Upcoming seminars
Select a date:
Seminar type:
Period:
WED. 14 OCT. - 14h00
2026
Scaling regimes of the 1D Kuramoto-Sivashinsky equation
Oct 14, 2026 - 14h00 Seminar | externe | 
🧑🏫 Liuba Gosteva
🎓 LPMMC
🎓 LPMMC
📍 Location : Salle Roger Maynard G-421
📧 Contact : Pierre Nataf
The Kuramoto-Sivashinsky (KS) equation describes various phenomena exhibiting chaos and instabilities, including flames, reaction-diffusion processes, and thin liquid film flows. It resembles the Kardar-Parisi-Zhang (KPZ) equation, with the key difference being the negative "viscosity" in the KS equation. The KS equation is known to belong to the KPZ universality class: at large scales, its statistical properties are governed by the KPZ fixed point, characterized by the dynamical exponent $z=3/2$ and a known PDF of fluctuations. In this talk, I will analyze the stochastic KS equation using the functional renormalization group (FRG). In this framework, attractive fixed points of the FRG equation determine large-scale universal behavior, while unstable fixed points govern small-scale universal behavior. I will show that the two-point correlation function exhibits, besides the KPZ scaling at large scale, another universal scaling regime at small scale, with $z=1$. This scaling is very robust as it is intrinsic to the KS dynamics. It arises from the vanishing of the effective viscosity when evolving from its microscopic negative KS value, to its macroscopic effective positive KPZ value. I will also present results from direct numerical simulations, which confirm these findings.
The talk is based on the following articles:
[1] L. Gosteva, D. Roy, N. Wschebor, and L. Canet, arXiv:2605.23364 (2026).
[2] L. Gosteva, N. Wschebor, and L. Canet, arXiv:2607.15784 (2026).
The talk is based on the following articles:
[1] L. Gosteva, D. Roy, N. Wschebor, and L. Canet, arXiv:2605.23364 (2026).
[2] L. Gosteva, N. Wschebor, and L. Canet, arXiv:2607.15784 (2026).
TUE. 20 OCT. - 14h00
2026
Coherent interaction between individual electron spins and superconducting circuits and dispersive spin detection
Oct 20, 2026 - 14h00 Seminar | nanoEQ |
🧑🏫 James O'SULLIVAN
🎓 CEA Saclay, Quantronics group
🎓 CEA Saclay, Quantronics group
📍 Location : Salle Rémy Lemaire K223, Institut Néel
📧 Contact : Loïc Herviou
Spin defects in solids can be engineered as well-isolated two-level-systems with coherence that can exceed seconds, but couple weakly to other quantum systems and to electromagnetic fields. In the lab, exploring quantum optical effects in the microwave regime with spin defects requires an enhancement of the light-matter interaction; this may be achieved by coupling the spin to a low-impedance superconducting resonator. I will present two recent results involving resonator design and exploration of magnetic noise-insensitive spin defects. The first is a demonstration of the dispersive shift in frequency of a superconducting resonator conditioned on the state of a single electron spin. The second is a coherent interaction between a single magnetic-noise-insensitive electron spin transition and the field of a resonator in the so-called high cooperativity regime.
WED. 21 OCT. - 11h00
2026
Cavity-controlled superconductivity: interplay of matter and photonic fluctuations
Oct 21, 2026 - 11h00 Seminar | externe |
🧑🏫 Vadim Plastovets
🎓 University of Augsburg
🎓 University of Augsburg
📍 Location : Salle Roger Maynard G-421
📧 Contact : Pierre Nataf
Confining electromagnetic fields in a cavity reshapes the photonic environment of a superconductor, providing a tunable control of its superfluid stiffness. We show that the sign of this effect depends qualitatively on the underlying superconducting regime. In conventional low-temperature BCS superconductors, cavity-photon-mediated electron-electron interactions renormalize the kinetic mass of Cooper pairs, leading to a reduction of effective superfluid density near critical temperature. In contrast, in phase-fluctuating two-dimensional superconductors (such as underdoped cuprates), the cavity reshapes the collective plasma mode and can thereby suppress thermally excited phase fluctuations, effectively enhancing the superfluid stiffness. These theoretical findings provide a possible explanation for recent experimental observations in niobium- and cuprate-based systems.
