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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. |
