Pascale Senellart

Chaire annuelle Innovation technologique Liliane Bettencourt (2025-2026)

Collège de France

Année 2025-2026

Colloque : Light-based Quantum Technologies

Pascale Senellart, chaire Innovation technologique Liliane Bettencourt

Colloque - Hugo Defienne : Quantum Imaging with Entangled Photons

Résumé

Entanglement stands as a foundational resource in quantum technologies. Lacking a classical equivalent, it theoretically guarantees superior performance over classical systems, provided it plays a non-trivial role in the underlying process. However, in the field of optical imaging, demonstrating the indispensable nature of entanglement remains a significant challenge. Most current applications rely on optical correlations derived from entangled states - features that can often be emulated by classical sources - rendering entanglement a sufficient, rather than strictly necessary, component.

In this presentation, we explore imaging scenarios where entanglement becomes a critical and non-trivial asset. Specifically, I will discuss recent experimental studies utilizing entangled photon states to image through scattering media, highlighting regimes where quantum entanglement provides a definitive advantage over classical alternatives. And, as a nod to the foundations of quantum mechanics, the presentation will be illustrated with the mandatory pictures of cats!

Hugo Defienne

Hugo Defienne's research focuses on quantum optics, imaging, and complex media. He is a researcher at the CNRS at Sorbonne University in Paris, where he heads the Quantum Imaging Paris group. He completed his doctoral thesis at the Kastler-Brossel Laboratory in Paris, where he studied quantum optics in disordered media. He graduated in 2016 and then turned his attention to quantum imaging in his postdoctoral research at Princeton University and then at the University of Glasgow. He became a lecturer in Glasgow before returning to Paris in 2022 to set up his own group at the CNRS thanks to a grant awarded to early-career scientists by the European Research Council.

Pascale Senellart

Chaire annuelle Innovation technologique Liliane Bettencourt (2025-2026)

Collège de France

Année 2025-2026

Colloque : Light-based Quantum Technologies

Pascale Senellart, chaire Innovation technologique Liliane Bettencourt

Colloque - Anaïs Dréau : Single Color Centers for Silicon-Based Quantum Technologies

Anaïs Dréau

Résumé

Capitalizing on the success of the microelectronics and integrated photonics industries, silicon is the material that has generated the most scientific interest for quantum technologies and offers currently the greatest diversity of integrated quantum systems. Recently, in 2020, a new type of physical systems in silicon has emerged for quantum applications: individual color centers. These fluorescent point defects can be isolated at single defect-scale using low-temperature confocal microscopy, and emit single photons directly at telecom wavelengths, suitable for long-distance propagations in optical fibers. Furthermore, some of these defects are also coupled to an optically detectable electron spin that could be used to store and process quantum information.

Pascale Senellart

Chaire annuelle Innovation technologique Liliane Bettencourt (2025-2026)

Collège de France

Année 2025-2026

Colloque : Light-based Quantum Technologies

Pascale Senellart, chaire Innovation technologique Liliane Bettencourt

Colloque - Hugues de Riedmatten : Quantum Memories for Quantum Networks

Hugues de Riedmatten

Résumé

The distribution of entanglement between the nodes of a quantum network will allow new advances e.g. in long distance quantum communication, distributed quantum computing and quantum sensing. The realization of large-scale quantum networks—also known as quantum internet—will require quantum repeaters to enable quantum communication over distances much longer than the fiber attenuation length. The nodes of a quantum repeater are matter systems that should efficiently interact with quantum light, allow entanglement with photons (ideally at telecommunication wavelengths) and serve as a quantum memory allowing long-lived, faithful and multiplexed storage of entangled quantum bits.