Theoretical study of a mechanical qubit in suspended graphene (M/F)

Job Description

Missions

Coherence time is a key parameter for evaluating the performance of a quantum bit. We have recently proposed a new type of qubit where information is stored in the mechanical displacement of a carbon nanotube, exploiting its coupling with a two-level electronic system to induce sufficiently strong anharmonicity, thereby enabling its manipulation and readout. To benefit from a more intense electromechanical coupling, we now aim to study the coupling between the mechanical modes of suspended bilayer graphene and the quantum dots that can be formed within it. Bilayer graphene offers a major advantage over monolayer graphene: it allows for the precise design of quantum dots while retaining the exceptional mechanical properties of graphene. The electronic structure of bilayer graphene has been the subject of extensive study in recent years, revealing a rich internal physics with valley and spin degrees of freedom. Notably, it has been demonstrated that qubits with extremely long coherence times—up to 30 seconds—can be observed in this system. However, their manipulation remains a major challenge.
The recruited postdoctoral researcher will theoretically investigate how to exploit the deformation of a mechanical oscillator to create a new type of mechanical qubit. This project will involve collaboration with two experimental groups.
The successful candidate must hold (or be about to defend) a PhD in theoretical physics, ideally with expertise in one of the following areas: quantum mechanical systems, condensed matter physics, or quantum optics. A strong interest in gaining a deep understanding of physical phenomena, as well as a curiosity for the theoretical challenges related to quantum technologies, will be major assets. A willingness to engage in close collaboration with experimental teams will complete the profile.
The contract start date is flexible and can be postponed until the end of 2026, depending on the needs of the selected candidate.

Activity

Theoretical physics

Your Profil

Skills

Open quantum systems, condensed matter theory

Your Work Environment

This project is part of the European program HORIZON-EIC-2025-PATHFINDEROPEN MECH-QUBIT(MECHanical QUBIT With Enhanced Coherence), conducted in close collaboration with the experimental teams of Adrian Bachtold (ICFO, Spain) and Christoph Stampfer (RWTH Aachen, Germany). The recruited researcher will join the Laboratoire Ondes et Matière d'Aquitaine (LOMA) in Bordeaux, within the condensed matter theory team. They will work in a dynamic environment where several researchers are active in related areas of quantum technologies. This setting will provide a stimulating scientific framework, ideal for exploring the synergies between theory and experiment in this innovative field.

Compensation and benefits

Compensation

between 3041€ and 3467€ gross monthly salary, depending on experience.

Annual leave and RTT

44 jours

Remote Working practice and compensation

Pratique et indemnisation du TT

Transport

Prise en charge à 75% du coût et forfait mobilité durable jusqu’à 300€

About the offer

About the CNRS

The CNRS is a major player in fundamental research on a global scale. The CNRS is the only French organization active in all scientific fields. Its unique position as a multi-specialist allows it to bring together different disciplines to address the most important challenges of the contemporary world, in connection with the actors of change.

CNRS

The research professions