Conveners
Session: 1. Welcome and Introduction
- There are no conveners in this block
Session: 2. Physics cases
- Surjeet Rajendran
- Ernst Maria Rasel
Session: 3. Long Baseline Interferometers
- Sven Abend
- Naceur Gaaloul
Session: 4. Atom Sources
- Hendrik Heine (Leibniz University Hannover)
- Dennis Schlippert
- Jan Rudolph (Stanford University)
Session: 5. Squeezing
- Robin Corgier (LTE, Observatoire de Paris)
- Carsten Klempt (Leibniz University Hannover)
Session: 6. Metrology
- Michael Werner (Institute Of Quantum Optics Hannover)
- Benjamin CANUEL (LP2N, Laboratoire Photonique, Numรฉrique et Nanosciences, Universitรฉ Bordeaux-IOGS-CNRS:UMR 5298, 1 rue F. Mitterrand, F-33400 Talence, France)
Session: 7. Laser Gravitational Wave Detection
- Michรจle Heurs
- John Ellis (Kings College London)
Session: 8. Dark Matter & Dark Energy
- Marianna Safronova (University of Delaware)
- Elina Fuchs
Session: 9. Sites & Geodesy
- Manuel Schilling (DLR)
- Jeremiah Mitchell
- Annike Knabe (Institute of Geodesy, Leibniz University Hannover)
Session: 10. Space
- Naceur Gaaloul
- Ernst Maria Rasel
- Marianna Safronova (University of Delaware)
Session: Closing Remarks
- There are no conveners in this block
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Naceur Gaaloul8/20/25, 10:30โฏAMTalk
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Oliver Buchmuller (Imperial College (GB))8/20/25, 11:15โฏAMTalk
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Marianna Safronova (University of Delaware)8/20/25, 1:00โฏPMTalk
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Saรฏda GUELLATI-KHELIFA (Laboratoire Kastler Brossel)8/20/25, 1:30โฏPMTalk
In this talk, I will present our recent work on in situ measurement of the spatial distribution of photon momentum across a laser beam. We use a Bose-Einstein condensate (BEC) as a mobile probe. By moving the BEC, we measure the photon recoil at various positions using an atom interferometer, enabling us to reconstruct a two-dimensional map of the local intensity and dispersion of the wave...
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Naceur Gaaloul8/20/25, 2:00โฏPMTalk
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Jan Rudolph (Stanford University)8/20/25, 3:00โฏPMTalk
Clock atom interferometry is an emerging technique in precision measurements that is particularly well suited for sensitivity enhancement through large momentum transfer (LMT). While current systems have demonstrated momentum separations of several hundreds of photon momenta, next-generation quantum sensors are targeting an LMT enhancement factor beyond $10^4$. We present some of the major...
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Andrea Bertoldi8/20/25, 3:20โฏPMTalk
We present the current status of the MIGA experiment, highlighting the installation of the 150-meter-long underground vacuum system at the LSBB (Low-Noise Underground Laboratory). Ongoing experimental developments and associated activities will also be discussed.
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Lin Zhou8/20/25, 3:40โฏPMTalk
Large momentum transfer (LMT) is an important way to improve the sensitivity of atom interferometers (AIs). Compared with single-species AIs, the LMT method for dual-species AIs is further limited by factors such as the compatibility of experimental parameters and differences in recoil frequency. In this report, we will introduce an LMT method for dual-species AIs based on double-diffraction...
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Dennis Schlippert8/20/25, 4:00โฏPMTalk
Very Long Baseline Atom Interferometry (VLBAI) enables ground-based atomic matter-wave interferometry on large scales in space and time. With shot noise-limited instabilities better than $10^{โ9} \, \mathrm{m}/\mathrm{s}^2$ at 1 s at the horizon, the Hannover VLBAI facility may compete with state-of-the-art superconducting gravimeters, while providing absolute instead of relative gravity...
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Carsten Klempt (Leibniz University Hannover)8/21/25, 9:00โฏAMTalk
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Dr Christian Freier (Nomad Atomics GmbH)8/21/25, 9:20โฏAMTalk
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Dr Anna Marchant8/21/25, 9:40โฏAMTalk
High flux, cold atomic sources are key in the development of long baseline atom interferometers designed to study gravitational waves and the effects of dark matter [1]. By increasing the number of atoms in each interferometry sequence, it is possible to enhance the detector performance, pushing to even greater sensitivities.
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The presence of a long-lived โclockโ state in strontium makes it... -
Henning Vahlbruch (Albert Einstein Institute Hannover)8/21/25, 10:30โฏAMTalk
Quantum noise imposes a fundamental limitation on the sensitivity of laser interferometric gravitational-wave detectors manifesting as shot noise and quantum radiation pressure noise. The impact of quantum fluctuations on gravitational-wave detection can be mitigated through the application of squeezed vacuum states of light. We present the current status of squeezed light application in the...
