In this seminar, I will begin by discussing the mechanisms of ageing, with a particular focus on telomeres. Specifically, I will examine how different environmental conditions during pre-and post-natal development affect telomere length and dynamics in the yellow-legged gull, Larus michahellis. I will present results from our recent studies investigating the role of maternal glucocorticoids, exposure to prenatal social stressors (e.g. predation risk) and microbiome development in influencing postnatal telomere dynamics and telomere repair mechanisms. For example, our results suggest that mothers can increase telomere length in their offspring by moderately increasing the amount of glucocorticoids (i.e. corticosterone) in their eggs. However, complementary evidence suggests that endogenous glucocorticoid production in response to stressors, such as predation risk, comes at the cost of loss of telomere length. I will also show how the development of the gut microbiome early in life is related to telomere length in the early postnatal period. In the second part of the seminar, I will focus on a different animal model, the Mediterranean field cricket, Gryllus bimaculatus. I will use this invertebrate species to illustrate the links between sex, plasticity and ageing. I will highlight several examples of how the adult sociosexual environment can induce plasticity in the allocation strategies between traits under pre- and post-copulatory sexual selection, and the implications of such changes for lifespan and ageing rates.Topic: Zoom meeting – DEPE animation scientifique – BEEPS Join Zoom Meetinghttps://cnrs.zoom.us/j/92785456777?pwd=NU1FQzdwVTFERXZqMG5LRXJRSUlQZz09 Meeting ID: 927 8545 6777Passcode: LT1fEU
https://indico.in2p3.fr/event/31788/
Début : 25/01/2024 à 11:00
Fin : 25/01/2024 à 12:00
Prochains évènements
Retour à l'agenda3rd Joint IceCube-KM3NeT-JUNO NMO Workshop
https://indico.in2p3.fr/event/40032/
Probing Photon Indistinguishability with Fast Spectrometers
Speakers: Andrei Nomerotski (Czech Technical University in Prague) Quantum technologies critically rely on the ability to detect and identify indistinguishable photons, as only such photons exhibit high-contrast quantum interference. We present a new approach to real-time photon indistinguishability detection based on ultrafast spectro-temporal imaging using pixelated detectors. The concept maps each detected photon onto a well-defined time–frequency (t,ω) mode corresponding to an individual pixel, which effectively acts as a selector of the quantum state, enabling direct identification of interfering photon pairs as well as higher-order correlations. The implemented system combines an optical spectrometer with a fast pixelated readout based on a SPAD linear array (LinoSPAD2), achieving ~40 ps timing and ~40 pm spectral resolution. We report the first demonstration of massively parallel, wavelength-resolved photon bunching in two-photon Hanbury Brown–Twiss interference measurements for broadband light, simultaneously across ~100 independent spectral channels - an improvement of more than an order of magnitude over previous results [1]. This performance approaches the Heisenberg–Gabor limit for joint time–frequency measurements, a regime not accessible with existing detector technologies. We further present ongoing efforts to enhance spectral resolution using an echelle spectrometer architecture, targeting the regime where each pixel corresponds to a single spectro-temporal mode, as well as discussing prospects for extending the concept to fast two-dimensional detector arrays at Heisenberg–Gabor limit, targeting timing resolutions of ~20 ps and spectral resolutions of ~5 pm. A key feature of this approach is the ability to perform indistinguishability analysis and extend it toward real-time processing, drastically reducing data volumes by selecting only relevant photon events. Importantly, the method naturally generalizes beyond two-photon interference to genuine multiphoton correlation measurements, including photon-number-resolved events within single pixels. This technology opens new opportunities across multiple domains, including wavelength-multiplexed quantum communication, long-baseline astronomical interferometry, and quantum imaging and sensing with enhanced background rejection in photon-starved conditions. [1] Hanbury Brown-Twiss interference with massively parallel spectral multiplexing for broadband light, S Kulkov et al, preprint arXiv:2509.05649 (2025). https://indico.in2p3.fr/event/40519/