SERRANO D., KLEIN T., MARCENAT C., GOLDNER P., HARTMAN M., FANG B., LE COQ Y. and SEIDELIN S., “From heat capacity to coherence in ultranarrow-linewidth solid-state optical emitters at subkelvin temperatures”, Applied Physics Letters, 2026, 25, 4, DOI: 10.1103/vj7j-jp9y.

LANDRAGIN A., MARLIERE N. and DUVERGER R., “High sensitivity and accuracy with a large area cold atom gyroscope”, Physics of Quantum Electronics, Snow Bird, Utah, USA, France, 5-9 Jan. 2026, https://hal.science/hal-05504579.

ABDALLA A., ABE M., ABEND S. et al., “Terrestrial very-long-baseline atom interferometry: summary of the second Workshop”, European Physical Journal Quantum Technology, 2025, 12, 1, 42, Workshop held on April 2024, DOI: 10.1140/epjqt/s40507-025-00344-3, HAL-05022594.

AKULSHIN A.M., BUDKER D., PEDREROS BUSTOS F., DANG, T. KLINGER E., ROCHESTER S.M., WICKENBROCK A. and ZHANG R., “Remote detection optical magnetometry”, Physics Reports, 2025, 1106, 1-32, DOI: 10.1016/j.physrep.2024.11.004.

BALLAND Y. and PEREIRA DOS SANTOS F., “Measuring short range stray electric fields with a force quantum sensor”, Comptes Rendus. Physique, Académie des Sciences/Institut de France, 2025, 26, 631-640, DOI: 10.5802/crphys.264, HAL-05367143.

BREUREC J., ABDEL HAFIZ M., CALOSSO C., LELIÈVRE O. and BOUDOT R., “Frequency shifts in a coherent population trapping Cs vapor cell atomic clock”, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2025, 72, 8, 1160-1171, DOI: 10.1109/TUFFC.2025.3575002.

CALLEJO M., MURSA A., VICARINI R., KLINGER E., TANGUY Q., MILLO J., PASSILLY N. and BOUDOT R., “Short-term stability of a microcell optical reference based on the Rb atom two-photon transition at 778 nm”, Journal of the Optical Society of America B, 2025, 42, 1, 151-159, DOI: 10.1364/JOSAB.533904.

COLLOMBON M., CANTIN E., HAGEL G., POTTIE P.-E., HOUSSIN M. and CHAMPENOIS C., “Performance and uses of the REFIMEVE metrological signal, 1000 km from the source”, Journal of the Optical Society of America B, 2025, 42, 11, 2429-2435, DOI: 10.1364/JOSAB.569744, HAL-05096916v1.

CORGIER R., MALITESTA M., SIDORENKOV L.A., PEREIRA DOS SANTOS F., ROSI G. et al., “Optimized squeezing for accurate differential sensing under large phase noise”, Quantum Science and Technology, 2025, 10, 4, 045016, DOI: 10.1088/2058-9565/adf2d8, HAL-05363835.

DALMAZZONE C., GUIGUE M., MELLET, L., POPOV B., RUSSO S., VOISIN V., ABGRALL M., CHUPIN B., LIM C., POTTIE P.-E. and ULRICH P., “Precise synchronization of a free-running Rubidium atomic clock with GPS Time for applications in experimental particale physics”, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2025, 1075, 170358, DOI: 10.1016/j.nima.2025.170358, HAL-04669332.

GARCION C., GILL S.S., MISSLISCH M., HEIDT A., PAPADAKIS I. et al., “Dark energy search by atom interferometry in the Einstein-elevator”, EPJ Quant.Technol., 2025, 12, 1, 65, DOI: 10.1140/epjqt/s40507-025-00371-0, HAL-04989349.

GAVILAN-MARTIN D., LUKASIEWICZ G., PADNIUK M., KLINGER E., SMOLIS M., FIGUEROA N.L., JACKSON KIMBALL D.F., SUSHKOV A.O., PUSTELNY S., BUDKER D. and WICKENBROCK A., “Searching for dark matter with a spin-based interferometer”, Nature Communications, 2025, 16, 4953, DOI: 10.1038/s41467-025-60178-6.

GUESSOUM M., MARLIÈRE N., CHERFAN C., GEIGER R. and LANDRAGIN A., “Real-time phase control methods for cold-atom interferometry”, Physical Review Applied, 2025, 25, 2, 024058, DOI: 10.1103/4fts-8fp8, HAL-05422087.

HARTMAN M.T., WAGNER N., SEIDELIN S. and FANG B., “Thermal-noise limits to the frequency stability of burned spectral holes”, Applied Physics Letters, 2025, 127, 022203, DOI: 10.1063/5.0258936, HAL-04823394.

HAUDEN M., MILLO J., MATUSKO M., PONCIANO OJEDA F.S., KERSALÉ Y. and DELEHAYE M., “Offset sideband locking to iodine for laser cooling on the 1S₀ → 3P₁ transition of ¹⁷¹Yb”, Optics Express, 2025, 33, 6, 12519, DOI: 10.1364/OE.547123.

