Le Laboratoire Temps Espace
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The Laboratoire Temps Espace (LTE) was created on January 1, 2025. It is the result of the merger of two former Paris Observatory entities: SYRTE (SYstèmes de Référence Temps-Espace) and IMCCE (Institut de mécanique céleste et de calcul des éphémérides). LTE and is also associated with the CNRS (National Research Center), the Sorbonne Université and the LNE.
LTE is a leader in time and frequency metrology and is also specialized in Earth rotation, celestial reference frame and history of Astronomy. LTE has a multidisciplinary research activity with expertise in theory, instrumentation and data analysis and various goals from fundamental physics tests to industrial transfers. It is a founding member of Laboratoire d’Excellence du Programme Investissements d’Avenir FIRST-TF. The optical frequency metrology within LTE has developed some of the most precise strontium optical lattice clocks in the world. and in addition to the AQuRA project is developing a transportable ytterbium optical lattice clock. Within AQuRA, LTE will lead the development of the strontium optical lattice clock physics package as well as play a key role in both the system design and the integration and validation of the AQuRA clock. |
Team members
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Jérôme Lodewyck is a CNRS research at LTE, Observatoire de Paris. He has worked on Sr optical lattice clocks since 2007, with the objective of improving the stability and accuracy of these clocks. His activities encompasses the metrological applications of these clocks (contributions to the International Atomic Time, frequency ratio measurements, redefinition of the SI second, test of fundamental physics), as well as the use of quantum entanglement in lattice-trapped atoms.
Contact: [email protected] |
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Rodolphe Le Targat is staff researcher at LTE, Observatoire de Paris, since 2011. He leads frequency combs activities, together with the development of infrared ultrastable lasers at 1542 nm. He also coordinates the construction of a transportable optical lattice clock based on neutral ytterbium.
Contact: [email protected] |
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David Holleville is CNRS research engineering at LTE, Observatoire de Paris. He leads the Mechanical and UHV service at LTE, and has expertise in the design of optical systems and physics packages for optical clocks and other cold atom experiments.
Contact: [email protected] |
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Dr. Haosen Shang graduated from Peking Univerisity and then joined the strontium optical lattice clock team of LTE, Observatoire de Paris as a postdoc fellow. His works are on promoting the performance of the optical lattice clocks, including the improvement of the frequency stability via quantum nondemolition measurements and accurate estimations of some dominant systematic factors for reducing the frequency measurement uncertainty. As a part of the team, he also makes yearly contributions to the TAI with the strontium clocks in LTE.
Contact: [email protected] |
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Miguel Cifuentes is a PhD student at LTE, working on a next generation physics package for a stationary Sr optical lattice clock, focusing on reducing the uncertainty on the systematic effects associated with the black body radiation, cold collisions, and lattice light-shifts.
Contact: [email protected] |
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Pierre is a student from CentraleSupélec and from the Master QLMN of Université Paris-Saclay. He is doing his Master internship at LTE, Observatoire de Paris. He is part of the strontium optical clock team of Jérôme Lodewyck and will pursue as a PhD student after his internship.
Contact: [email protected] |
