Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

The SEMPARIS seminar webserver hosts annoucements of all seminars taking place in Paris area, in all topics of physics, mathematics and computer science. It allows registered users to receive a selection of announcements by email on a daily or weekly basis, and offers the possibility to archive PDF or Powerpoint files, making it available to the scientific community.   [ More information ]


Upcoming Seminars
[ scheduler view ]

Wednesday 19 June 2024, 11:00 at LKB, Room 2 – Collège de France – 11 Place Marcelin Berthelot – 75005 SEM-LKB (Séminaire du Laboratoire Kastler Brossel) quant-ph
Roman Schnabel ( Université Gottfried Wilhelm Leibniz de Hanovre ) Optical and Optomechanical Quantum Correlations in operational Gravitational Wave Detectors
Abstract: From 2010 to 2015, the gravitational-wave (GW) detector GEO600 was using squeezed light in all of its searches for GWs [1]. The successful sensitivity improvement triggered the implementation of “squeeze lasers” also in Advanced LIGO and Advanced Virgo. In 2019 they started their third observational run with an increased event rate of up to 50% due to the exploitation of squeezed states of light [2,3]. More recently, LIGO’s optical quantum noise was shown to be less than that at the Standard Quantum Limit (SQL) [4]. While a squeezed quantum uncertainty refers to quantum correlations in time, I will explain why the observation in [4] certifies correlations between the quantum uncertainties of the optical field and those of the motion of the 40 kg mirrors [5]. References : [1] LIGO Scientific Collaboration, Nature Physics 7, 962 (2011); [2] M. Tse et al., Phys. Rev. Lett. 123, 231107 (2019); [3] F. Acernese et al., Phys. Rev. Lett. 123, 231108 (2019); [4] H. Yu et al., Nature 583, 43 (2020); [5] R. Schnabel and M. Korobko, AVS Quantum Sci 4, 014701 (2022).

Wednesday 19 June 2024, 12:45 at LPENS, 3 rue dUlm FORUM-ENS (Forum de Physique Statistique @ ENS) cond-mat.stat-mech
Ananda Roy ( Rutgers University ) TBA
Abstract: TBA

Wednesday 19 June 2024, 14:00 at LPTHE, LPTHE library, tower 13-14, room 401 SEM-EXCEP (Seminaire exceptionnel) hep-th
Victor Godet ( SISSA ) Quantum cosmology as automorphic dynamics
Abstract: I will explain how some recent progress on the Wheeler-DeWitt equation makes possible the systematic development of quantum cosmology in the canonical formulation. The cosmological wavefunctions are automorphic forms, and the Wheeler-DeWitt equation reduces to a dynamical equation on moduli space, so that quantum cosmology is equivalent to "automorphic dynamics". I will describe in detail this equivalence in the simple context of pure three-dimensional gravity and comment on how these ideas should generalize to higher dimensions and to our universe.

Wednesday 19 June 2024, 14:15 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires) hep-th
Fridrik Gautason One-loop strings and holography
Abstract: I will discuss recent progress in computing one-loop partition functions of strings in type II backgrounds with RR flux. The backgrounds we focus on are relevant for holographic setups with well-understood gauge theory duals. The computation of certain observables in the QFT duals can be done using supersymmetric localization to a matrix model. Using string theory, we will compute the expectation value of BPS Wilson loop operators in gauge theories and determine non-perturbative corrections to sphere partition functions and compare with QFT predictions when available.

Thursday 20 June 2024, 10:00 at IHES, Amphithéâtre Léon Motchane PT-IHES (Séminaire de physique théorique de l'IHES) hep-th
Anton Kapustin ( Caltech et IHES ) Anomalies on a Lattice
Abstract: I will discuss two lattice avatars of ’t Hooft anomalies. The first one involves an action of a symmetry group on observables of a 1d spin system. It is related to a generalization of the Lieb-Schultz-Mattis theorem. The second one concerns symmetries of gapped states of spin systems. I will argue that the Hall conductance and other topological invariants of symmetric gapped states can be interpreted as obstructions to localizing the symmetry even approximately.