HOSSEINI ARANI A., SCHILLING M., TENNSTEDT B., KUPRIYANOV A., BEAUFILS Q., KNABE A., SREEKANTAIAH A.C., PEREIRA DOS SANTOS F., SCHÖN S. and MÜLLER J., “Combined classical and quantum accelerometers for future satellite gravity missions”, Earth and Space Science, 2025, 12, 4, DOI: 10.1029/2024ea004187, HAL-05363853.

KACZMARCZUK B., GOMES BAPTISTA, J., MERLET S., SIDORENKOV L.A., BEAUFILS Q. and PEIRERA DOS SANTOS F., “Statistical analysis of the rotation induced decay of the contrast in an onboard atom interferometer”, IEEE Sensors Journal, 2025, 25, 16, 30889-30896, DOI: 10.1109/JSEN.2025.3586409, HAL-05363851.

KHAMIS S.S., SULAI I.A., HAMILTON P., AFACH S., BUCHLER B., BUDKER D., FIGUEROA N.L., FOLMAN R., GAVILAN-MARTIN D., GIVON M., GRUJIC Z., GUO H., HEDGES M., JACKSON KIMBALL D.F., KIM D., KLINGER E., KORNACK T., KRYEMADHI A., KUKOWSKI N., LUKASIEWICZ G., MASIA-ROIG H., PADNIUK M., PALM C., PARK S., PENG X., POSPELOV M., PUSTELNY S., ROSENZWEIG Y., RUIMI O., SEGURA P., SCHOLTES T., SEMERTZIDIS Y., SHIN Y., STALNAKER J., TANDON D., WEIS A., WICKENBROCK A., WILSON T., WU T., ZHANG J. and ZHAO Y., “Multimessenger Search for Exotic Field Emission with a Global Magnetometer Network”, Physical Review X, 2025, 15, 031048, DOI: 10.1103/fsc8-6sl5.

KLINGER E., RIVERA-AGUILAR C.M., MURSA A., TANGUY Q., PASSILLY N. and BOUDOT R., “Cs microcell optical reference at 459 nm with short-term frequency stability below 2×10⁻¹³”, Applied Physics Letters, 2025, 126, 12, 1240003, DOI: 10.1063/5.0261771.

LIN X., HARTMAN M.T., GOLDNER P., FANG B., LE COQ Y. and SEIDELIN S., “Homogeneous linewidth behaviour of narrow optical emitters at sub-kelvin temperatures”, Applied Physics Letters, 2025, 126, 5, 054101, DOI: 10.1063/5.0249233, HAL-04816330.

LINDVALL T., PIZZOCARO M., GODUN R., ABGRALL M., AKAMATSU D. et al., “Coordinated international comparisons between optical clocks connected via fiber and satellite links, Optica, 2025, 12, 6, 843-852, DOI: 10.1364/OPTICA.561754, HAL-05157072.

LODEWYCK J. and IDO T., “Properties of a definition of the SI second based on several optical transitions”, Metrologia, 2025, 62, 6, 065003, DOI: 10.1088/1681-7575/ae033f, HAL-04997674.

PAGOT L., MERLET S. and PEREIRA DOS SANTOS F., “Influence of optical aberrations on the accuracy of an atomic gravimeter”, Optics Express, 2025, 33, 9, 18843-18854, DOI: 10.1364/OE.544378, HAL-04725143v3.

PEROUX L., DEWILDE A., KUMAR CHUTANI R., MAZZAMURRO A., BONHOMME J., MURSA A., CLÉMENT J.-F., TALBI A., PERNOD P., PASSILLY N. and MAURICE V., “Locally sealed microfabricated vapor cells filled from an ex situ Cs source”, Applied Physics Letters, 2025, 126, 14, 144003, DOI: 10.1063/5.0265624.

PÉROUX L., DEWILDE A., MURSA A., MAZZAMURRO A., BONHOMME J., TANGUY Q., KLINGER E., GAUTHIER-MANUEL L., GAIFFE O., TALBI A., BOUDOT R., PERNOD P., CLÉMENT J.-F, MAURICE V. and PASSILLY N., “Microfabricated multi-axis cell for integrated atomic devices”, Journal of Physics: Photonics, 2025, 8, 1, 015022, DOI: 10.1088/2515-7647/ae2710.

RIVERA-AGUILAR C.M., MURSA A., CARLÉ C., FRIEDT J.-M., LINGERE K., ABDEL HAFIZ M., PASSILLY N. and BOUDOT R., “Microcell atomic clock using laser current-actuated power modulation with 10¹² range stability at 1 day”, Scientific Reports, 2025, 15, 36000. DOI: 10.1038/s41598-025-19732-x.

SANTERNE A., MEHEUT H., BARRET D., BERNÉ O., BERTHIER E., DUCHARNE A., Knödlseder J., MARCHAUDON A., PELLERIN T., SPIGA A. and WOLF P., “Towards sustainable space research in France”, Nature Astronomy, 2025, 9, 4, 472-473, DOI: 10.1038/s41550-025-02506-w, HAL-04985714.

