tunable nanowire-based quantum light source – SONATE

Submission summary

A semiconductor quantum dot (QD) inserted in a nanowire (NW) is an ideal platform for quantum light sources emitting single photons or entangled photon pairs with high brightness.
Two major bottlenecks prevent semiconductor QD from further large-scale integration: 1) QDs formed via a self-assembled process never emit light exactly at the same wavelength and , 2) The fine structure splitting of the exciton which destroys the entanglement of the photon pairs. The central objective of the SONATE project is to solve these issues by creating wide-range wavelength-tunable single photon sources in the telecom band on silicon substrates without fine structure splitting. Our strategy will rely on a hybrid nano-device: a core III-V semiconductor QD-NW embedded in a phase change material (PCM) shell. An in-situ laser-induced phase control of the PCM will be performed to modify the PCM volume, induce a strain on the QD-NW core and, therefore, tune the QD emission. In this project we will target three objectives: 1) Demonstrate an in-situ wavelength-tunable (> 100 meV) single photon source emitting in the telecom band and monolithically grown on Si. 2) Demonstrate that we can tune the emission energy of a single QD-NW with an in operando approach to reach a desired QD emission energy and put this QD in resonance with a second QD-NW. 3) Cancel the fine structure splitting by inducing an asymmetric strain in the QD to produce entangled photon pairs.
The consortium gathers four partners: the Institut des Nanotechnologies de Lyon (INL), the Institut Néel, the Laboratoire PHotonique ELectronique et Ingénierie QuantiqueS (PHELIQS) and the Institut Lumière Matière (iLM). This partnership provides complementary resources and skills required for the success of the project relying on a well-established know-how on the epitaxy of QD-NWs, elaboration of PCM, simulation tools and characterization tools to perform optical measurements in cryogenic environment or under high hydrostatic pressure.

Project coordination


The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.


PHELIQS Photonique Electronique et Ingénierie Quantiques
NEEL Institut Néel

Help of the ANR 589,807 euros
Beginning and duration of the scientific project: December 2023 - 48 Months

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