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Profil personnel

Personal profile

After joining École Polytechnique in 2011, where he specialized in condensed matter physics, he obtained a Master's degree in Physics from the Freie Universität Berlin, where he studied the growth of EuS films on InAs and InP substrates.

He then completed his PhD from 2015 to 2018 at the Collège de France in Paris, where he developed a spectrometer based on the Josephson effect in tunnel junctions between two superconductors separated by an insulator. When a DC voltage is applied, a Cooper pair can tunnel through only if it emits a photon with energy proportional to the applied voltage. The absorption of these photons is directly observed in the current-voltage characteristic of the junction as a current peak.

Following this, he undertook a two-year postdoctoral fellowship at the University of Sherbrooke in Quebec. There, he continued to investigate voltage-biased Josephson junctions. By exploiting the non-linearity of a junction, he developed a photomultiplier capable of converting a microwave photon at one frequency into several photons at another frequency. He successfully demonstrated a threefold multiplication of the injected photons.

He joined the QCMX team as a postdoctoral researcher in October 2021 to study Andreev bound states in carbon nanotubes. To observe these states, he plans to use a new two-tone spectroscopy technique that improves upon the one he developed during his PhD.

In September 2022, he was appointed Assistant Professor in the same laboratory, where he is now working on the development of protected superconducting qubits.

Empreinte digitale

Passez en revue plus en détail les thèmes de recherche où Joël Griesmar est actif. Ces libellés thématiques proviennent des travaux de cette personne. Ensemble, ils forment une empreinte digitale unique.
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