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Région Ile de France
26/08/2025

News > Job > Offre de post-doc
Metrological characterization of traveling wave parametric amplifiers (TWPA)

Laboratory : LNE
Place : Trappes - Bassin de St Quentin-en-Yvelines
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Duration : 24 months

LNE

A leader in the field of measurement and standards, with a strong reputation in France and internationally, the LNE supports industrial innovation and is positioned as a key player in promoting a more competitive economy and a safer society. At the crossroads of science and industry since its creation in 1901, the LNE offers its expertise to all economic players involved in product quality and safety. As the leader in French metrology, our research is at the heart of our public service mission and is a fundamental factor in supporting the competitiveness of businesses. We are committed to meeting the requirements of industry and academia for ever more accurate measurements, carried out in increasingly extreme conditions or on innovative subjects such as autonomous vehicles, nanotechnologies, and additive manufacturing.

Missions

As part of the National Quantum Strategy, the LNE coordinates the MetriQs-France program, dedicated to the development, operation, and promotion of measurement standards for the reliable characterization and evaluation of quantum technologies. Among the enabling technologies for qubits, traveling wave parametric amplifiers (TWPA), based on the Josephson effect, are key components for the optimal reading of superconducting qubits, which require high-fidelity electrical measurements via amplification with noise close to the quantum limit over a wide bandwidth. The reliable and harmonized evaluation and quantification of the performance of these Josephson parametric amplifiers is crucial to improving the maturity of this technology and, ultimately, to progressing toward the overall evaluation of the performance of superconducting quantum computers, a major objective of the MetriQs program. Within the LNE’s fundamental electrical metrology department, your mission will be to coordinate the LNE’s work on the metrological characterization of TWPA in various projects, both at the national level (MetriQs-Dev-France MOCQUA) and European level (Horizon Europe JRP MetSuperQ and Qu-Test projects). You will contribute fully to the experimental work planned as part of these various projects and to their promotion.

In this context, your main tasks will therefore consist of:

  • Participating in standardization efforts concerning TWPA (intercomparisons, best practice guides, etc.).
  • Developing high-frequency measurement techniques (calibrated S parameters, noise, etc.) at cryogenic temperatures and applying them to the characterization of TWPA, both as isolated components and as components integrated into a superconducting qubit readout chain;
  • Analyzing the data obtained and comparing it with theoretical and simulated models;
  • Promoting the results through scientific communications (articles and conferences);

Profil

You hold a PhD in solid-state quantum physics.
You are able to analyze results and synthesize information.
You are pragmatic, rigorous, and possess a critical mind. You are able to work both independently and as part of a team. You are open to participating in several projects at different levels (at LNE, nationally, and in Europe).
You have experience in cryogenic measurements of superconducting circuits, including microwave measurements and associated engineering, and ideally previous experience in characterizing Josephson parametric amplifiers.
You have a strong interest in experimental science, measurement, instrumentation, and technological and applied research.
Fluency in scientific English is required.

Rejoindre le LNE

  • Join an international group of nearly 1,000 employees.
  • Participate in the development of an EPIC that has been serving society and citizens since 1901.
  • Join an organization that supports local authorities and manufacturers in meeting the societal and environmental challenges of tomorrow.
  • Join a research organization involved in European and international projects.
  • Join a company that places respect and fairness at the heart of its HR policies.
  • Join a company that is committed to CSR and has implemented a sustainable mobility package agreement.
  • Join a company that offers personalized integration and regular training courses.
  • Enjoy a fixed salary over 12 months as well as an annual end-of-year bonus.
  • Enjoy executive status with numerous benefits.
  • Enjoy a profit-sharing bonus and an employee savings plan (PEE/PERCO) with employer contributions.
  • Enjoy health insurance* and life insurance*.
  • Have access to the company restaurant directly on our Trappes site.
  • Have access to a wide range of offers through our CSE

*under the conditions set out in the agreements and their amendments.

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09/07/2025

News > Job > Offre de thèse
PhD position – Soliton gas within 1D quantum gases

Laboratory : LPL - Laboratoire de Physique des Lasers
Place : Université Sorbonne Paris Nord
Wage : 2200€
Manager : aurelien.perrin@univ-paris13.fr
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Duration: 36 months

Starting date: October, 6

The Bose-Einstein condensate group of the Laboratoire de Physique des Lasers (CNRS/Université Sorbonne Paris Nord) is an expert in the out of equilibrium physics of quantum gases. We offer a PhD position to work on the sodium project, where we produce degenerate quantum gases on top of an
atom chip. The extremely elongated trap geometry offered by the chip design allows to reach the unidimensional regime.