SARGSYAN A., KLINGER E., AMIRYAN-KLINGER A. and SARKISYAN D., “Features of alkali D₂ line magnetically-induced transitions excited under π-polarized laser radiation”, Physics Letters A, 2025, 539, 130372, DOI: 10.1016/j.physleta.2025.130372.

SARGSYAN A., KLINGER E., BOUDOT R. and SARKISYAN D., “Doppler-free spectroscopy of the Cs 6S_1/2 → 7P_3/2 atomic transition at 456 nm in a nanometric-thick vapor layer”, Optics Letters, 2025, 50, 10, 3229-3232, DOI: 10.1364/OL.558536.

STAAB M., BAYLE J.-B., HARTWIG O., HEES A., LILLEY M., WOAN G. and WOLF P., “Optimal design of interpolation methods for time–delay interferometry”, Classical and Quantum Gravity, 2025, 42, 11, 115002, DOI: 10.1088/1361-6382/add706, HAL-04891909.

THOMAS M., ZIANE D., ESPEL P., DOUGDAG K., BEAUDOUX F., MERLET S., ADDI N., COUËDO F. and TAUPIN M., “Calibration of two mass standards with the LNE Kibble balance in 2024”, Metrologia, 2025, 62, 6, 065006, DOI: 10.1088/1681-7575/ae1dfc, HAL-05504111.

WAGNER N., HARTMAN M., FANG B., DICKMANN J. and KROKER S.,  “Temperature-dependent mechanical losses of Eu³⁺:Y₂SiO₅ for spectral hole burning laser stabilization”, APL Materials, 2025, 13, 6, 061107, DOI: 10.1063/5.0258703, HAL-05532102.

WZIONTEK H., PÁLINKÁŠ V., ANTOKOLETZ E., MÜLLER J., …, MERLET S. et al., “Final Report on key comparison EURAMET.M.G-K2.2023 of absolute gravimeters”, Metrologia, 2025, 62, 1A, 07022, DOI: 10.1088/0026-1394/62/1A/07022, HAL-05504146.

YUN P., BOUDOT R., HAO Q. and ZHANG S., “Enhanced absorption in Doppler-free spectroscopy of the Rb atom D₁ line with monochromatic light: Application to laserfrequency stabilization”, Physical Review Applied, 2025, 23, 3, 034063, DOI: 10.1103/PhysRevApplied.23.034063.

BIZE S., « Capteurs quantiques basés sur les horloges optiques et les interféromètres atomiques : physique et applications », Conférence SFP : Potentialités offertes par la révolution quantique, Paris, France, 22 mars 2025, Conférence invitée, HAL-05473791.

BALLAND Y. and PEREIRA DOS SANTOS F., “Quectonewton local force sensor”, 59th Rencontres de Moriond – Gravitation 2025, La Thuile, Italy, La Thuile, Italy, 30 March - 6 April 2025, Guest lecture, HAL-05476997, Proccedings: HAL-05476907.

COJEAN-PALASSOÉ Q., BERTOLDI A., LANDRAGIN A. and CANUEL B., “Optimizing NN reduction in an atom interferometer network for GW detection”, 59th Rencontres de Moriond - Gravitation, La Thuile, Italy, 30 March - 6 April 2025, HAL-05116995.

ADDI N., PEREIRA DOS SANTOS F. and MERLET S., “Gravimetry platform for evaluation and characterization of quantum technologies”, EGU General Assembly 2025, Vienna, Austria, 27 April – 2 May 2025, DOI: 10.5194/egusphere-egu25-17252, HAL-05504134.

CHAFFAUT Q., LOISEAU B., GINOUX M., LESPARRE N., OLIOSO A., …, MERLET S. et al., “Detectability of the daily evapotranspiration cycle in superconducting gravimeter timeseries according to the measurement configuration”, EGU General Assembly 2025, Vienna, Austria, 27 April – 2 May 2025, DOI: 10.5194/egusphere-egu25-16741, HAL-05208033.

MERLET S., REICH M., DYKOWSKI P., VERMEULEN P., ARNAL M.  et al., “Results and findings from the worldwide first joint measurements with 5 absolute quantum gravimeters”, EGU General Assembly 2025, Vienna, Austria, 27 April – 2 May 2025, DOI: 10.5194/egusphere-egu25-16499, HAL-05504127.

WZIONTEK H., V. PÁLINKÁŠ, ANTOKOLETZ E., BAUMANN H., BERNARD J.-D., …, MERLET S. et al., “First results from the comparison of absolute gravimeters WETCAG–2024 at the Geodetic Observatory Wettzell, Germany”, EGU General Assembly 2025, Vienna, Austria, 27 April – 2 May 2025, DOI: 10.5194/egusphere-egu25-4113, HAL-05504130.

BECERRA I., PEREIRA DOS SANTOS F., BEAUFILS Q., KACZMARCZUK B. and DUCASSE G., “Cold atom accelerometer simulator for the CARIOQA mission”, INSQT Workshop 5: Space Quantum Technologies for Basic Science and Fundamental Physics, ESTEC, Noordwijk, Netherlands, 28-30 April 2025, HAL-05477411.

BIZE S., « Présentation du LNE–OP », Séance mensuelle du Bureau des Longitudes, Paris, France, 7 mai 2025, Conférence invitée, HAL-05473768.

