A5089645551- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Advanced Fiber Laser Technologies
- Quantum, superfluid, helium dynamics
- Quantum Information and Cryptography
- Spectroscopy and Laser Applications
- Semiconductor Lasers and Optical Devices
- Physics of Superconductivity and Magnetism
- Quantum Mechanics and Applications
- Mechanical and Optical Resonators
- Quantum many-body systems
- Magneto-Optical Properties and Applications
- Atmospheric Ozone and Climate
- Complex Systems and Time Series Analysis
- Radioactive Decay and Measurement Techniques
- Theoretical and Computational Physics
- Gas Dynamics and Kinetic Theory
- Optical Network Technologies
- Topological Materials and Phenomena
- Geophysics and Sensor Technology
- Laser Design and Applications
- Infrared Target Detection Methodologies
- Financial Markets and Investment Strategies
Johannes Gutenberg University Mainz
2015-2024
University of Applied Sciences Mainz
2019-2020
Universität Hamburg
2010-2015
Danish National Research Foundation
2009
University of Copenhagen
2008-2009
National Research Foundation
2008
Max Planck Society
2007
Max Planck Institute of Quantum Optics
2007
Technical University of Munich
2001
Magnetism plays a key role in modern technology as essential building block of many devices used daily life. Rich future prospects connected to spintronics, next generation storage or superconductivity make it highly dynamical field research. Despite those ongoing efforts, the many-body dynamics complex magnetism is far from being well understood on fundamental level. Especially study geometrically frustrated configurations challenging both theoretically and experimentally. Here we present...
We present a universal method to create tunable, artificial vector gauge potential for neutral particles trapped in an optical lattice. The necessary Peierls phase of the hopping parameters between neighboring lattice sites is generated by applying suitable periodic inertial force such that does not rely on any internal structure particles. experimentally demonstrate realization potentials, which generate ground state superfluids at arbitrary non-zero quasi-momentum. furthermore investigate...
Squeezing of quantum fluctuations by means entanglement is a well-recognized goal in the field information science and precision measurements. In particular, squeezing via between 2-level atoms can improve sensing, clocks, metrology, spectroscopy. Here, we demonstrate 3.4 dB metrologically relevant for ≳ 10 5 cold caesium nondemolition (QND) measurement on atom clock levels. We show that there an optimal degree decoherence induced which maximizes generated entanglement. A 2-color QND scheme...
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...
Time-periodic driving like lattice shaking offers a low-demanding method to generate artificial gauge fields in optical lattices. We identify the relevant symmetries that have be broken by function for purpose and demonstrate power of this making concrete proposals its application two-dimensional systems: show how tune frustration create control band touching points Dirac cones shaken kagome lattice. propose realization topological quantum spin Hall insulator spin-dependent hexagonal...
Precision time references in space are of major importance to satellite-based fundamental science, global satellite navigation, earth observation, and formation flying.Here we report on the operation a compact, rugged, automated optical frequency comb setup sounding rocket under microgravity.The experiment compared two clocks, one based D 2 transition Rb, another hyperfine splitting Cs.This represents first clock space, which is an important milestone for future precision metrology.Based...
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...
Optical lattices have developed into a widely used and highly recognized tool to study many-body quantum physics with special relevance for solid state type systems. One of the most prominent reasons this success is high degree tunability in experimental setups. While at beginning quasi-static, cubic geometries were mainly explored, focus field has now shifted toward new lattice topologies dynamical control structures. In review we intend give an overview progress recently achieved on side....
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...
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...
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...
We report on the first experimental setup based a 2D-/3D-magneto-optical trap (MOT) scheme to create both Bose-Einstein condensates and degenerate Fermi gases of several ytterbium isotopes. Our does not require Zeeman slower offers flexibility simultaneously produce ultracold samples other atomic species. Furthermore, extraordinary optical access favors future experiments in lattices. A 2D-MOT strong 1S0 → 1P1 transition captures directly from dispenser atoms loads 3D-MOT narrow 3P1...
We have developed, assembled, and flight-proven a stable, compact, autonomous extended cavity diode laser (ECDL) system designed for atomic physics experiments in space. To that end, two micro-integrated ECDLs at 766.7 nm were frequency stabilized during sounding rocket flight by means of modulation spectroscopy (FMS) 39^K offset locking techniques based on the beat note ECDLs. The stabilization as well additional hard- software to test hot redundancy mechanisms implemented part...
We report on the nondestructive observation of Rabi oscillations Cs clock transition. The internal atomic state evolution a dipole-trapped ensemble cold atoms is inferred from phase shift probe laser beam as measured using Mach-Zehnder interferometer. describe single color well two-color probing scheme. Using latter, measurements collective pseudospin projection in superposition states are performed and observed spin fluctuations shown to be close standard quantum limit.
We demonstrate the first guiding of cold atoms through a 88 mm long piece photonic band gap fiber. The potential is created by far-off resonance dipole trap propagating inside fiber with hollow core 12 mu m. load from dark spot 85-Rb magneto optical and observe peak flux more than 10^5 atoms/s at velocity 1.5 m/s. With an additional reservoir trap, constant atomic 10^4 sustained for 150\,ms. These results open up interesting possibilities to study nonlinear light-matter interaction in nearly...
Operating ultracold quantum gas experiments outside of a laboratory environment has so far been challenging goal, largely due to the lack sufficiently stable optical systems. In order increase thermal stability free-space laser systems, application nonstandard materials such as glass ceramics is required. Here, we report on Zerodur-based systems which include single-mode fiber couplers consisting multiple components jointed by light-curing adhesives. The thoroughly investigated, revealing...
We report on a versatile, highly controllable hybrid cold Rydberg atom fiber interface, based laser cooled atoms transported into hollow core Kagom\'{e} crystal fiber. Our experiments are the first to demonstrate feasibility of exciting inside and we study influence electromagnetically induced transparency (EIT) signals. Using temporally resolved detection method distinguish between excitation loss, observe two different regimes excitations: one EIT regime dominated by loss. These results...
This paper presents the current status and future prospects of Space Atom Interferometer project (SAI), funded by European Agency. interferometry provides extremely sensitive accurate tools for measurement inertial forces. Operation atom interferometers in microgravity is expected to enhance performance such sensors. Main goal SAI demonstrate possibility placing space. The resulting drop-tower compatible acceleration sensor prototype described. Expected limits potential scientific...
Abstract We report on the design and construction of a sounding rocket payload capable performing atom interferometry with Bose-Einstein condensates $$^{41}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow/><mml:mn>41</mml:mn></mml:msup></mml:math> K $$^{87}$$ xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow/><mml:mn>87</mml:mn></mml:msup></mml:math> Rb. The apparatus is designed to be launched in two consecutive missions VSB-30 qualified...