The aim of the PhD project is to demonstrate the presence of solitons in one-dimensional weakly interacting Bose gases at finite temperature or following dynamic excitation. The gas can be described by a wave function, or equivalently by a density and a phase. A soliton corresponds to a local density depletion that propagates within the gas without dispersion. The presence of solitons in the system can be revealed by direct imaging or by the shape of the gas velocity distribution. The objective of this thesis project is to study the out-of-equilibrium dynamics of a weakly interacting Bose gas confined in a box trap under strong excitation, and to evidence the presence of solitons in the gas. While the project is mainly experimental, it may also include numerical simulations of these phenomena.

Environment

  • University Sorbonne Paris Nord campus is located less than 30 minutes from the center of Paris.
  • The team currently comprises a PhD, a postdoc and three researchers.
  • The laboratory hosts four other ultra-cold atom experiments and various physics projects including
    fundamental ones and applications. Electronic, mechanical and optical workshops support our
    activities.
15/05/2025

News > Job > Offre de post-doc
Postdoctoral position in quantum gases

Laboratory : LPL - Laboratoire de Physique des Lasers
Place : Université Sorbonne Paris Nord
Manager : Laurent Vernac : laurent.vernac@univ-paris13.fr
Postuler

Duration: 15 months (ANR funding)
Starting date: September 1st, 2025

The Magnetic Quantum Gases (GQM) group of LPL offers a postdoctoral position in the field
of dipolar quantum gas experiment using chromium atoms. Magnetic atoms, which can be
loaded in optical lattices in a low-entropy state, provide a highly relevant platform for the study
of quantum magnetism. The host team studies out-of-equilibrium dynamics of long-range
interacting spin systems, and in particular seeks to measure the development of entanglement
linked to the phenomenon of quantum thermalization. The person recruited will first contribute to the assembly of the new UHV experiment chamber, and to the installation of the new laser cooling and trapping system. He/she will play a leading role in obtaining a BEC, then in loading it into an optical lattice, and will set up the new tools the team has planned in order to obtain new results on the physics of interacting N-body systems: adaptive optics, in order to explore new trapping geometries; in-vacuum RF coils to better control RF transitions; measurement of the magnetic field close to the atoms by
spectroscopy.


Two teacher-researchers, a CNRS researcher, and a CNRS research engineer are involved in
the project. We have established fruitful collaborations with theorists for the interpretation of
our results.

Profile and skills required:

The candidate must have a solid experience in cold atoms experiment, in particular in optics
and light-matter interactions

Recent results of the team:

Probing Coherences and Itinerant Magnetism in a Dipolar Lattice Gas, Thomas Lauprêtre et al,
arXiv:2501.11402 (2025)
Measuring bipartite spin correlations of lattice-trapped dipolar atoms, Youssef Aziz Alaoui et
al, Phys. Rev. Lett. 133, 203401 (2024)

26/02/2025

News > Job > Offre d'emploi permanent
Research engineer – Cold Atom Inertial Sensors

Laboratory : ONERA
Place : Palaiseau
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A permanent research engineer position is available in ONERA’s DPHY/SLM unit. This position is linked to the development of cold atom-based inertial sensors.

Missions:

The Laser Sources and Metrology (SLM) team at DPHY is in charge of developing optical and atomic metrology techniques, as well as implementing them in validation instrumental prototypes. To this end, studies are carried out at different levels of maturity: from exploratory instrumental research in the laboratory, to carrying instruments on different carriers (aircraft or other), carrying out measurement campaigns and processing the associated data.

The position is dedicated to DPHY/SLM activities linked to the development of inertial sensors.
These instruments are based on the joint use of commercial sensors and sensors specifically developed by the unit’s engineers and technicians, using atom interferometry technology (quantum technology based on the interaction of light with atoms, mastered by the team for some fifteen years). These instruments are used in measurement campaigns.

In this context, your missions will be as follows:

  • You will manage ongoing projects and participate in setting up new study proposals. You will be required to be technically involved in the processing and analysis of data from all instruments during measurement campaigns (co-processing of data from the cold atom sensor and data from other sensors).
  • You will also participate in the integration of the instruments into the carriers and their implementation during regular airborne measurement campaigns (2 – 3 weeks/year). You will be involved in the design and production phases (particularly in terms of computer control, co-integration with inertial sensors or other commercial sensors), and in the testing of inertial systems.
  • You will contribute to the valorization of all this work by developing interactions with the academic and university community, as well as with industrial players.
  • You will be committed to scientific outreach through publications and participation in conferences on the subject.

Finally, you will be involved in the development of the SLM team’s activities, taking part in the supervision of internships and theses, as well as setting up and carrying out various projects.