ARCHAMBAULT L., MAJEK C., DESRUELLE B., SPARMA F., LORINI L. et al., “Preliminary accuracy budget of a cold–atom–based commercial microwave clock”, 2025 Joint Conference of the European Frequency and Time Forum (EFTF) and IEEE International Frequency Control Symposium (IFCS), Queretaro (MX), Mexico, 12-16 May 2025, HAL-05489464.

KLINGER E., RIVERA-AGUILAR C.M., MURSA A., PASSILLY N. and BOUDOT R., “Cesium microcell optical reference at 459 nm with short-term stability below 2.5×10¹³ at 1 s”, 2025 Joint Conference of the European Frequency and Time Forum (EFTF) and IEEE International Frequency Control Symposium (IFCS), , Queretaro (MX), Mexico, 12-16 May 2025, HAL-05317463.

LODEWYCK J., “Practical considerations about a definition of the SI second based on several transitions”, 2025 Joint Conference of the European Frequency and Time Forum (EFTF) and IEEE International Frequency Control Symposium (IFCS), Queretaro (MX), Mexico, 12-16 May 2025, HAL-05412278.

RIECK C., JÖNSSON G., THANH THAI T., SESIA I., ACHKAR J. et al., “Second carrier phase TWSTFT campaign in Europe employing the SRS modem”, 2025 Joint Conference of the European Frequency and Time Forum (EFTF) and IEEE International Frequency Control Symposium (IFCS), Queretaro (MX), Mexico, 12-16 May 2025, HAL-05499248.

RIVERA-AGUILAR C.M., MURSA A., FRIEDT J.-M., KLINGER E., ABDEL HAFIZ M., PASSILLY N. and BOUDOT R., “Microcell-CPT clock with reduced lightshift sensitivity using Ramsey-based sequences applied through direct modulation of the laser current”, 2025 Joint Conference of the European Frequency and Time Forum (EFTF) and IEEE International Frequency Control Symposium (IFCS), Queretaro (MX), Mexico, 12-16 May 2025, Guest lecture.

LANDA A.-K., RAHMOUNI F., GONZÁLEZ J.R., POINTARD B., LODEWYCK J. and LE TARGAT R., “Design of ultrahigh flux components for Yb transportable systems at LTE”, QAFCA 2025 - Capteurs Quantiques à Atomes Froids : mesure du Champ de pesanteur A toutes les échelles, Paris, France, 22-23 mai 2025, HAL-05093238.

PAGOT L., SIDORENKOV L., MERLET S. et PEREIRA DOS SANTOS F., “Influence of optical aberrations on the accuracy of an atomic gravimeter”, QAFCA 2025 - Capteurs Quantiques à Atomes Froids : mesure du Champ de pesanteur A toutes les échelles, Paris, France, 22-23 mai 2025, HAL-05477754.

LANDA A.-K., RAHMOUNI F., GONZÁLEZ J.R., POINTARD B., LODEWYCK J., POTTIE P.-E, DELVA P., PANET I., ROUXEL D., LUCAS S., JAMET O., LION G. and LE TARGAT R., “Transportable ¹⁷¹Yb optical lattice clock for geodetic exploration”, DIM QuanTIP - Journée anuelle 2025, Paris, France, 27 mai 2025, HAL-05093298.

RIVERA-AGUILAR C.M., MURSA A., CARLÉ C., FRIEDT J.-M., KLINGER E., ABDEL-HAFIZ M., PASSILLY N. and BOUDOT R., “Micro-horloge atomique CPT à régime d’interrogation impulsionnel avec stabilité de fréquence de 2.5×10⁻¹² à 10⁵ s”, Journée du Club Optique Micro-Onde de la SFO (JCOM), LAAS, Toulouse, France, 12 juin 2025.

TEYSSIEUX D., CALLEJO M., MILLO J., RUBIOLA E. and BOUDOT R., “Mesure du bruit de phase d’un amplificateur optique”, Journée du Club Optique Micro-Onde de la SFO (JCOM), LAAS, Toulouse, France, 12 juin 2025, HAL-05334320.

PEREIRA DOS SANTOS F., “Cold atom inertial sensors”, IAD IISU Academia Day 2025, Thiruvananthapuram, India, 18 June 2025, Guest lecture, HAL-05476989.

CHARLET D., BACK A., CHERRATI S.A., CHEIKALI C., ESNAULT C. et al., “The IDROGEN data acquisition system”, AG du GDR DI2I, Lyon, France, 18-20 juin 2025, HAL-05120726.

BACK A., CHARLET D., POTTIE P.-É., ESNAULT C., CHEIKALI C. et al., “White Rabbit development on Altera platform”, 14th White Rabbit Workshop, CERN, Geneve, Switzerland, 25-26 June 2025, HAL-05132589.

PAGOT L., GOMES J., ROL L., MYNENI N., MERLET S. et al., “Quantum optimal control for atomic interferometer, EDPIF Scientif Day, Paris, France, 30 juin 2025, HAL-05477798.