Thursday 20 June 2024, 11:00 at CDF, Amphitheatre Halbwachs
( https://indico.in2p3.fr/event/32058/overview )
WORK-CONF (Workshop or Conference) hep-th
Monteiro, Mertens, Trevisani LPENS Summer Institute
Abstract: First day of LPENS Summer Institute, taking place at College de France

Thursday 20 June 2024, 14:00 at LPTMC, LPTMC seminar room, Jussieu, towers 12-13, 5th floor, room 523
( [11] A.Jouan et al. Nature Elec. 3, 201–206 (2020). )
SEM-EXCEP (Seminaire exceptionnel) cond-mat
Nicolas Bergeal ( ESPCI Paris ) Superconducting oxides interfaces
Abstract: [For the full abstract see the attached pdf]. A key feature of these electronic systems lies in the possibility to control their carrier density by electric field effect, which results in gate-tunability of both superconductivity and Rashba spin-orbit coupling. In this talk, I will review complementary dc and microwave transport measurements conducted on SrTiO3 and KTaO3-based interfaces employing both back-gate and top-gate configurations. I will discuss, in particular, gate-induced multigap superconductivity [8,9] and the role of phase fluctuations within the Berezinskii-Kosterlitz-Thouless model [10]. I will also present the realization of field effect devices whose physical properties, including superconductivity and Rashba spin-orbit coupling, can be tuned over a wide range of electrostatic doping, and discuss the potential of oxides interfaces for the realization of mesoscopic devices [11].
Attachments:
  • Abstract_INSP_2024_Bergeal.pdf (72576 bytes) OPEN

Friday 21 June 2024, 10:00 at IPHT, Salle Claude Itzykson, Bât. 774 COURS (Cours) physics
Luca Santoni ( Université Paris Cité, CNRS, APC ) Aspects of black hole perturbation theory
Abstract: The direct detection of gravitational waves from merging binary systems notoriously marked an important milestone in physics. Much of the success of gravitational-wave astronomy relies on perturbation theory. Perturbative approaches are essential ingredients in the study of gravitational-wave sources in the strong-field regime, such as the ringdown after the merger of a binary system, tidally perturbed compact objects, and extreme mass ratio inspirals.\\ \\ \\ The course will review selected topics in the context of black hole perturbation theory. The lectures will provide a pedagogical introduction to the main concepts and ideas, dating back to the original works by Regge and Wheeler in the 1950s, while covering also some of the more recent developments and results in the literature.\\ \\ Aspects to be discussed include:\\ \\ -Introduction to black hole perturbation theory

Friday 21 June 2024, 10:00 at CDF, Amphitheatre Halbwachs
( https://indico.in2p3.fr/event/32058/overview )
WORK-CONF (Workshop or Conference) hep-th
Engelhardt, Hartnoll, Donnay LPENS Summer Institute
Abstract: Second day of LPENS Summer Institute, taking place at College de France

Saturday 22 June 2024, 11:00 at LPENS, Conf IV
( https://indico.in2p3.fr/event/32058/overview )
WORK-CONF (Workshop or Conference) hep-th
Dam Son ( Chicago ) LPENS Summer Institute
Abstract: Third day of LPENS Summer Institute, taking place at LPENS

Monday 24 June 2024, 11:00 at LPENS, Conf IV
( https://indico.in2p3.fr/event/32058/overview )
WORK-CONF (Workshop or Conference) hep-th
De Boer, Chapman LPENS Summer Institute
Abstract: Fourth day of LPENS Summer Institute, taking place at LPENS

Tuesday 25 June 2024, 11:00 at LPTMS, Salle des séminaires du FAST et du LPTMS LPTMS (Séminaire du Laboratoire de Physique Théorique et Modèles Statistiques (Orsay)) cond-mat.stat-mech
Anton Souslov ( University of Cambridge ) TBA

Tuesday 25 June 2024, 11:00 at LPENS, Conf IV
( https://indico.in2p3.fr/event/32058/overview )
WORK-CONF (Workshop or Conference) hep-th
S. Minwalla, H. Liu LPENS Summer Institute
Abstract: Fifth day of LPENS Summer Institute, taking place at LPENS

Tuesday 25 June 2024, 14:00 at IJCLAB, A018 NUC-THEO (Séminaire de physique nucléaire théorique) nucl-th
Daniel Phillips ( Ohio University ) Universal or not? EFT insights into reactions on two-neutron halos and $^6$Li
Abstract: Few-body universality connects the properties of systems that are governed by interactions which generate large s-wave scattering lengths, $a_0$. In the first part of this talk I will argue that several two-neutron halo nuclei could display aspects of few-body universality. In particular, I will show calculations of the two-neutron energy spectrum that is produced after rapid removal of the core from several exotic nuclei. After appropriate rescaling the resulting spectra are described by single curve, a result that is due to the proximity of the neutron-neutron and core-neutron interactions to the unitary limit $|a_0|\to \infty$. In the second part of the talk I will discuss ab initio results for $^6$Li that were obtained using the No-Core Shell Model with Continuum (NCSMC). The NCSMC calculations show a strong correlation between the deuteron separation energy in $^6$Li and the Asymptotic Normalization Coefficient of the alpha-deuteron component of its wave function. I will argue that this correlation is not a universal one, but that it is due to a factorization of long-distance and short-distance physics in $^6$Li, and that this factorization can be exploited to make ab initio calculations of that system more efficient.
Attachments:
  • Abstract.pdf (150927 bytes) OPEN

