STAGE Offre de stage : Electrically driven quantum light sources @ Room T

The generation of nonclassical states of light in miniature chips is a crucial step toward practical implementations of future quantum technologies. For the sake of practicality and scalability, these quantum sources should be easily produced, operate at room temperature, and be electrically excited and controlled. The QITe team is a world leader in the research on AlGaAs-based quantum photonic devices. Indeed this platform presents a strong case for the miniaturization of different quantum components in the same chip: strong second order nonlinearity and electro-optic effect, direct bandgap, generation of entangled photons in the telecom band [1-4].

QITe team demonstrated the first electrically injected twin photons source operating at room temperature (Fig a) [2]; in this project we will push further the capabilities of our devices:

- we will investigate and engineer the quantum properties of the emitted bi-photon state under electrical injection. Preliminary characterizations show that the signal to noise ratio should allow demonstrating a high quality entangled state leading to the violation of Bell inequalities (Fig b).

- we will explore the possibility to develop quantum photonic circuits with new functionalities exploiting the electro-optics effect to manipulate the generated quantum states.

- we will exploit the cavity effects dues to facets reflectivity to generate frequency entangled qudits (i.e. quantum units of information that may take any of d states).