KACZMARCZUK B., PEREIRA DOS SANTOS F. et BEAUFILS Q., « Hybridation d’un interféromètre atomique avec un capteur inertiel pour la gravimétrie embarquée », Congrès Général de la Société Française de Physique, Troyes, France, 30 juin - 4 juill. 2025, HAL-05477074.

LODEWYCK J., “A definition of the SI second based on several optical transitions”, 15th European Conference on Atoms Molecules and Photons (ECAMP 2025), Innsbruck, Austria, 30 June – 4 July 2025, HAL-05412280.

POINTARD B., POTTIE P.-É., LOURS M., ABGRALL M. and LE TARGAT R., “Optical frequency division for ultra-stable microwave generation and remote clock referencing”, 5th European Conference on Atoms Molecules and Photons (ECAMP 2025), Innsbruck, Austria, 30 June – 4 July 2025, HAL-05488710.

LANDRAGIN A., “Cold atom quantum inertial sensors: a focus on geoscience applications”, Journée quantique en Nouvelle Aquitaine, Talence, France, 4 juill. 2025, HAL05504562.

PAGOT L., GOMES BAPTISTA J., ROL L., MYNENI N., CORREIA F., et al., “Quantum optimal control for sensitive atomic gravimetry”, Advances in Quantum Control – Techniques, Applications and Challenges, Dresde, Germany, 21-25 July 2025, HAL-05477419.

ACHKAR J., “Continuous Coordinated Universal Time adopted by the ITU”, IAU Symposium 401 on Advancing Reference Systems, Ephemeris, and Standards – From the Earth and the Moon to Solar System Bodies, International Astronomical Union, La Plata, Argentina, 4 August 2025, Guest lecture, HAL-05499234.

KLINGER E., RIVERA-AGUILAR C.M., MURSA A., TANGUY Q., PASSILLY N. and BOUDOT R., “Cesium microcell optical reference at 459 nm with a frequency stability in the low 10⁻¹³ range at 1 s”, Quantum Optics XI, Cracovie, Poland, 1-5 Sept. 2025, HAL-05334629.

MERLET S., DYKOWSKI P., CARBONE D., SEOANE L. and REICH M., “European QUantum Infrastructure Project for Gravimetry (EQIP-G)”, IAG Scientific Assembly 2025, Rimini, Italy, 1-5 Sept. 2025, https://hal.science/hal-05504121.

PAGOT L., SIDORENKOV L. and PEREIRA DOS SANTOS F., « Capteurs quantiques à atomes froids : mesure du champ de pesanteur à toutes les échelles”, QAFCA Synergy 2025, CNRS, Paris, France, 2-3 sept. 2025, HAL-05477808.

GOMES BAPTISTA J., PAGOT L., ROL L., MYNENI N., SIDORENKOV L. et al., “Optimal quantum control and optical beam shaping for atomic gravi–gradiometer”, Second DPG Fall Meeting 2025, Göttingen, Germany, 8-12 Sept. 2025, HAL-05477187.

MYNENI N., GOMES BAPTISTA J., MERLET S., SIDORENKOV L., JANVIER C. et al., “Top-hat laser beams for accurate quantum gravity sensing”, Second DPG Fall Meeting 2025, Gottingen, Germany, 8-12 Sept. 2025, HAL-05477211.

ROBBES A., YUAN Y., GOLDNER P., ALEXANDRE C., SEIDELIN S. et al., “Sub-Kelvin spectral hole burning in Eu:YSO for laser frequency stabilisation”, Rare-Earth Ion for Quantum Information (REIQI), Nice, France, 16-18 Sept. 2025, HAL-05503822.

YUAN Y., ROBBES A., BOSCHER N., ALEXANDRE C., GOLDNER P. et al., “Spectral hole burning in Eu:YSO for low-frequency acceleration sensing”, Rare-earth Ions for Quantum Information Workshop (REIQI), Nice, France, 16-18 Sept. 2025, HAL-05484499.

BIZE S., FANG F., PEIK E. and PANFILO G., “Task Force for the redefinition of the second subgroup Ooptions: Report to the 24th CCTF”, 24th Consultative Committee for Time and Frequency, BIPM, BIPM, Sèvres, France, 18-19 Sept. 2025, Guest lecture, HAL-05473895.

BIZE S. and MATUS M., “CCL-CCTF working group on frequency standards: Report to the 24th CCTF”, 24th Consultative Committee for Time and Frequency, BIPM, BIPM, Sèvres, France, 18-19 Sept 2025, Guest lecture, HAL-05473875.

LANDRAGIN A., “Precise measurements with quantum sensors based on atom interferometry: an opportunity for the geosciences”, 21^st Rencontres du Vietnam : 100 Years of Quantum Physics, ICISE, Quy Nhon, Vietnam, 6-9 oct. 2025, HAL-05504548.

LE TARGAT R., RAHMOUNI F., ZYSKIND C., CIFUENTES MARIN M.A., PIERRE EBERSCHWEILER et al., “Optical lattice clocks at LTE: Progress and applications to Earth Sciences, Assemblée Générale de FIRST-TF 2025, Rennes, France, 8 oct. 2025, Conférence invitée, HAL-05494764.

