STAGE Rare-earth doped crystals for quantum nanophotonics

Date de mise à jour de l’offre

Institut de Recherche de Chimie Paris, Chimie ParisTech, :

Chimie ParisTech - PSL dispense une formation d’excellence originale et complète, du bachelor au doctorat, tout en menant une recherche de pointe couvrant l’ensemble du spectre de la chimie. Classée avec l’Université PSL à la 36e place du classement de Shanghai 2020 (ARWU), et à la 46e du classement mondial des universités 2021 (THE), l’école forme des ingénieurs chimistes généralistes dotés d’un sens de l’innovation aigu. Chimie ParisTech - PSL développe de nombreux partenariats industriels et académiques tant au niveau national qu’international.

Description de la mission

Rare-earth (RE) doped crystals are actively investigated
for quantum technologies because of their long-lived optical and spin
quantum states. This unique property in the solid-state enables building
high-performance quantum light-matter interfaces which find applications as
quantum memories for light or optically controlled quantum processors.
Recently, a strong interest arose for coupling RE doped crystals to
nanophotonic structures to enhance light-matter interaction, leading to
demonstrations of single ion detection and control. However, nanoscale
structures often suffer from shorter quantum state lifetimes (dephasing)
compared to bulk materials because of additional perturbations. The latter
can be related to defects created during synthesis or RE proximity to surface
and can be of magnetic or electric origins.
In this project, we will explore different
strategies to mitigate dephasing in one of the
most promising RE ion: Yb3+. Magnetic
perturbations are due to spins fluctuating
between up and down orientations and can be
reduced by polarizing spins under high
magnetic field at ultra-low temperatures, using
specific Yb3+ isotopes or in crystals with low
spin concentrations. Moreover, electric perturbations effects are much
reduced when Yb3+ enter crystallographic sites with high symmetry. These
approaches will be studied in crystals with different spin content and site
symmetries, Yb:Y2SiO5, Yb:CaWO4, Yb:Y2O3, to assess their efficiencies.
Optical quantum state lifetimes will be measured by high-resolution laser
spectroscopy at low temperature and under magnetic fields. In particular,
properties at ultra-low temperatures (20 mK) will be investigated, a regime
which has received little attention up to now. These results will be analysed
in view of transitions sensitivities to electric and magnetic fields. Finally, the
potential of the different systems as platforms for quantum nanophotonics
will be evaluated.

Profil recherché

M2

Niveau de qualification requis

Bac + 4/5 et +
  • Employeur
    Institut de Recherche de Chimie Paris, Chimie ParisTech,
  • 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
    11, rue Pierre et Marie Curie
    75005 PARIS 5E ARRONDISSEMENT
  • Accès et transports
    https://www.chimieparistech.psl.eu/acces-contact/