Laboratoire Charles Coulomb UMR 5221 CNRS/UM2 (L2C)


Accueil > Formation > Propositions de stage

Optically-addressable spin qubits in silicon 28

par Christelle EVE - publié le

Context :
Like its classical counterpart, the field of quantum technologies is highly demanding in scalable and low-cost solutions for device fabrication. Silicon, as leader material of the semiconductor industry, constitutes a highly promising platform for developing quantum devices. This interest is strengthened by the possibility of producing high-grade isotopically enriched silicon-28 wafers that provides a vacuum-like environment for quantum systems, guaranteeing their long-lived quantum properties [1]. One challenge for Si-based quantum systems is to interface them with optical photons, in order to enable opportunities for quantum communications. In this context, G-center defects in silicon have recently attracted interest due to their infrared emission, matching the important optical telecommunications wavelength O-band spreading between 1260-1360 nm [2].

Scientific and technical work :
This internship aims at exploring their potential for applications in quantum technologies. The first goal is to investigate individual G-centers in nanophotonic structures based on isotopically purified 28Si samples, as a means of developing integrated single photon sources emitting in the telecommunications wavelength range. The second step will be to assess the potential of G-center defects for storing quantum information.
The project will be developed in strong collaborations with the two other partners of the OCTOPUS ANR project : CEA-Grenoble ant IM2NP-Marseille.
[1] M. Steger et al., “Quantum information storage for over 180s using donor spins in a 28Si "semiconductor vacuum"”, Science 336, 1280 (2012).
[2] C. Beaufils, W. Redjem, E. Rousseau, V. Jacques, A. Yu. Kuznetsov, C. Raynaud, C. Voisin, A. Benali, T. Herzig, S. Pezzagna, J. Meijer, M. Abbarchi, and G. Cassabois, “Optical properties of anensemble of G-centers in silicon”, Phys. Rev. B 97, 035303 (2018).

Relevant publications of the host group
[3] B. Hensen, H. Bernien, A. Dréau, et al., “Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres”, Nature 526, 682 (2015).
[4] A. Dréau, P. Jamonneau, O. Gazzano, S. Kosen, J.-F. Roch, J.R. Maze, and V. Jacques, “Probing the Dynamics of a Nuclear Spin Bath in Diamond through Time-Resolved Central Spin Magnetometry” Phys. Rev. Lett. 113, 137601 (2014).

Contact :
Guillaume CASSABOIS – email : - Tel : 0467143756
Laboratoire Charles Coulomb, Université Montpellier and CNRS, Montpellier
Website :
Thesis possibility after internship : YES – Funding : ANR OCTOPUS project