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Luca Pezzรจ8/21/25, 10:50โฏAMTalk
Distributed quantum sensing is at the forefront of multiparameter quantum
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metrology [1], offering a powerful framework where quantum states are spatially
distributed among multiple sensing nodes to enable the simultaneous estimation
of several parameters. In this talk. I will analyze a sensor composed by a network of spatially
distributed Mach-Zehnder interferometers (MZIs) [2,3,4].... -
Philipp Treutlein8/21/25, 11:10โฏAMTalk
In quantum metrology, entangled states of many-particle systems are investigated to enhance measurement precision of the most precise clocks and field sensors. While single-parameter quantum metrology is well established, many metrological tasks require joint multiparameter estimation, which poses new conceptual challenges that have so far only been explored theoretically. We experimentally...
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Richard Hobson8/21/25, 11:30โฏAMTalk
A key motivation for very long baseline atom interferometry (VLBAI) is to build detectors for gravitational waves in the O(100 mHz) band. However, gravitational wave detection will require the atom phase to be measured with extremely low noise, well below 1 mrad/shot. An important tool will be to use as many atoms as possible in the VLBAI. However, further reductions of phase noise could be...
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Prof. Jeffrey Scott Hangst (Aarhus University (DK))8/21/25, 1:00โฏPMTalk
The ALPHA experiment at CERN is unique in its demonstrated ability to study the physical properties of antihydrogen โ the antimatter equivalent of the simplest atom. Such studies are motivated by the apparent absence of antimatter in the observable universe, and they probe the fundamental symmetries that underlie current theory. For example, the Standard Model requires that hydrogen and...
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Alessandro Spallicci (Universitรฉ d'Orlรฉans - CNRS)8/21/25, 1:20โฏPMTalk
We assess whether Extended Theories of Electro-Magnetism (ETEM) induce a (partial) reinterpretation of the laws in physics, bearing an impact on cosmology. The SM Extension (SME) or Non-Linear Electro-Magnetism dress the photon with an effective mass [1-3], the only free massless particle remained in the SM. Such a mass is compatible with the upper limits obtained through Fast Radio Bursts...
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Dr Charles Baynham (Imperial College London)8/21/25, 1:40โฏPMTalk
We present a tabletop prototype of a single-photon long-baseline atom interferometer using the 87Sr clock transitionโโa type of quantum sensor designed to search for dark matter and gravitational waves. Our prototype detector operates at the Standard Quantum Limit (SQL), producing a signal with no unexpected noise beyond atom shot noise. Importantly, the detector remains at the SQL even when...
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Alexandre Gauguet (Universitรฉ de Toulouse)8/21/25, 2:00โฏPM
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Dr Harald Lรผck (Leibniz University Hannover)8/21/25, 3:00โฏPMTalk
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Michรจle Heurs8/21/25, 3:20โฏPMTalk
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David Keitel8/21/25, 3:40โฏPMTalk
Almost exactly 10 years ago, and after decades of previous work on detector and data analysis technology, ground-based laser-interferometric detectors opened the gravitational-wave window onto the Universe. Since that first detection of a black-hole merger, hundreds of high-significance signals have been found from a variety of compact binary coalescences. These have already enabled many new...
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Prof. John Ellis (Kings College London)8/21/25, 4:00โฏPMTalk
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Christopher McCabe (King's College London)8/22/25, 9:00โฏAMTalk
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Surjeet Rajendran8/22/25, 9:20โฏAMTalk
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Diego Blas (ICREA/IFAE)8/22/25, 9:40โฏAMTalk
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Dr Jeremiah Mitchell8/22/25, 10:30โฏAMTalk
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Sergio Calatroni (CERN)8/22/25, 10:50โฏAMTalk
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Mohamed Sobh8/22/25, 11:10โฏAMTalk
Over the past two years, we have gained operational experience with Absolute Quantum Gravimeters (AQGs), focusing on their performance, calibration, and integration with classical gravimetric techniques. In January 2024, we conducted the worldโs first dedicated AQG comparison at Leibniz University Hannover, involving five commercial B-series units over five days. Measurements included 12-hour...
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Paul Scovell (STFC)8/22/25, 11:30โฏAMTalk
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Luigi Cacciapuoti (European Space Agency)8/22/25, 1:00โฏPMTalk
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Christian Schubert (DLR, Institute for Satellite Geodesy and Inertial Sensing)8/22/25, 1:20โฏPMTalk
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Vitali Mรผller (Albert Einstein Institute)8/22/25, 1:40โฏPMTalk
Satellite gravimetry missions map Earthโs time-variable gravity field to quantify mass redistribution within the Earth system, enabling global observations of ice-sheet and glacier mass change, terrestrial water storage, ocean mass and circulation, and solid-Earth processes. These measurements underpin climate and hydrological assessments by providing a continuous, homogeneous record of mass...
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Mingsheng Zhan (Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences)8/22/25, 2:00โฏPMTalk
Space-borne cold atom interferometers (CAIs) enable unprecedented tests of fundamental physics. Here we report new progress in the dual-species atom interferometer operating aboard the China Space Station (CSS) [1-2]. By implementing synchronous $^{85}$Rb-$^{87}$Rb interferometry with 50 ms interrogation time, we achieve 13-fold vibration noise suppression via differential phase measurement....
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