YADAV N., TUCKEY P., ABGRALL M., AMY-KLEIN A., CHARDONNET C. et al., “Automated simultaneous precise time calibration of White Rabbit switches for REFIMEVE”, First-TF Annual Meeting 2025, Workshop ”Application of Time-Frequency technologies to defence and space”, Rennes University, Rennes, France, 8 oct. 2025, HAL-05500940.

PEREIRA DOS SANTOS F., “CARIOQA - Quantum accelerometry for space geodesy, Workshop « Application des technologies du Temps-Fréquence au domaine de la défense et du spatial », Rennes, France, 9 oct 2025, HAL-05477005.

POINTARD B., Lisa France Collaboration, Le Targat R. and Bize S., “Iodine stabilized laser modules for LISA ground test campaigns”, Workshop de First-TF, « Application des technologies du Temps–Fréquence au domaine de la défense et du spatial », Rennes, France, 9 oct. 2025, HAL-05503858.

MÉMIN A., BERNARD J.-D., BONVALOT S., BOY J.-P., BOYER D. et al., « Le Service National d’Observation Gravimétrie SNOG », G2 2025 Géodésie et géophysique depuis l’espace, Toulouse, France, 13-15 oct. 2025, HAL-05313949.

PEREIRA DOS SANTOS F., BALLAND Y. et ABSIL L., “Local force measurements with a trapped atom interferometer”, Journées annuelles du GDR Gaz Quantiques, Palaiseau, France, 15 oct. 2025, HAL-05477015.

BOUDOT R., PASSILLY N., MAURICE V., KLINGER E., TANGUY Q., RIVERA-AGUILAR C.M., CARLÉ C., ABDEL-HAFIZ M. and MURSA A., “Atomic clocks based on hot alkali vapor microfabricated cells”, 2025 IEEE SENSORS, Vancouver, BC, Canada, 19-22 Oct. 2025, Guest lecture, DOI: 10.1109/SENSORS59705.2025.11330570.

POPOV K., KAJI H., KOBAYASHI T., MARTENS A., CHARLET D. et al., “Study of laser beam arrival time synchronization towards sub–picosecond stability level”, International Workshop on Future Linear Colliders 2025, Valencia, Spain, 20-24 Oct. 2025, HAL-05443579.

EBERSCHWEILER P., LODEWYCK J. and HOLLEVILLE D., “Advanced Quantum clock for Real world Applications”, Les Houches School on Quantum Metrology, Les Houches, France, 20-31 oct. 2025, HAL-05503820.

LANDA A.K., PEARLSTEIN M., RAHMOUNI F., GONZÁLEZ J.R., POINTARD B. et al., “Towards a transportable ¹⁷¹Yb optical lattice clock for geodetic exploration”, Les Houches School on Quantum Metrology, Ecole de Physique, Les Houches, France, 20-31 oct. 2025, HAL-05493854.

PEREIRA DOS SANTOS F., BALLAND Y. and ABSIL L., “Measuring short range forces with quectonewton stability, 3^e colloque du GdR TeQ du CNRS, Grenoble, France, 12 nov. 2025, Conf. invitée, HAL-05477020.

ADDI N., CALDANI R. et MERLET S., “Absolute Quantum Gravimeter AQG–B01 of PIN PGravi: characterisation and use in 2025”, Rencontres Epos-France, Sète, France, 18-21 nov. 2025, HAL-05504136.

MERLET S., “European QUantum Infrastructure Project for Gravimetry, Rencontres Epos-France, Sète, France, 18-21 nov. 2025, HAL-05504114.

MERLET S., SEOANE L., MEMIN A., LEMOIGNE N., PAJOT-MÉTIVIER G. et al., « Bilan scientifique et technique, et prospective en Gravimétrie », Rencontres Epos-France, Sète, France, 18-21 nov. 2025, HAL-05504142.

BIZE S., « Horloges optiques et applications, Séminaire DGA Capteurs Quantiques, Bruz, France, 27 nov. 2025, Guest lecture, HAL-05473778.

Bize S., “Optical clock comparisons in Europe, Assemblée Générale 2025 de REFIMEVE, Grenoble, France, 1-2 déc 2025, Conf. invitée, HAL-05473750.

YADAV N., TUCKEY P., ABGRALL M., POTTIE P.-E., CANTIN E., et al., “Automated parallel precise time calibration of White Rabbit switches for T-Refimeve, Assemblée Générale 2025 de REFIMEVE, Grenoble, France, 1-2 déc 2025, Conf. invitée, HAL-05501105.

ACHKAR J., “Time signals and frequency standard emissions”, Seminar on Science Services in relation to ITU RR and WRC–27, MCMC, Selangor, Malaysia, 9-10 Dec. 2025, Guest lecture, HAL-05499239.

This work presents the groundwork for an ultrastable optical frequency reference based on the quantum phenomenon of superradiance, with both theoretical modeling and experimental implementation. A superradiant laser results from the collective emission of an atomic ensemble in an optical cavity, and it can show frequency stability largely independent of cavity fluctuations.

