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Circuit quantique hybride couplant un spin électronique à une cavité supraconductrice

Spécialité : ÉLECTRONIQUE ÉLECTRICITÉ / Circuit et composant électroniques

Contact : VION Denis,
e-Mail : denis.vion@cea.fr,   Tel : +33 1 69 08 73 41/55 29
Laboratoire : SPEC/GQ

Stage pouvant se poursuivre en thèse : Oui
Durée du stage : 0-3 mois
Date limite de constitution de dossier : 16/04/2018

Résumé :
Stage de master 2 destiné à être poursuivi par une thèse en cotutelle des universités de Paris-Saclay (France) et de Sherbrooke (Canada). Le but est de coupler un spin électronique unique à une cavité supraconductrice suffisamment fortement pour le manipuler et le détecter, dans deux dispositifs experimentaux différents

Sujet détaillé :
The Quantronics group of CEA-Saclay and the Institut quantique of Sherbrooke University collaborate in a fundamental physics project aiming at coupling a single electronic spin to microwave superconducting cavity. Two approaches will be explored: With Professor M. Pioro-Ladrière from the Institut quantique, the spin-cavité will be mediated by the charge degree of freedom of a semiconducting double quantum dot. The inhomogeneous magnetic field created by a micro-magnet close to the double dot allows one to obtain a spin-cavity coupling of a few MHz, and to choose by design between a purely longitudinal or transverse coupling [1]. The parametric modulation of the longitudinal coupling will be used for a non destructive measurement of the spin using the microwave signal leaking from the cavity [2]. In the Quantronics group, the magnetic coupling between the spin of a single impurety in a crystal and a superconducting cavity will be optimized to reach a characteristic coupling frequency above 1 kHz. Such a coupling should be enough to detect a single electronic spin using a homodyne measurment of the field leaking out of the cavity [3], which would bring ESR to the ultimate sensibility. We thus recruit a Master research intern willing to pursue the internship by a PhD thesis in 2018 in two laboratories located at CEA University Paris-Saclay (18 months) and at Sherbrooke University (18 months).
The intern applicant having a solid background in quantum physics will participate to the ongoing research: design of microwave resonators for coupling to a spin, fabrication and test of these resonators, or ultra-low temperature measurement of hybrid circuits.
The intership is planned at CEA-Saclay, but could also possibly be at the Institut quantique from Sherbrooke if the intern prefers it.

[1] F. Beaudoin, D. Lachance-Quirion, W. A. Coish et M. Pioro-Ladrière, Coupling a single electron spin to a microwave resonator: Controlling transverse and longitudinal couplings, Nanotechnology 27, 464003 (2016).
[2] P. Haikka, Y. Kubo, A. Bienfait, P. Bertet et K. Molmer, Proposal for detecting a single electron spin in a microwave resonator, Physical Review A 95, 22306 (2017).
[3] A. Bienfait et al., Reaching the quantum limit of sensitivity in electron spin resonance, Nature Nanotechnology 11, 253–257 (2016).
Techniques utilisées au cours du stage :
Simulation et conception microonde, salle blanche, mesures électriques à basse température.

Mots clés : circuits quantiques, spins

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