Personal profile
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.
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Collaborations and top research areas from the last five years
Research output
- 13 Article
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Aluminum junctions with well-transmitted channels: A platform for higher-harmonic Josephson elements
Griesmar, J., Riechert, H., Peugeot, A., Hantute, M., Annabi, S., Girit, Steffensen, G. O., Yeyati, A. L., Arrighi, E., Bretheau, L. & Pillet, J. D., 1 Dec 2025, In: Physical Review Applied. 24, 6, 064065.Research output: Contribution to journal › Article › peer-review
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Influence of bias-voltage noise on the inelastic cooper-pair tunneling amplifier (ICTA)
Martel, U., Albert, R., Blanchet, F., Griesmar, J., Ouellet, G., Therrien, H., Nehra, N., Bourlet, N., Peugeot, A. & Hofheinz, M., 17 Feb 2025, In: Applied Physics Letters. 126, 7, 074001.Research output: Contribution to journal › Article › peer-review
Open Access -
The carbon nanotube gatemon qubit
Riechert, H., Annabi, S., Peugeot, A., Duprez, H., Hantute, M., Watanabe, K., Taniguchi, T., Arrighi, E., Griesmar, J., Pillet, J. D. & Bretheau, L., 1 Dec 2025, In: Nature Communications. 16, 1, 7197.Research output: Contribution to journal › Article › peer-review
Open Access -
Josephson junctions based on ultraclean carbon nanotubes
Annabi, S., Arrighi, E., Peugeot, A., Riechert, H., Griesmar, J., Watanabe, K., Taniguchi, T., Bretheau, L. & Pillet, J. D., 1 Dec 2024, In: Physical Review Applied. 22, 6, 064035.Research output: Contribution to journal › Article › peer-review
Open Access -
Microwave Photon-Number Amplification
Albert, R., Griesmar, J., Blanchet, F., Martel, U., Bourlet, N. & Hofheinz, M., 1 Jan 2024, In: Physical Review X. 14, 1, 011011.Research output: Contribution to journal › Article › peer-review
Open Access -
Two-Tone spectroscopy of high-frequency quantum circuits with a Josephson emitter
Peugeot, A., Riechert, H., Annabi, S., Balembois, L., Villiers, M., Flurin, E., Griesmar, J., Arrighi, E., Pillet, J. D. & Bretheau, L., 1 Dec 2024, In: Physical Review Applied. 22, 6, 064027.Research output: Contribution to journal › Article › peer-review
Open Access -
Josephson diode effect in Andreev molecules
Pillet, J. D., Annabi, S., Peugeot, A., Riechert, H., Arrighi, E., Griesmar, J. & Bretheau, L., 1 Jul 2023, In: Physical Review Research. 5, 3, 033199.Research output: Contribution to journal › Article › peer-review
Open Access -
Absorptive filters for quantum circuits: Efficient fabrication and cryogenic power handling
Paquette, A., Griesmar, J., Lavoie, G., Albert, R., Blanchet, F., Grimm, A., Martel, U. & Hofheinz, M., 19 Sept 2022, In: Applied Physics Letters. 121, 12, 124001.Research output: Contribution to journal › Article › peer-review
Open Access -
Superconducting on-chip spectrometer for mesoscopic quantum systems
Griesmar, J., Rodriguez, R. H., Benzoni, V., Pillet, J. D., Smirr, J. L., Lafont, F. & Girit, 1 Dec 2021, In: Physical Review Research. 3, 4, A76.Research output: Contribution to journal › Article › peer-review
Open Access -
Transconductance quantization in a topological Josephson tunnel junction circuit
Peyruchat, L., Griesmar, J., Pillet, J. D. & Girit, 29 Mar 2021, In: Physical Review Research. 3, 1, 013289.Research output: Contribution to journal › Article › peer-review
Open Access