Lossless resilient microwave components based on disordered superconductors H/F

Job title:

Lossless resilient microwave components based on disordered superconductors H/F

Company:

Commissariat à l’Énergie Atomique

Job description

Entité de rattachement Le CEA est un acteur majeur de la recherche, au service des citoyens, de l’économie et de l’Etat.Il apporte des solutions concrètes à leurs besoins dans quatre domaines principaux : transition énergétique, transition numérique, technologies pour la médecine du futur, défense et sécurité sur un socle de recherche fondamentale. Le CEA s’engage depuis plus de 75 ans au service de la souveraineté scientifique, technologique et industrielle de la France et de l’Europe pour un présent et un avenir mieux maîtrisés et plus sûrs.Implanté au cœur des territoires équipés de très grandes infrastructures de recherche, le CEA dispose d’un large éventail de partenaires académiques et industriels en France, en Europe et à l’international.Les 20 000 collaboratrices et collaborateurs du CEA partagent trois valeurs fondamentales :

• La conscience des responsabilités
• La coopération
• La curiosité

Référence 2025-35179Description de l’unitéThe Fundamental Research Department conducts outstanding research in the fields of physics, chemistry, biology, climate and environmental sciences.
Our research group (www.lateqs.fr), hosted at CEA Grenoble, is part of the French national “Plan Quantique” and closely collaborates with in-house theory colleagues. The lab is located on a big scientific campus gathering not only CEA with its strong microelectronics research (300 mm clean room) but also other major scientific institutions such as CNRS (Institut Néel), ERSF (synchrotron), ILL (neutron source) and many high-tech companies as well as the University Grenoble Alpes.
Grenoble is a vibrant city offering many cultural activities, lovely bars and delicious restaurants. Located in the heart of the Alps it is the paradise for all outdoor enthusiasts.Description du posteDomainePhysique de l’état condensé, chimie et nanosciencesContratPost-doctoratIntitulé de l’offreLossless resilient microwave components based on disordered superconductors H/FSujet de stageLossless resilient microwave components based on disordered superconductorsDurée du contrat (en mois)24Description de l’offreDuring the last decades, superconducting quantum circuits have shown impressive results fueled by the so-called circuit Quantum ElectroDynamics (cQED) architecture where the quantum signal is carried by photons at microwave frequencies. cQED experiments often rely on the technology of aluminum Josephson Junctions (JJ’s) which can be understood as non-linear inductors. This non-linearity allowed the development of numerous non-linear lossless microwave components (tunable resonators [1], low noise amplifier [2] …) which became essential tools for state-of-the-art cQED experiments. Yet, as a consequence of being built upon aluminum JJ’s, all of these components are restricted to low magnetic field ≲ 250mT, temperature ≲ 250mK and frequency ≲ 10 GHz, strongly limiting the range of their application. The use of disordered superconductors with a large superconducting gap such as NbN would alleviate these constraints by one order of magnitude.The goal of the project is to demonstrate that the non-linearity of large gap disordered superconductors, here NbN, can advantageously replace Al JJ’s in order to offer lossless microwave components to research communities working at large magnetic field [3] ∼ 6 T, temperature ∼ 4 K and frequency ∼ 100 GHz.[1] Appl. Phys. Lett. 92, 203501, 2008[2] Appl. Phys. Lett. 118, 142601, 2021[3] Appl. Phys. Lett. 118, 054001, 2021Profil du candidatPostDoc candidates are required to have a Ph. D. degree in physics or a related discipline (electrical engineering, nanosciences, …). The successful candidate will bring a strong background in some of the following areas: superconducting quantum circuit, superconducting qubits, device nanofabrication, cryogenic experiments, experiment control and data acquisition. Strong python programming knowledge is a clear asset. French language proficiency is not necessary. The candidate will work within a team of researchers and will advise graduate and undergraduate students in their research projects.How to apply:To apply, please contact Étienne Dumur by email (etienne.dumur@cea.fr) including:– a curriculum vitae (including prior research experience and skills acquired as well as names of potential referees)– your academic records (Master’s and PhD diploma)– a list of publications– a short statement of your research interest and how it relates to the projectEnglishFrench language proficiency is not necessaryLocalisation du posteSiteGrenobleLocalisation du posteFrance, Auvergne-Rhône-Alpes, Isère (38)VilleGrenobleCritères candidatLanguesAnglais (Courant)Possibilité de poursuite en thèseNonDemandeurDisponibilité du poste01/06/2025

Expected salary

Location

Isère

Job date

Sat, 01 Feb 2025 05:18:17 GMT

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