Profil:

Engineer or PhD with strong skills in data processing and instrument control (Python, Labview, Matlab).

Initial experience in inertial measurement and GNSS technology would be a plus.

You have the ability to work in a multi-disciplinary team on a unifying project.

You have a strong appetite for project management (organization, follow-up, drafting of reports and technical proposals, interaction with customers and principals).

You have a strong taste for putting innovative and fundamental concepts into practice for application purposes, notably through participation in airborne measurement campaigns.

You have good writing skills in French and English (specifications, technical reports).

09/12/2024

News > Job > Offre de post-doc
Postdoctoral position in quantum inertial sensing with cold atoms

Laboratory : ONERA / LCM LNE-Cnam
Manager : Malo CADORET and Yannick BIDEL
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Our research group focusses on harnessing the wave-like properties of cold atoms to realize quantum inertial sensors based on cold atom interferometry for real-word applications such as gravity mapping or navigation.


Our team is at the international forefront in developing cold atom gravimeters for onboard applications [1-3]. Currently, we are working on the development of a compact and complete hybridized cold atom
inertial measurement unit (IMU). Our goal is to have a single atomic sensor that will alternately measure each inertial component (3 accelerations and 3 rotations), instead of having six independent atomic sensors each measuring one inertial component. Every atomic measurement will be hybridized with its corresponding classical sensor in order to benefit from the advantages of both technologies.
To date, our experimental setup can measure the vertical and the horizontal accelerations with hybridized cold-atom interferometric sensors [4-5]. We are looking for an experienced researcher to aid the ongoing development of the compact cold atom gyroscope [6] of the IMU. The postdoc project aims to push further the development the metrological characterization of the cold atom gyroscope in terms of sensitivity, long-term stability and accuracy. Additionally, the technique of Bloch oscillations will be implemented on the setup to increase the performance of the cold atom gyroscope.

Responsabilities:

  • Development of the cold atom gyroscope using Bloch oscillations.
  • Develop simulations to predict the performance of the sensor.
  • Work with Ph.D. students and other members of the group.
  • Actively participate in the publication of research results in high-quality scientific journals and their
    presentation at national and international conferences

Qualifications:

  • Ph.D. in physics
  • Strong background in cold atom interferometry.
  • Experience with cold atom experiments.
  • Experience with simulation software.
  • Ability to work effectively in a team.

[1] Y. Bidel, N. Zahzam, C. Blanchard, A. Bonnin, M. Cadoret, A. Bresson, D. Rouxel, and M-.F. Lalancette. « Absolute marine gravimetry with matter-wave interferometry ». Nature Communications, 9, 02 2018
[2] Y. Bidel, N. Zahzam, A. Bresson, C. Blanchard, M. Cadoret, A. V. Olesen, and R. Forsberg. « Absolute Airborne Gravimetry with a Cold Atom Sensor ». Journal of Geodesy, 94, 02 2020.
[3] Y. Bidel, N. Zahzam, A. Bresson, C. Blanchard, A. Bonnin, J. Bernard, M. Cadoret, et al. « Airborne Absolute Gravimetry With a Quantum Sensor, Comparison With Classical Technologies ». Journal of Geophysical Research : Solid Earth, 128, 4, 04 2023.
[4] I. Perrin, J. Bernard,Y. Bidel, A. Bonnin, N. Zahzam, C. Blanchard, A. Bresson, and M. Cadoret. Zero-velocity atom interferometry using a retroreflected frequency-chirped laser. Phys. Rev. A 100, 053618, 2019.
[5] J. Bernard, Y. Bidel, M. Cadoret, C. Salducci, N. Zahzam, S. Schwartz, A. Bonnin, C. Blanchard and A. Bresson ”Atom interferometry using σ+ − σ− Raman transitions between |F = 1,mF = ∓1⟩ and |F =2,mF =±1⟩” Physical Review A, vol. 105, p. 033318, 2022
[6] Clément Salducci, Yannick Bidel, Malo Cadoret, Sarah Darmon, Nassim Zahzam, Alexis Bonnin, Sylvain Schwartz, Cédric Blanchard and Alexandre Bresson « Stabilizing classical accelerometers and gyroscopes with a quantum inertial sensor» arXiv:2405.13689 2024.

The position is available starting from the beginning of 2025, and the initial appointment is for one
year, renewable. The salary is based on French regulations.


Interested candidates may contact Malo CADORET (malo.cadoret@lecnam.net) or Yannick
BIDEL (yannick.bidel@onera.fr) as soon as possible. The application should contain a CV, a list of
publications, a short research statement (cover letter), and contact information for two senior
researchers who can provide recommendation letters.