Missions

Coupled quantum dots, so-called quantum dot molecules (QDMs), where two quantum dots are separated by a thin tunnelling barrier, open up the possibility to create qubits based on the singlet-triplet state of two electron spins. These have the advantage over single-spin qubits in that there exists a regime where the singlet-triplet qubit is expected to be resistant both to magnetic and electric field fluctuations, which should lead to a longer spin-coherence time. The potential of quantum dot molecules for quantum technology applications has yet to be fully exploited however due to the stochastic nature of quantum dot growth.
Here, the aim is to develop a robust method to grow quantum dot molecules, and to embed them in charge-controlled and cavity devices to investigate their potential to host qu-bits with long spin coherence time. This work is a collaboration between the molecular beam epitaxy (MBE) team and the quantum optics team in the “Nanostructures: Growth, Quantum effets and Magnetism” group at the INSP, located in the Jussieu campus of Sorbonne University.

Activités

The primary task will be to develop robust and reproducible methods to grow quantum dot molecules by molecule beam epitaxy (MBE), and to test the success of these methods by atomic force microscopy (AFM), and low temperature micro-photoluminescence. An optimised diode structure will then be developed to stabilise the singlet-triplet state formed either by two electrons or by two holes in these QDMs.

Compétences

Required :
• A PhD in materials science or experimental physics or a related domain.
• Solid experience in thin film growth by molecular beam epitaxy
• Experience in clean-room device fabrication
• Basic knowledge in condensed matter physics and in optics
• Ability to work in a team and on collaborative projects

Appreciated:
• Experience in low temperature optical measurements
• Familiarity with a programming language such as Python, Matlab or Labview

Contexte de travail

This project is part of the national Program for Priority Equipment and Research into quantum-light based processors (PEPR Quantique).
The work will be carried out at the Institute of NanoSciences in Paris (INSP) which is part of the science faculty at Sorbonne University, situated in the Jussieu campus in the centre of Paris. TThe post-doc will join the “Nanostructures: Growth, Quantum effets and Magnetism” group at the INSP, which consists of 12 research scientists/lecturers and 4 engineers, working on epitaxy, quantum optics, spintronics and acoustics The INSP hosts several university technical platforms that will be used in this project, including the MBE platform (managed by the host team), the AFM platform and a class 1000 cleanroom.

Le poste se situe dans un secteur relevant de la protection du potentiel scientifique et technique (PPST), et nécessite donc, conformément à la réglementation, que votre arrivée soit autorisée par l'autorité compétente du MESR.