Wednesday 26 June 2024, 09:00 at LPENS, Amphitheatre Jean Jaurès, 29 rue d'Ulm, ENS
( https://indico.in2p3.fr/event/32058/overview )
WORK-CONF (Workshop or Conference) hep-th
M.gaberdiel,d.lust,h.ooguri,m.b.green,i.brunner,m.douglas,m.bianchi LPENS Summer Institute
Abstract: Sixth day of LPENS Summer Institute, Celebration of Costas Bachas

Wednesday 26 June 2024, 11:00 at LKB, Amphi Budé – Collège de France – 11 Place Marcelin Berthelot – 75005 SEM-LKB (Séminaire du Laboratoire Kastler Brossel) quant-ph
Kenji Ohmori ( Institute for Molecular Science (IMS), National Institutes of Natural Sciences ) Ultrafast quantum simulation and quantum computing with ultracold atom arrays at quantum speed limit
Abstract: Many-body correlations drive a variety of important quantum phenomena and quantum machines including superconductivity and magnetism in condensed matter as well as quantum computers. Understanding and controlling quantum many-body correlations is thus one of the central goals of modern science and technology. My research group has recently pioneered a novel pathway towards this goal with nearby ultracold atoms excited with an ultrashort laser pulse to a Rydberg state far beyond the Rydberg blockade regime [1-7]. We first applied our ultrafast coherent control with attosecond precision [2,3] to a random ensemble of those Rydberg atoms in an optical dipole trap, and successfully observed and controlled their strongly correlated electron dynamics on a sub-nanosecond timescale [1]. This new approach is now applied to arbitrary atom arrays assembled with optical lattices or optical tweezers that develop into a pathbreaking platform for quantum simulation and quantum computing on an ultrafast timescale [4-7]. In this ultrafast quantum computing, as schematically shown in Fig. 1, we have recently succeeded in executing a controlled-Z gate, a conditional two-qubit gate essential for quantum computing, in only 6.5 nanoseconds at quantum speed limit, where the gate speed is solely determined by the interaction strength between two qubits [5]. This is faster than any other two-qubit gates with cold-atom hardware by two orders of magnitude. It is also two orders of magnitude faster than the noise from the external environment and operating lasers, whose timescale is in general 1 microsecond or slower, and thus can be safely isolated from the noise. Moreover, this two-qubit gate is faster than the fast two-qubit gate demonstrated recently by “Google AI Quantum” with superconducting qubits [8]. References [1] N. Takei et al., Nature Commun. 7, 13449 (2016). Highlighted by Science 354, 1388 (2016); IOP PhyscisWorld.com (2016). [2] H. Katsuki et al., Acc. Chem. Res. 51, 1174 (2018). [3] C. Liu et al., Phys. Rev. Lett. 121, 173201 (2018). [4] M. Mizoguchi et al., Phys. Rev. Lett. 124, 253201 (2020). [5] Y. Chew et al., Nature Photonics 16, 724 (2022). (Front Cover Highlight) [6] V. Bharti et al., Phys. Rev. Lett. 131, 123201 (2023). [7] V. Bharti et al., arXiv:2311.15575 (2023). [8] B. Foxen et al., Phys. Rev. Lett. 125, 120504 (2020).

Wednesday 26 June 2024, 12:45 at LPENS, College de France 3 rue dUlm FORUM-ENS (Forum de Physique Statistique @ ENS) cond-mat.stat-mech
Leo Radzihovsky ( CU Boulder ) TBA
Abstract: TBA

Thursday 27 June 2024, 11:30 at LPENS, Conf IV
( https://indico.in2p3.fr/event/32058/overview )
WORK-CONF (Workshop or Conference) hep-th
T. Gherghetta, E. Hardy, M. Reece LPENS Summer Institute
Abstract: Seventh day of LPENS Summer Institute

Friday 28 June 2024, 10:00 at IPHT, Salle Claude Itzykson, Bât. 774 COURS (Cours) physics
Luca Santoni ( Université Paris Cité, CNRS, APC ) Aspects of black hole perturbation theory
Abstract: The direct detection of gravitational waves from merging binary systems notoriously marked an important milestone in physics. Much of the success of gravitational-wave astronomy relies on perturbation theory. Perturbative approaches are essential ingredients in the study of gravitational-wave sources in the strong-field regime, such as the ringdown after the merger of a binary system, tidally perturbed compact objects, and extreme mass ratio inspirals.\\ \\ \\ The course will review selected topics in the context of black hole perturbation theory. The lectures will provide a pedagogical introduction to the main concepts and ideas, dating back to the original works by Regge and Wheeler in the 1950s, while covering also some of the more recent developments and results in the literature.\\ \\ Aspects to be discussed include:\\ \\ -Introduction to black hole perturbation theory

