Ernst M. Rasel
A5006351379- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Quantum Mechanics and Applications
- Scientific Measurement and Uncertainty Evaluation
- Geophysics and Sensor Technology
- Quantum Information and Cryptography
- Radioactive Decay and Measurement Techniques
- Advanced Fiber Laser Technologies
- Quantum, superfluid, helium dynamics
- Quantum optics and atomic interactions
- Advanced Materials Characterization Techniques
- Dark Matter and Cosmic Phenomena
- Experimental and Theoretical Physics Studies
- Spectroscopy and Laser Applications
- Mechanical and Optical Resonators
- Cosmology and Gravitation Theories
- Relativity and Gravitational Theory
- Noncommutative and Quantum Gravity Theories
- Atomic and Molecular Physics
- Quantum Electrodynamics and Casimir Effect
- Solid State Laser Technologies
- Astro and Planetary Science
- Laser-Matter Interactions and Applications
- Advanced Thermodynamics and Statistical Mechanics
Leibniz University Hannover
2016-2025
Leibniz Association
2023
University of Bremen
2016-2020
Applied Photonics (United Kingdom)
2019
Systèmes de Référence Temps-Espace
2018
SpaceTech (Germany)
2016
Institute for Applied Systems Technology Bremen
2016
Institute for Quantum Optics and Quantum Information Innsbruck
2011
Universität Ulm
2009
Louisiana State University
2009
Atom interferometers covering macroscopic domains of space-time are a spectacular manifestation the wave nature matter. Because their unique coherence properties, Bose-Einstein condensates ideal sources for an atom interferometer in extended free fall. In this Letter we report on realization asymmetric Mach-Zehnder operated with condensate microgravity. The resulting interference pattern is similar to one far field double slit and shows linear scaling time packets expand. We employ...
Abstract We propose in this White Paper a concept for space experiment using cold atoms to search ultra-light dark matter, and detect gravitational waves the frequency range between most sensitive ranges of LISA terrestrial LIGO/Virgo/KAGRA/INDIGO experiments. This interdisciplinary experiment, called Atomic Experiment Dark Matter Gravity Exploration (AEDGE), will also complement other planned searches exploit synergies with wave detectors. give examples extended sensitivity matter offered...
Albert Einstein's insight that it is impossible to distinguish a local experiment in "freely falling elevator" from one free space led the development of theory general relativity. The wave nature matter manifests itself striking way Bose-Einstein condensates, where millions atoms lose their identity and can be described by single macroscopic function. We combine these two topics report preparation observation condensate during fall 146-meter-tall evacuated drop tower. During expansion over...
The theory of general relativity describes macroscopic phenomena driven by the influence gravity while quantum mechanics brilliantly accounts for microscopic effects.Despite their tremendous individual success, a complete unification fundamental interactions is missing and remains one most challenging important quests in modern theoretical physics.The STE-QUEST satellite mission, proposed as medium-size mission within Cosmic Vision program European Space Agency (ESA), aims testing with high...
Interferometers based on ultracold atoms enable an absolute measurement of inertial forces with unprecedented precision. However, their resolution is fundamentally restricted by quantum fluctuations. Improved resolutions entangled or squeezed were demonstrated in internal-state measurements for thermal and quantum-degenerate and, recently, momentum-state interferometers laser-cooled atoms. Here, we present a gravimeter Bose-Einstein condensates sensitivity <a:math...
We have developed a novel interferometer for atom de Broglie waves, where amplitude division and recombination is achieved by diffraction at standing light waves operating as phase gratings. Our new the exact mirror image of interferometers light, with roles atoms photons interchanged, it directly demonstrates coherence atomic waves. Easy manipulation phase, intensity, polarization wave permits studies properties.
We have observed a Bose-Einstein condensate in dilute gas of 4He the (3)2S(1) metastable state. find critical temperature (4.7+/-0.5) microK and typical number atoms at threshold 8 x 10(6). The maximum our is about 5 10(5). An approximate value for scattering length = (16+/-8) nm measured. mean elastic collision rate then estimated to be 2 10(4) s(-1), indicating that we are deeply hydrodynamic regime. decay time s, which places an upper bound on constants two-body three-body inelastic collisions.
Do the laws of quantum physics still hold for macroscopic objects - this is at heart Schrödinger's cat paradox or do gravitation yet unknown effects set a limit massive particles? What fundamental relation between and gravity? Ground-based experiments addressing these questions may soon face limitations due to limited free-fall times quality vacuum microgravity. The proposed mission Macroscopic Quantum Resonators (MAQRO) overcome allow such questions. MAQRO harnesses recent developments in...
In contrast to light, matter-wave optics of quantum gases deals with interactions even in free space and for ensembles comprising millions atoms. We exploit these a degenerate gas as an adjustable lens coherent atom optics. By combining interaction-driven quadrupole-mode excitation Bose-Einstein condensate (BEC) magnetic lens, we form time-domain system. The focus is tuned by the strength lensing potential oscillatory phase quadrupole mode. placing at infinity, lower total internal kinetic...
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 study a space-based gravity gradiometer based on cold atom interferometry and its potential for the Earth's gravitational field mapping. The instrument architecture has been proposed in [Carraz et al., Microgravity Science Technology 26, 139 (2014)] enables high-sensitivity measurements of gradients by using interferometers differential accelerometer configuration. present design including subsystems analyze mission scenario, which we derive expected performances, requirements sensor key...
Ultracold quantum gases are ideal sources for high-precision space-borne sensing as proposed Earth observation, relativistic geodesy and tests of fundamental physical laws well studying new phenomena in many-body physics during extended free fall. Here we report on experiments with the Cold Atom Lab aboard International Space Station, where have achieved exquisite control over state single 87Rb Bose-Einstein condensates paving way future measurements. In particular, applied fast transport...
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...
Deployment of ultracold atom interferometers (AI) into space will capitalize on quantum advantages and the extended freefall persistent microgravity to provide high-precision measurement capabilities for gravitational, Earth, planetary sciences, enable searches subtle forces signifying physics beyond General Relativity Standard Model. NASA's Cold Atom Lab (CAL) operates onboard International Space Station as a multi-user facility fundamental studies atoms mature space-based technologies. We...
Ultracold atoms at temperatures close to the recoil limit have been achieved by extending Doppler cooling forbidden transitions. A cloud of ^40Ca has cooled and trapped a temperature as low 6 \mu K operating magneto-optical trap on spin-forbidden intercombination transition. Quenching long-lived excited state with an additional laser enhanced scattering rate factor 15, while high selectivity in velocity was preserved. With this method more than 10% pre-cooled from standard transferred...
Quantum sensors based on coherent matter-waves are precise measurement devices whose ultimate accuracy is achieved with Bose–Einstein condensates (BECs) in extended free fall. This ideally realized microgravity environments such as drop towers, ballistic rockets and space platforms. However, the transition from lab-based BEC machines to robust mobile sources comparable performance a challenging endeavor. Here we report realization of miniaturized setup, generating flux quantum degenerate...
The use of retro-reflection in light-pulse atom interferometry under microgravity conditions naturally leads to a double-diffraction scheme. two pairs counterpropagating beams induce simultaneously transitions with opposite momentum transfer that, when acting on atoms initially at rest, give rise symmetric interferometer configurations where the total is automatically doubled and number noise sources systematic effects cancel out. Here we extend earlier implementations for Raman case Bragg...
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...