Doctorat (M/F) - circuits quantiques hybrides

id="offer-description" class="ecl-u-type-heading-2 ecl-u-mt-none ecl-u-mb-l">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 iso