Friday 28 June 2024, 11:00 at LPENS, Conf IV
( https://indico.in2p3.fr/event/32058/overview )
WORK-CONF (Workshop or Conference) hep-th
A. Madden, A. Thery LPENS Summer Institute
Abstract: Last day of LPENS Summer Institute

Friday 28 June 2024, 14:00 at LPTHE, Library LPTHE-PPH (Particle Physics at LPTHE) hep-ph
Bastian Jaime Diaz Saez ( Pontificia Universidad Católica de Chile ) Thermal dark photon dark matter and a long-lived axion mediator
Abstract: In this talk I am going to present about my recent work on the thermal freeze-out of a dark photon dark matter in the dark axion portal: a triple coupling among an axion-like particle, a dark photon, and the SM photon. We pay special attention to the coscattering regime (aka conversion-driven freeze-out). Furthermore, we explore a few prospects of having the axion as a long-lived particle, possibly to be searched at the LHC and future experiments.

Wednesday 3 July 2024, 11:00 at LKB, Amphi Budé – Collège de France – 11 Place Marcelin Berthelot – 75005 SEM-LKB (Séminaire du Laboratoire Kastler Brossel) quant-ph
Audrey Bienfait ( École normale supérieure de Lyon ) Implementing a quantum memory at microwave frequencies with Bismuth donors in silicon
Abstract: Among platforms for storing quantum states in the microwave domain, solid state spin ensembles addressed via superconducting circuits stand out for their multimodal storage capability and the second-long coherence time when operated at clock transitions [1]. Successful implementation of a practical memory scheme requires several keys features, such as the ability to tune on-demand the frequency and the bandwidth of the resonator [2]. In this talk, we will present a superconducting circuit architecture accomplishing both, allowing strong coupling to an ensemble of bismuth dopants in silicon. We devise a parametric process to dynamically control the virtual bandwidth of the superconducting circuit by exploiting its kinetic inductance nonlinearity, demonstrating coupling rate tuning range over a factor of 15. The strong coupling of the spins to the resonator also set radiation loss as the main nspin relaxation channel. Combined with nuclear and electronic drives, this Purcell effect enables to polarize the spins dynamically predominantly into a single ground state, allowing us to reach a cooperativity between the resonator and the spin ensemble near unity. [1] Wolfowicz, G. et al. Nature nanotechnology 8, 561–564 (2013). [2] Julsgaard, B. et al. Phys. Rev. Lett. 110, 250503 (2013).

Friday 5 July 2024, 10:00 at IPHT, Salle Claude Itzykson, Bât. 774 COURS (Cours) physics
Luca Santoni ( Université Paris Cité, CNRS, APC ) Aspects of black hole perturbation theory
Abstract: The direct detection of gravitational waves from merging binary systems notoriously marked an important milestone in physics. Much of the success of gravitational-wave astronomy relies on perturbation theory. Perturbative approaches are essential ingredients in the study of gravitational-wave sources in the strong-field regime, such as the ringdown after the merger of a binary system, tidally perturbed compact objects, and extreme mass ratio inspirals.\\ \\ \\ The course will review selected topics in the context of black hole perturbation theory. The lectures will provide a pedagogical introduction to the main concepts and ideas, dating back to the original works by Regge and Wheeler in the 1950s, while covering also some of the more recent developments and results in the literature.\\ \\ Aspects to be discussed include:\\ \\ -Introduction to black hole perturbation theory

Friday 12 July 2024, 10:00 at IPHT, Salle Claude Itzykson, Bât. 774 COURS (Cours) physics
Luca Santoni ( Université Paris Cité, CNRS, APC ) Aspects of black hole perturbation theory
Abstract: The direct detection of gravitational waves from merging binary systems notoriously marked an important milestone in physics. Much of the success of gravitational-wave astronomy relies on perturbation theory. Perturbative approaches are essential ingredients in the study of gravitational-wave sources in the strong-field regime, such as the ringdown after the merger of a binary system, tidally perturbed compact objects, and extreme mass ratio inspirals.\\ \\ \\ The course will review selected topics in the context of black hole perturbation theory. The lectures will provide a pedagogical introduction to the main concepts and ideas, dating back to the original works by Regge and Wheeler in the 1950s, while covering also some of the more recent developments and results in the literature.\\ \\ Aspects to be discussed include:\\ \\ -Introduction to black hole perturbation theory

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