Papiers invités

Sukhdeep S. Dhillon
Laboratoire de Physique de l’Ecole Normale Supérieure (LPENS), Paris

Layered Controlled Terahertz Photonics with 2D Transition Metal Dichalcogenides
In this presentation, I will provide an overview of the application of two-dimensional (2D) Transition Metal Dichalcogenides (TMDs) to terahertz (THz) photonics. I will encompass the significant advancements in these 2D materials, focusing on how the achievement of high-quality, large-area growth is starting to open up novel prospects for THz physics and applications. In particular, I will concentrate on the layer controlled bandstructure of these TMD materials, which can be controlled and engineered for a wide range of physical phenomena – from semiconducting, semimetal, giant nonlinearities to ferroelectric properties – simply by controlling the number of atomic layers and the interlayer interaction. Finally, I will present some recent results on the utilization of 
Group-10 2D TMDs, such as PtSe2, in the realms of nonlinear THz valleytronics and THz spintronics, demonstrating how their layered controlled electronic and photonic properties introduces novel functionalities to these domains. Lastly, I will discuss the potential of 2D materials in impacting the field of THz technology.


Mathieu Bertrand
Thales Alenia Space, Toulouse

Polarisation control in space-based Quantum Information Networks applications
Quantum Information Networks (QIN) are emerging as a way to interconnect quantum devices such as quantum computer, quantum sensors and quantum-secured terminals. These technologies already allow ground-breaking applications such as Quantum Key Distribution (QKD), and ever more powerful ones tomorrow such as blind quantum computing or networks of atomic clocks. For long distances optical connections in QIN, satellites will become mandatory as the losses are only quadratic with the altitude compared to the exponential losses experienced in optical fibres. As shown by the Chinese QUESS and Japanese SOTA missions, polarisation is a well preserved variable for space-based QIN applications. In this paper, we study polarisation control both with free-space and fibre-based technologies for on-board and ground quantum optical devices.