TUE. 03 NOV. - 14h00
2026
tba
Nov 3, 2026 - 14h00 Seminar | quantalps |
🧑🏫 Giovanna Morigi
📍 Location : Salla de conférences du CNRS - Bât. A
📧 Contact : Michele Filippone
WED. 04 NOV. - 11h00
2026
SEMINAR : externe
Nov 4, 2026 - 11h00 Seminar | externe |
🧑🏫 Michael Sonner
🎓 UC Berkeley
🎓 UC Berkeley
📍 Location : Salle Roger Maynard G-421
📧 Contact : Loic Herviou
TUE. 10 NOV. - 14h00
2026
Quantum simulation with Fluxonium Qutrit Arrays
Nov 10, 2026 - 14h00 Seminar | nanoEQ |
🧑🏫 Ivan Amelio
🎓 Unversity of Ghent
🎓 Unversity of Ghent
📍 Location : Salle Rémy Lemaire K223, Institut Néel
📧 Contact : Loïc Herviou
Fluxonium superconducting circuits were originally proposed to realize highly coherent qubits. In this talk, we explain how these circuits can be used to implement and harness qutrits, by tuning their energy levels and matrix elements via an external flux bias. In particular, we investigate arrays of fluxonium qutrits, and their potential for the quantum simulation of exotic quantum matter. We identify different operational regimes, classified according to the plasmon-like versus fluxon-like nature of the qutrit excitations. Highly tunable on-site interactions are complemented by correlated single-particle hopping, pair hopping and non-local interactions, which naturally emerge and have different weights in the different regimes. We investigate the rich ground-state phase diagram of qutrit arrays and propose practical dynamical experiments to probe the different regimes. Future directions towards analogue simulation of exotic quantum matter are presented.
TUE. 17 NOV. - 14h00
2026
Qubit measurements using nonreciprocal amplifiers
Nov 17, 2026 - 14h00 Seminar | nanoEQ |
🧑🏫 Florent Lecocq
🎓 NIST (Boulder)
🎓 NIST (Boulder)
📍 Location : Salle Rémy Lemaire K223, Institut Néel
📧 Contact : Loïc Herviou
High-fidelity QND qubit measurements are a cornerstone of quantum error correction schemes. In state-of-the-art superconducting quantum processors, this is achieved by combining dispersive readout with low-noise microwave measurement chains based on parametric amplifiers. However, to protect the qubits from unwanted backaction, typical systems require multiple stages of bulky magnetic circulators, a major roadblock toward scaling this approach to thousands or millions of qubits. Here I will discuss various efforts toward building amplifiers which embed directionality, and their applications to qubit measurements. In particular, I will focus on the experimental demonstration of high-fidelity, multiplexed, QND qubit measurements with a circulator-free readout chain, achieving all the requirements for scalability.
WED. 18 NOV. - 11h00
2026
SEMINAR : externe
Nov 18, 2026 - 11h00 Seminar | externe |
🧑🏫 Florian Simon
🎓 Technical University Munich
🎓 Technical University Munich
📍 Location : Salle Roger Maynard G-421
📧 Contact : Cécile Repellin
FRI. 20 NOV. - 11h00
2026
SEMINAR : theorie
Nov 20, 2026 - 11h00 Seminar | theorie |
🧑🏫 Fan Yang
📍 Location : Salle Roger Maynard G-421
📧 Contact : Loic Herviou
WED. 25 NOV. - 11h00
2026
SEMINAR : externe
Nov 25, 2026 - 11h00 Seminar | externe |
🧑🏫 Baptiste Bermond
🎓 Laboratoire Kastler-Brossel
🎓 Laboratoire Kastler-Brossel
📍 Location : Salle Roger Maynard G-421
📧 Contact : Cécile Repellin
FRI. 27 NOV. - 11h00
2026
SEMINAR : theorie
Nov 27, 2026 - 11h00 Seminar | theorie |
🧑🏫 Alexander Wietek
🎓 Max Planck Institute for the Physics of Complex Systems
🎓 Max Planck Institute for the Physics of Complex Systems
📍 Location : Salle Roger Maynard G-421
📧 Contact : Serge Florens
WED. 02 DEC. - 11h00
2026
SEMINAR : reserve
Dec 2, 2026 - 11h00 Seminar | reserve |
🧑🏫 Naïmo Davier
📧 Contact : pierre.nataf@lpmmc.cnrs.fr
TUE. 08 DEC. - 14h00
2026
tba
Dec 8, 2026 - 14h00 Seminar | quantalps |
🧑🏫 Christian Rüegg
🎓 Paul Scherrer Institute PSI
🎓 Paul Scherrer Institute PSI
📧 Contact : Michele Filippone
FRI. 18 DEC. - 11h00
2026
SEMINAR : theorie
Dec 18, 2026 - 11h00 Seminar | theorie |
🧑🏫 Peru d'Ornellas (To be confirmed)
📍 Location : Salle Roger Maynard G-421
📧 Contact : Serge Florens
FRI. 08 JAN. - 11h00
2027
SEMINAR : theorie
Jan 8, 2027 - 11h00 Seminar | theorie |
🧑🏫 Federico Becca
🎓 University of Trieste
🎓 University of Trieste
📍 Location : Salle Roger Maynard G-421
📧 Contact : pierre.nataf@lpmmc.cnrs.fr
FRI. 22 JAN. - 11h00
2027
tba
Jan 22, 2027 - 11h00 Seminar | quantalps |
🧑🏫 Jacqueline Bloch
📧 Contact : Michele Filippone