STAGE Quantum Engineering of Light using Cold Interacting Atoms

Date de mise à jour de l’offre

Young Physics Teams of Collège de France :

The Physics Institute will provide a particularly favourable scientific and technical environment for hosting an incubator for young teams, the fruit of a partnership between the CNRS and the Collège de France. This incubator will be a key element for maintaining the strength of the interdisciplinary physics-chemistry-biology continuum of Collège de France. It aims at providing young researchers with an ideal material and intellectual environment to foster innovative research projects, up to the point of maturity where they will be able to obtain a permanent position in another institution.

Description de la mission

In the field of quantum engineering, which aims at developing complex quantum systems to safely transmit cryptographic keys, accelerate computations, perform ultra-precise measurements or simulate complex physical systems, optical photons play a central role. They can be manipulated in free space at room temperature with easily reconfigurable setups, and their fast dynamics lead to time-efficient experiments retaining the ability to perform spatially- and temporally-resolved singleparticle operations. However, the elements of a quantum system need to interact with each other in a deterministic, coherent way, which photons don’t do easily. This actively studied but still largely open problem is currently a major roadblock for photonic quantum logic, communications, sensing and simulations.
Our team recently built a versatile platform for quantum engineering of light, with the ability to create efficient deterministic photon-photon interactions tunable in range, strength and dimensionality. These interactions are mediated by a cold cloud of Rubidium atoms driven to highly-interacting Rydberg states, trapped inside a “twisted optical resonator with a controllable geometry. Independent control over the resonator’s and the cloud’s parameters should allow this system to manipulate photons propagating in free space or confined inside the resonator, to make the interactions dispersive or dissipative, and to manipulate one or several modes at once.
This platform will be used to test the limits of fundamental no-go theorems in quantum logic, to perform quantum measurements impossible with current techniques, and to generate massively entangled multi-mode states of free propagating light. Above all, it gives us access to a largely unexplored regime where intracavity photons form a strongly correlated quantum fluid, making thissetup is ideally suited for real-time, single-particle-resolved investigations of non-trivial phenomena appearing in condensed-matter systems.

Profil recherché

The M2 internship will aim at optimizing the control of photon-photon interactions via the production of single-photon states, giving the student a comprehensive understanding of the system and allowing him/her to refine the underlying theoretical models. The following PhD project’s first goal will be to produce non-classical “Schrödinger’s cat states of free-propagating light in a deterministic way. We will then investigate the possibility to implement a deterministic two-photon logic gate using this platform, before moving towards a multi-photon, multi-mode regime.

Niveau de qualification requis

Bac + 4/5 et +
  • Employeur
    Young Physics Teams of Collège de France
  • Secteur d’activité de la structure
    Enseignement - Formation - Recherche
  • Effectif de la structure
    De 51 à 250 salariés
  • Type de stage ou contrat
    Stage pour lycéens et étudiants en formation initiale
  • Date prévisionnelle de démarrage
  • Durée du stage ou contrat
    Plus de 4 mois et jusqu'à 6 mois
  • Le stage est-il rémunéré ?
    Oui
  • Niveau de qualification requis

    Bac + 4/5 et +
  • Lieu du stage
    Young Physics Teams of Collège de France, 11 place Marcelin Berthelot,
    75005 PARIS 5E ARRONDISSEMENT
  • Accès et transports
    RER B Luxembourg