A5020224105- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Geophysics and Sensor Technology
- Advanced Materials Characterization Techniques
- Quantum Mechanics and Applications
- Quantum Information and Cryptography
- Scientific Measurement and Uncertainty Evaluation
- Mechanical and Optical Resonators
- Experimental and Theoretical Physics Studies
- Quantum optics and atomic interactions
- Pickering emulsions and particle stabilization
- Surfactants and Colloidal Systems
- Quantum Electrodynamics and Casimir Effect
- Force Microscopy Techniques and Applications
- Enhanced Oil Recovery Techniques
- Iron oxide chemistry and applications
- Radioactive Decay and Measurement Techniques
- Quantum, superfluid, helium dynamics
- Advanced X-ray Imaging Techniques
- Soil and Unsaturated Flow
- Clay minerals and soil interactions
- Electron and X-Ray Spectroscopy Techniques
- NMR spectroscopy and applications
- Digital Holography and Microscopy
Leibniz University Hannover
2012-2024
Australian National University
2009
University of Delaware
2001
Stony Brook University
2001
National Synchrotron Light Source II
2001
Kiel University
1998-2000
This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around world to discuss exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter gravitational waves. primary objective was lay groundwork an international TVLBAI proto-collaboration. collaboration aims unite researchers different institutions strategize...
Metal partitioning in ferrihydrite suspensions may reach equilibrium only after a long reaction time. To determine key factors controlling the kinetics, we measured Cu and Pb uptake as function of morphology, temperature, metal competition, fulvic acid concentration over period 2 months. X-ray microscopy, which was used to probe morphology suspension, showed that drying irreversibly converted gellike structure fresh precipitate into dense aggregates. These aggregates sorbed much slower than...
We realize beam splitters and mirrors for atom waves by employing a sequence of light pulses rather than individual ones. In this way we can tailor interferometers with improved sensitivity accuracy. demonstrate our method composite creating symmetric matter-wave interferometer which combines the advantages conventional Bragg- Raman-type concepts. This feature leads to an high immunity technical noise allowing us devise large-area Sagnac gyroscope yielding phase shift 6.5 rad due Earth's...
We demonstrate a quantum gravimeter by combining the advantages of an atom chip for generation, delta-kick collimation, and coherent manipulation freely falling Bose-Einstein condensates (BECs) with innovative launch mechanism based on Bloch oscillations double Bragg diffraction. Our high-contrast BEC interferometer realizes tens milliseconds free fall in volume as little one centimeter cube paves way measurements sub-μGal accuracies miniaturized, robust devices.Received 13 May...
Inertial sensors based on cold atoms have great potential for navigation, geodesy, or fundamental physics. Similar to the Sagnac effect, their sensitivity increases with space-time area enclosed by interferometer. Here, we introduce twin-lattice atom interferometry exploiting Bose-Einstein condensates. Our method provides symmetric momentum transfer and large areas in palm-sized sensor heads a performance similar present meter-scale devices.
We propose a terrestrial detector for gravitational waves with frequencies between 0.3 and 5 Hz based on atom interferometry. As key elements, we discuss two symmetric matter-wave interferometers, the first one single loop second featuring folded triple-loop geometry. The latter eliminates need atomic ensembles at femtokelvin energies imposed by Sagnac effect in other interferometric detectors. geometry also combines several advantages of current vertical horizontal matter wave antennas...
We employ light-induced double Bragg diffraction of delta-kick collimated Bose-Einstein condensates to create three symmetric Mach-Zehnder interferometers. They rely on (i) first-order, (ii) two successive and (iii) second-order processes which demonstrate the scalability corresponding momentum transfer. With respect devices based conventional scattering, these interferometers scale factor feature a better suppression noise systematic uncertainties intrinsic process. Moreover, we utilize as...
We propose a very long baseline atom interferometer test of Einstein's equivalence principle (EEP) with ytterbium and rubidium extending over 10m free fall. In view existing parametrizations EEP violations, this choice masses significantly broadens the scope interferometric tests respect to other performed or proposed by comparing two elements high atomic numbers. first step, our experimental scheme will allow reaching an accuracy in E\"otv\"os ratio $7\times 10^{-13}$. This achievement...
