Experience

Chipiron

• France
• Medical Equipment Manufacturing
• 1 - 100 Employee

• Quantum Sensing Engineer

  • Dec 2022 - Present



National Institute of Standards and Technology (NIST)

• United States
• Research Services
• 700 & Above Employee

• Postdoctoral Researcher

  • Sep 2017 - Feb 2022

  The definition of the metric system is one the greatest conceptual leap; comparable to the copernician revolution. This construction achieved an unprecedented level of elegance and simplicity with the recent definition of units based on quantum effects and fundamental constants. As a researcher in the Advanced Microwave Photonics group at NIST-Boulder, I had the chance to design a conceptually novel quantum current source, a step towards the long-term goal of realizing a current standard. While I benefited from the expertise of many specialists at NIST, I was vastly autonomous on that project. I investigated how novel superconducting elements - a Quantum Phase Slip Junction and high-impedance resonators - could be fabricated and used to invent innovative devices. This activity placed me at the forefront of the group's research effort and led me to spearhead the use of the Julia programming language, and of emerging tools in Quantum Engineering. On a fundamental level, I developed numerical simulations to prove that the envisioned design is viable. Hand-in-hand with experimental developments, I determined an optimal range of parameters and automated the layout-generation process. On a technical level, I troubleshooted and improved the group's fabrication process. I developed a new process that improved the reliability and performances of our devices and yielded results comparable to the field's state-of-the-art. A successful endeavor since this process has been adopted by several groups at NIST-Boulder. Building upon that knowledge, I initiated the characterization of high-impedance microwave resonators at sub-Kelvin temperatures, a keystone element for future quantum current sources. To achieve these results, I took a very systematic approach and automated sub-processes by writing custom drivers, code snippets and using Arduino microcontroller boards. I shared this work by writing internal documentation and training new users. Show less



Paris-Sud University (Paris XI)

• France
• Higher Education
• 500 - 600 Employee

• Postdoctoral Researcher

  • Feb 2017 - Jul 2017

  In a series of trailblazing works, the Mesoscopic Physics group lead by H. Bouchiat had recently showed that Bismuth nanowires belong to a novel class of materials - subsequently called Higher-Order Topological Insulators. At the same time, there had been an intense research activity to evidence a novel particle - called Majorana Fermion - in hybrid Superconducting/Topological Insulator systems, that held promises to realize a topologically protected Quantum Bit which would be immune to external perturbations and therefore superior to conventional Quantum Bits. Experimental evidence of Majorana fermions had been thus far controversial since they were susceptible to experimental artefacts. My project was to stay as close as possible to the initial Majorana fermion theoretical proposal by Fu and Kane, whereby the particle would be evidenced by measuring the fluctuations of the system, and to investigate topological signatures in hybrid Superconducting/Bismuth nanowire systems. I had perfected a unique technique during my Ph. D. to measure the dissipation at finite frequency of hybrid superconducting systems and relate it to its fluctuations. By applying this technique, I could evidence that Bismuth nanowire host topologically protected energy levels and estimate how spurious processes destroy this protection, an information relevant for potential applications. Show less



Leibniz Institute for Solid State and Materials Research

• Research
• 100 - 200 Employee

• Post-doctoral researcher - Alexander von Humboldt fellow

  • Mar 2014 - Feb 2016

  Even though the understanding of electronic properties of materials was thought to be a done deal, it has been realized in the 80s and afterwards that a whole piece was missing: some systems - called Topological Insulators and characterized by a single number called Topological Invariant - possess protected conducting states at their boundaries while staying insulating in their bulk. These systems display very intriguing transport properties and have potential applications in spintronics and disssipationless devices. I studied the Quantum transport properties of Bismuth-based topological insulators in the Mesospin Group at the IFW-Dresden. In particular, I fabricated nanostructures and measured their dc transport at low temperature and under intense magnetic field. While the measured data contained a strong contribution from the bulk of the system, I was able to extract the relevant information and evidence the unusually long transport length in topological insulators thanks to the spin-momentum locking of surface states Show less



Paris-Sud University (Paris XI)

• France
• Higher Education
• 500 - 600 Employee

• Ph. D. student

  • Oct 2010 - Dec 2013

  My Ph. D. research project can be summarized by this question: How can we evidence the dissipation mechanisms in an electronic system that is non-dissipative in its equilibrium state? To answer that question, I perfected a technique developed in the Mesoscopic Physics group in Orsay to measure the linear response of quantum devices at finite frequency. By embedding a non-superconducting gold wire into a superconducting resonator and measuring the resonator's resonance frequencies and quality factors, I could show that there are two main mechanisms participating to the emergence of dissipation in these systems: energy relaxation via inelastic processes so that electrons returns to a Fermi distribution and inter-level transitions. I successfully compared these experimental results to numerical simulations that also evidenced that "selection rules" between symmetric energy levels were at play in these systems. These results proved that such measurements provide much richer data than more conventional dc measurements and opened the path to probing more exotic systems such as graphene/superconductor or topological insulators/superconductor hybrids. Show less