Quantum technology – Qubits and quantum emitters – Quantum emitters based on a new generation of colloidal nanocrystals


Thierry Barisien, Frederick Bernardot, Laurent Legrand, Maria Chamarro, Christophe Testelin, Alex W. Chin

Semiconductor nanocrystals synthesized in solution by chemical processes are currently attracting a great deal of attention because they can be produced at low cost and exhibit exceptional optical properties that are not necessarily shared by their epitaxially grown counterparts. The high versatility associated with the chemical route also offers realistic prospects for the use of these nanoparticles in devices, including easy integration into photonic structures and photonic circuits. The Phocos group at INSP has launched a research program dedicated to the study of perovskite emitters that were rediscovered at the nanoscale only a few years ago. The studies aim at acquiring a fine understanding of the fundamental electronic, optical and magneto-optical properties of systems with various dimensions (dots, wires, wafers). Particular attention is given to the relationship between structural and environmental parameters (crystal symmetries, confinement level, shape anisotropy, dielectric confinement, charge state, etc.) and the fine structure of band edge excitons in order to be able to characterize and optimize a single crystal quantum “platform” and to be able to couple it efficiently to nanoguides or cavities. Dynamic properties (relaxation rates, multiexcitonic processes) as well as temporal coherence are complementary facets also explored by the team. At present, our studies are mainly focused on all-inorganic ternary metal-halide perovskite materials. The development of bright quantum sources with high repetition rate and “high” temperature operation capabilities, as well as their integration into larger quantum systems, are among the priority issues.

Keywords: Quantum emitters, Exciton fine structure, Nanophotonics, Perovskite nanocrystals.

Caption: Microphotoluminescence spectroscopy of a single CsPbBr3 nanocrystal (emission spectrum and polarization diagram).



  • ANR IPER-Nano2 contract, 2018-2022 (Coordinator: M. Chamarro, INSP)




  • Optoelectronics of Confined Nanomaterials team, E. Lhuillier (Physicochemistry and surface dynamics team)

Outside INSP

  • Nano Optics team, C. Diederichs, C. Voisin, Y. Chassagneux (LPENS – CNRS/Sorbonne University)
  • Nano-Optics and Quantum Fluids of Light teams, Q. Glorieux & A. Bramati (Quantum Optics Group, LKB – CNRS/Sorbonne University)
  • Team Physics Department, Laboratory of Physics of Materials, K. Boujdaria (Faculty of Sciences of Bizerte)
  • Team Quantum Electronics, P. Plochocka (LNCMI, Toulouse)



  • Julien Ramade, Léon Marcel Andriambariarijaona, Violette Steinmetz, Nicolas Goubet, Laurent Legrand, et al.. Fine structure of excitons and electron–hole exchange energy in polymorphic CsPbBr 3 single nanocrystals. Nanoscale, Royal Society of Chemistry, 2018, 10 (14), pp.6393 – 6401. ⟨10.1039/C7NR09334A⟩. ⟨hal-01772283⟩
  • R. Ben Aich, I. Saidi, S Ben Radhia, K. Boujdaria, T. Barisien, et al.. Bright-exciton splittings in inorganic cesium lead halide perovskite nanocrystals. Physical Review Applied, American Physical Society, 2019, 11 (3), pp.034042. ⟨10.1103/PhysRevApplied.11.034042⟩. ⟨hal-02169389⟩
  • Michał Baranowski, Krzysztof Galkowski, Alessandro Surrente, Joanna Urban, Łukasz Kłopotowski, et al.. Giant Fine Structure Splitting of the Bright Exciton in a Bulk MAPbBr 3 Single Crystal. Nano Letters, American Chemical Society, 2019, 19 (10), pp.7054-7061. ⟨10.1021/acs.nanolett.9b02520⟩. ⟨hal-02390086⟩
  • R. Ben Aich, S. Ben Radhia, K. Boujdaria, M. Chamarro, C. Testelin. Multiband k·p Model for Tetragonal Crystals: Application to Hybrid Halide Perovskite Nanocrystals. Journal of Physical Chemistry Letters, American Chemical Society, 2020, pp.808-817. ⟨10.1021/acs.jpclett.9b02179⟩. ⟨hal-02454958⟩
  • Michal Baranowski, Paulina Plochocka, Rui Su, Laurent Legrand, Thierry Barisien, Frederick Bernardot, Qihura Xiong, Christophe Testelin, and Maria Chamarro. Exciton binding energy and effective mass of CsPbCl3: a magneto-optical study. Photonics ResearchVol. 8, Issue 10, pp. A50-A55 (2020) https://doi.org/10.1364/PRJ.401872