The system studied in this thesis is composed of cold ytterbium atoms coupled to a Fabry-Perot cavity operating in the bad-cavity regime, with a special focus on the criteria required to reach a continuous superradiant emission. The experimental work follows the scheme developed at the FEMTO-ST Institute, aimed at reaching continuous superradiant operation through sequential atomic transport. It focuses on the preparation of cold atoms, the characterization of the atomic transport, and the development of the repumping scheme necessary to maintain population inversion. These efforts are done in parallel with the development of a theoretical description based on a Lindblad master equation and numerical calculations realized in collaboration with the UTINAM Institute to model the atom-cavity dynamics.

The numerical results describe the behavior of the system and predict key parameters such as the expected linewidth and output power. Such developments constitute a fundamental step for the realization of the continuous superradiant laser project and the basis for a full theoretical description.

time and frequency metrology, superradiance, cold atoms.

Full document (EN) : TEL-05603280

This thesis presents advancements in the development of a transportable ytterbium single-ion optical clock, focusing on the integration of a microfabricated surface electrode trap into the experimental setup. The research explores the optimization of ion trapping systems to enhance stability, targeting applications in precision metrology, fundamental physics, and geodesy.

The work addresses the theoretical principles of ion trapping, highlighting the challenges posed by micromotion, motional heating, and quantum projection noise, as well as the strategies for overcoming these limitations. It also investigates the detection processes and the interplay between trap design and clock performance. A comprehensive approach combines theoretical modeling, electrical testing, and experimental measurements to refine the trap’s design and operation. The experimental setup integrates stabilized lasers, optimized RF and DC voltage controls, and ultra-high vacuum systems to trap and interrogate ¹⁷¹Yb⁺ ions effectively.

Notable achievements include the stabilization of laser frequencies to a hollow cathode Yb lamp, achieving fractional frequency stability below 10⁻⁹, and the design of a high-quality RF resonator with significantly improved performance. Enhanced vacuum levels and a new dispenser design led to more efficient ion loading and extended trap lifetimes. The study also highlights challenges encountered in the trap’s operation, including unexpected voltage breakdown behaviors, and suggests future improvements in chip design and microfabrication processes. These findings offer valuable insights into the limitations and potential of microfabricated surface traps in optical clock applications.

In conclusion, this research advances the understanding and implementation of surface ion traps, contributing to the development of compact and transportable optical atomic clocks. The results provide a strong foundation for further innovation, addressing existing challenges while paving the way for new applications in precision timekeeping and related fields.

spectroscopy, time and frequency metrology, single-ion trapping, laser cooling, atomic clock.

Full document (EN) : TEL-05603323

This PhD focuses on the development of resonators and oscillators for telecommunications, where increasing frequency and maintaining stability are major challenges. The main objective was to design, fabricate, and validate an HBAR resonator operating around 1 GHz, meeting requirements for miniaturization, low power consumption, and mechanical robustness.

After a comparative study of key technologies (SAW, MEMS, DRO, BAW, FBAR, SMR), the HBAR technology was selected for its high-quality factor, ability to operate at high frequencies, and compatibility with microfabrication processes. Several HBAR configurations were investigated. One of the proposed configuration was the HBAR on LiNbO₃/quartz, which provides a good frequency stability and low insertion losses. Fabrication was achieved through wafer bonding and thinning, enabling optimal thicknesses and orientations. Over 2 000 resonators were produced, with performances matching simulations (Q > 6 000, TCF≈ –5 ppm/°C, insertion losses < 12 dB). Several challenges were overcome, including thickness uniformity, insertion losses due to pads, and the management of cracks in piezoelectric material, thanks to trimming techniques, electrode geometry optimization, and reduction of thermomechanical stresses.

A fundamental challenge was the selection of a single harmonic among the many presents in the HBAR spectrum. An innovative method was developed, based on injecting an external frequency or phase and using the moiré principle, which was validated by simulation. Finally, the thesis led to the proposal of a first HBAR resonator design meeting the main requirements, as well as an architecture enabling precise selection of a single harmonic around 1 GHz.

oscillator, HBAR, resonator, laterally coupled resonator, micromanufacturing, telecommunications, high-overtone bulk acoustic resonators.

Full document (EN/FR) : Confidential until 31/12/2028.

This PhD thesis work aims to explore further the CPT (Coherent Population Trapping) approach for the demonstration of high-performance microwave Cesium vapor cell clocks.

We begin with a thorough metrological characterization of a first clock. This clock uses an optimized pumping scheme named push-pull optical pumping (PPOP) and an pulsed interrogation technic (Ramsey-CPT or SABR-CPT, Symmetric Auto-Balanced Ramsey). A frequency stability at 1 s of 1×10⁻¹³ in Ramsey-CPT mode and 2×10⁻¹³ in SABR-CPT mode was demonstrated. We then measured dependencies of the clock frequency to numerous experimental parameters and demonstrated that the SABR-CPT sequence induces a drastic reduction of numerous dependency coefficients. A stability budget of 3.5×10⁻¹⁴ at 1 day was established. The temperature of passive optical components, the laser frequency, the microwave power and the magnetic field are main contributions to date. A degradation of the clock’s performances for 𝜏 ≥ 100 s was also observed. Numerous investigations were conducted to understand its source.