Compared to light interferometers, the flux in cold-atom interferometers is low and associated shot noise large. Sensitivities beyond these limitations require preparation of entangled atoms different momentum modes. Here, we demonstrate a source that compatible with state-of-the-art interferometers. Entanglement transferred from spin degree freedom Bose-Einstein condensate well-separated modes, witnessed by squeezing parameter -3.1(8) dB. Entanglement-enhanced atom promise unprecedented...
Microgravity eases several constraints limiting experiments with ultracold and condensed atoms on ground. It enables extended times of flight without suspension eliminates the gravitational sag for trapped atoms. These advantages motivated numerous initiatives to adapt operate experimental setups microgravity platforms. We describe design payload, motivations choices, capabilities Bose-Einstein Condensate Cold Atom Laboratory (BECCAL), a NASA-DLR collaboration. BECCAL builds heritage...
Recent developments in quantum technology have resulted a new generation of sensors for measuring inertial quantities, such as acceleration and rotation. These can exhibit unprecedented sensitivity accuracy when operated space, where the free-fall interrogation time be extended at will environment noise is minimal. European laboratories played leading role this field by developing concepts tools to operate these relevant environment, parabolic flights, towers, or sounding rockets. With...
We observe coherent, cw, 455 nm blue-beam production via frequency upconversion in cesium vapor. Two IR lasers induce strong double excitation a heated vapor cell, allowing the atoms to undergo cascade and produce collimated, blue beam copropagating with two pump lasers.
We report on the realization of a compact atomic Mach–Zehnder-type Sagnac interferometer 13.7 cm length, which covers an area 19 mm2 previously reported only for large thermal beam interferometers. According to Sagnac's formula, holds both light and atoms, sensitivity rotation rates increases linearly with enclosed by interferometer. The use cold atoms instead enables miniaturization interferometers without sacrificing areas. In comparison beams, slow offer better matching initial velocity...
In a quantum version of the twin paradox, atom interferometers generate one clock, aging at different rates simultaneously.
Abstract The use of solid-laden emulsions (Pickering emulsions) provides an interesting alternative to normal because the need for organic surfactants is removed or reduced. Combination a bentonite with layered double hydroxide represents effective emulsifying system and high stability against coalescence. Solid contents as low 0.1% (w/w, related total mass emulsion) are sufficient prepare very stable O/W emulsions; ratio hydroxide/bentonite not critical but should vary between 0.25 4...
Gravitational Waves (GWs) were observed for the first time in 2015, one century after Einstein predicted their existence. There is now growing interest to extend detection bandwidth low frequency. The scientific potential of multi-frequency GW astronomy enormous as it would enable obtain a more complete picture cosmic events and mechanisms. This unique entirely new opportunity future astronomy, success which depends upon decisions being made on existing infrastructures. prospect combining...
We provide a comprehensive study of atomic Raman and Bragg diffraction when coupling to pair counterpropagating light gratings (double diffraction) or single one (single discuss the transition from case other in retroreflective geometry as Doppler detuning changes. In contrast diffraction, double loses its advantage high efficiency for short pulses has be performed Bragg-type regime. Moreover, structure leads further limitations broad momentum distributions on mirror pulses, making use...
Abstract The sensitivity of light and matter-wave interferometers to rotations is based on the Sagnac effect increases with area enclosed by interferometer. In case light, latter can be enlarged forming multiple fibre loops, whereas equivalent for remains an experimental challenge. We present a concept multi-loop atom interferometer scalable formed pulses. Our method will offer sensitivities as high $$2\times 10^{-11}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow>...
Abstract Quantum sensors based on light pulse atom interferometers allow for measurements of inertial and electromagnetic forces such as the accurate determination fundamental constants fine structure constant or testing foundational laws modern physics equivalence principle. These schemes unfold their full performance when large interrogation times and/or momentum transfer can be implemented. In this article, we demonstrate how interferometry benefit from use Bose–Einstein condensed sources...