Job Information
Organisation/Company: CNRS
Department: Laboratoire de Physique
Research Field: Mathematics; History » History of science
Researcher Profile: First Stage Researcher (R1)
Application Deadline: 13 Nov 2026 - 23:59 (UTC)
Country: France
Type of Contract: Temporary
Job Status: Full-time
Hours Per Week: 35
Offer Starting Date: 1 Jan 2027
Is the job funded through the EU Research Framework Programme? Not funded by a EU programme
Is the Job related to staff position within a Research Infrastructure? No
Offer Description
Integration into the 'Quantum Circuits' research group within the Physics Laboratory at ENS de Lyon. Access provided to numerical tools, nanofabrication facilities, and cryogenic equipment.
A quantum memory allows for the simultaneous storage of a large number of quantum states and can reduce the qubit overhead of a quantum processor. Ensembles of electron spins coupled to a resonator are a promising candidate for storing propagating microwave states: spin species with long coherence times ensure durable storage, while an inhomogeneously broadened spectral line allows for the addressing of numerous spectral and temporal modes within a single device. Storage efficiency is determined by the coupling between the ensemble and the superconducting resonator used to address it. The ensembles proposed to date rely on crystalline matrices, in which spin density, the nuclear environment, and geometry are fixed during the growth process.
This project replaces the crystal with a deposited molecular film. The spin is implemented via a molecule: its nuclear environment is defined during synthesis, its concentration is determined by mass, and it is integrated onto a pre-fabricated superconducting chip via drop-casting or spin-coating. This thesis will explore several candidates: perchlorotriphenylmethyl and tetrathiatriarylmethyl (trityl) radicals—which exhibit a narrow spectral line and, when isotopically labeled, an addressable nuclear spin—as well as lanthanide complexes, such as Lu(II) or Yb(III) species, whose hyperfine structure offers "clock transitions." Both families combine the potential for long coherence times with structural properties compatible with strong coupling to a planar resonator.
The work will involve measuring the coherence of the selected candidates at millikelvin temperatures—a regime in which none of them have yet been characterized—as well as their coupling to a low-impedance resonator designed to maximize interaction with the spins. The objective of this thesis is a quantitative assessment of the capacity of these molecular spins to reach the regime required for a microwave quantum memory.
Expected knowledge:
- Physical sciences (superconductivity, low temperatures, experimental setups, magnetic resonance)
- High-frequency microwave engineering
- Nanofabrication
Operational skills:
- Expertise in high-frequency microwave measurements
- Scientific computing
- Software engineering (proficiency in Python, Git)
- Ability to work independently
Where to apply
Website: https://emploi.cnrs.fr/Offres/Doctorant/UMR5672-AUDBIE-012/Default.aspx
Requirements
Research Field: Mathematics
Education Level: PhD or equivalent
Research Field: History
Education Level: PhD or equivalent
Languages: FRENCH
Level: Basic
Research Field: Mathematics
Years of Research Experience: None
Research Field: History » History of science
Years of Research Experience: None
Additional Information
Website for additional job details: https://emploi.cnrs.fr/Offres/Doctorant/UMR5672-AUDBIE-012/Default.aspx
Work Location(s)
Number of offers available: 1
Company/Institute: Laboratoire de Physique
Country: France
City: LYON 07
Contact
City: LYON 07
Website: http://www.ens-lyon.fr/PHYSIQUE/