The second research axis consisted in the design and development of a clock, with a comparable architecture but more compact (optical bench < 10 L). Following its design and its assembly, first characterizations of this clock were reported, such as the spectroscopy of the CPT resonance in both the continuous and the Ramsey-CPT regime. Some frequency shifts measurements are also reported. This clock also demonstrated a preliminary fractional frequency stability of 1.5×10⁻¹¹ at 1 s, and 2.5×10⁻¹² at 10⁵ s in Ramsey-CPT.

Allan deviation, atomic clock, frequency shift, frequency stability, vapor cell.

Full document (FR) : TEL-05411125

This thesis presents the initial steps toward the realization of an ultra-stable superradiant oscillator. It explores the use of the quantum phenomenon of superradiance, which leverages the coherence and indistinguishability of an atomic ensemble to enhance coherent optical radiation. A superradiant laser consists of atoms collectively coupled to a Fabry-Perot cavity, operating in the bad-cavity regime to minimize sensitivity to cavity fluctuations.

In this work, the first realization and characterization of a cold ytterbium atomic ensemble are demonstrated, laying the foundation for future superradiant operation. The experimental setup for atomic transport into the cavity has been planned, enabling sequential loading of atoms for quasi-continuous superradiant emission.

To support the future characterization of the superradiant laser, a compensated optical fiber link for local ultra-stable frequency transfer has been implemented. This system features fully digital signal processing and a novel characterization method that does not require access to the remote fiber end. The achieved fractional frequency instability reaches the 10⁻¹⁸ range, demonstrating its suitability for high-precision frequency dissemination within an institute.

superradiance, atomic clock, ultra-stable oscillator.

Full document (EN) : TEL-05158291

This thesis establishes a solid foundation for the superradiant ultra-stable laser built at FEMTO-ST. The work focuses on the stable references required for the operation of such laser emphasizing two key contribution: a 556 nm laser frequency stabilization to perform a magneto-optical-trap on the intercombination line of ¹⁷¹Yb and a compact tunable Fabry-Perot cavity, crucial for superradiant lasing.

We demonstrate an offset sideband frequency lock of the 556 nm laser using a single electrooptical modulator, covering the frequency gap between the reference iodine vapor cell and ¹⁷¹Yb, and to perform lock-in detection. Sub-Doppler saturated spectroscopy is performed through the vapor, generating an error signal to frequency lock the laser. A characterization setup is implemented with an optical frequency comb, where the 556 nm laser fractional frequency stability is measured to be 1.2×10^–11 at one second. Through meticulous estimation of systematic shifts, a few kilohertz accuracy is obtained.

Finally, we propose a low noise tunable compact Fabry-Perot cavity design, suitable for the superradiant lasing in a metrologically relevant regime. A controlled assembly of the cavity is proposed alongside with its ultra-high vacuum system. Subsequently, finesse and frequency stability characterization is performed using a 578 nm laser frequency locked to the resonator with a Pound-Drever-Hall scheme. A finesse ℱ of 6920 is measured through various techniques while the stability is measured to be 2.2×10^–12 at one second. Such preliminary results constitute a solid foundation for the superradiant laser.

time and frequency metrology, active optical clock, superradiance, Fabry-Perot cavity, sub-Doppler spectroscopy.

Full document (EN) : TEL-05483152

Correlations between the internal and external degrees of freedom of neutral atoms enable state-of-the-art accuracy and sensitivity in inertial sensors. This thesis presents the latest developments in the absolute cold-atom gravimeter (CAG) of the LTE, based on momentumstate interferometry using Raman transitions in a freely falling atomic cloud of ⁸⁷Rb.

We identify intensity inhomogeneities as a primary source of contrast loss in the CAG and highlight the role of non-resonant interactions resulting from the counterpropagating geometry of the Raman beams. Following optimization of the optical setup, the interferometer contrast improved by nearly 10 %, with local intensity-related features successfully eliminated. Additionally, we identified bias phases arising from intensity variations, predominantly during the mirror pulse. We introduce a dynamical method for evaluating these phase shifts, which generalizes the traditional adiabatic approximation. This method enables us to distinguish between phase shifts caused by two-photon processes and those of other origins. Crucially, it links the population of stray momentum states to the accumulation of nonlinear phase shifts at the interferometers output ports.

We report a systematic bias in the measurement of g at the level of 5×10⁻⁹ g, attributed to intensity inhomogeneities, and a sensitivity of 20×10⁻⁹ g Hz^−1/2.

atomic interferometry, gravimeter, inertial sensor, adiabatic approximation.

Full document (EN) : TEL-05450855

This thesis focuses on the design of an optical lattice clock, developed at the LTE laboratory, using a new atomic species for the team: the neutral ¹⁷¹Yb atom. The clock was developed with particular attention paid to its portability. The work includes the installation of a vacuum system, laser cooling stages, and frequency stabilisation techniques, all designed for on-site use and for compatibility with remote frequency reference distribution systems.

frequency metrology, optical clock, portable clock, cold atoms, ultra-stable lasers.

Full document (EN) : HAL-TEL-05424143