Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines cond-mat
Date Lundi 11 Octobre 2021
Heure 13:30
Institut LPENS
Salle Salle Djebar - 29 rue d'Ulm
Nom de l'orateur Lanco
Prenom de l'orateur Loïc
Addresse email de l'orateur
Institution de l'orateur Centre de Nanosciences et de Nanotechnologies, C2N
Titre Controlling the interaction between (single) spins and (single) photons
Résumé The quest for efficient spin-photon interfaces is at the core of many proposals in quantum optics. On the one hand, it would allow developping deterministic spin-photon and photon-photon gates for quantum computing, as well as multi-photon « cluster states » for quantum communications. On the other hand, it would allow implementing interesting fundamental studies on quantum measurement, whereby each photon can be used as a « meter » of the spin system. In this seminar, I will briefly review some systems used for spin-photon coupling, and then focus on the recent progress made in C2N, using charged quantum dots in pillar-based cavities. I will show how a confined electron spin can reverse the polarization state of reflected photons in the Poincaré sphere, and how single detected photons can be used for the Quantum Non-Demolition Measurement of a single spin. I will discuss how the spin dynamics can be influenced by a number of solid-state fluctuations, including the hyperfine interaction between the confined carriers and their nuclear spin environment. Finally, I will discuss some perspectives of our work, for the realization of optimized spin-photon interfaces and their use in various applications.
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