A5023121111- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Quantum Information and Cryptography
- Advanced Frequency and Time Standards
- Quantum Mechanics and Applications
- Orbital Angular Momentum in Optics
- Quantum, superfluid, helium dynamics
- Laser-Matter Interactions and Applications
- Advanced Chemical Physics Studies
- Strong Light-Matter Interactions
- Quantum chaos and dynamical systems
- Atomic and Molecular Physics
- Nonlinear Photonic Systems
- Advanced MRI Techniques and Applications
- Advanced Fiber Laser Technologies
- Quantum Mechanics and Non-Hermitian Physics
- Mechanical and Optical Resonators
- Ocean Waves and Remote Sensing
- Spectroscopy and Quantum Chemical Studies
- Nonlinear Dynamics and Pattern Formation
- EEG and Brain-Computer Interfaces
- Minerals Flotation and Separation Techniques
- VLSI and FPGA Design Techniques
- Radioactive Decay and Measurement Techniques
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2021-2025
Center for Integrated Quantum Science and Technology
2013-2025
Quantum Technologies (Sweden)
2025
Universität Ulm
2009-2022
Moscow Power Engineering Institute
2022
Prokhorov General Physics Institute
2000-2018
Sorbonne Paris Cité
2016
Université Paris Cité
2016
Université Sorbonne Paris Nord
2016
Laboratoire de physique des lasers
2016
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...
Abstract Progress in understanding quantum systems has been driven by the exploration of geometry, topology, and dimensionality ultracold atomic systems. The NASA Cold Atom Laboratory (CAL) aboard International Space Station enabled study bubbles, a terrestrially-inaccessible topology. Proof-of-principle bubble experiments have performed on CAL with an radiofrequency-dressing technique; alternate technique (dual-species interaction-driven bubbles) also proposed. Both techniques can drive...
We present a unique matter-wave interferometer whose phase scales with the cube of time atom spends in interferometer. Our scheme is based on full-loop Stern-Gerlach incorporating four magnetic field gradient pulses to create state-dependent force. In contrast typical interferometers that make use laser light for splitting and recombination wave packets, this realization uses no can therefore serve as high-precision surface probe at very close distances.
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...
Abstract In 1974, Stephen Hawking predicted that quantum effects in the proximity of a black hole lead to emission particles and evaporation. At very heart this process lies logarithmic phase singularity which leads Bose-Einstein statistics radiation. An identical appears elementary system inverted harmonic oscillator. Letter we report observation onset emerging at horizon space giving rise Fermi-Dirac distribution. For purpose, utilize surface gravity water waves freely propagate an...
The narrowing of electron and ion wave packets in the process photoionization is investigated, with electron-ion recoil taken fully into account. Packet localization this type directly related to entanglement joint quantum state ion, Einstein-Podolsky-Rosen localization. Experimental observation such packet-narrowing effects suggested via coincidence registration by two detectors, a fixed position one varying other. A similar effect, typically an enhanced degree entanglement, shown occur...
We show both theoretically and experimentally that biphoton wave packets generated via spontaneous parametric down-conversion can be strongly anisotropic highly entangled. The conditions under which these effects exist are found discussed.
Ultracold quantum gases confined in three-dimensional bubble traps are promising tools for exploring many-body effects on curved manifolds. As an alternative to the conventional technique of radio-frequency dressing, we propose create such shell-shaped Bose-Einstein condensates microgravity based dual-species atomic mixtures and analyze their properties as well feasibility realize symmetrically filled shells. Beyond similarities with dressing method collective-excitation spectrum, our...
We show the existence of Borromean bound states in a one-dimensional quantum three-body system composed two identical bosons and distinguishable particle. It is assumed that there no interaction between bosons, while mass-imbalanced two-body subsystems can be tuned to either or unbound. Within framework Faddeev equations, spectrum corresponding wave functions are computed numerically. In addition, we identify parameter-space region for interaction, where occur, evaluate their geometric...
Einstein's general theory of relativity is based on the principle equivalence - in essence, dating back to Galileo which asserts that, locally, effect a gravitational field equivalent that an accelerating reference frame, so local eliminated freely falling frame. enables this extend global description relativistic space-time, at expense allowing space-time become curved, realising consistent frame-independent nature classical level. has been confirmed great accuracy for astrophysical bodies....
We show that a discontinuity either in wave function or its derivative, corresponding to jump kink, causes ripples Wigner phase space. In the free time evolution, these structures give rise interference fringes probability density represented spacetime.
We show that the wave packet of a biphoton generated via spontaneous parametric down-conversion is strongly anisotropic. Its anisotropic features manifest themselves very clearly in comparison with measurements performed two different schemes: When detector scanning plane perpendicular or parallel to containing crystal optical axis and laser axis. The first these schemes traditional whereas second one gives rise such unexpected results, as anomalously strong narrowing measured coincidence...
Spontaneous emission of a photon by an atom is described theoretically in three dimensions with the initial wave function finite-mass taken form finite-size packet. Recoil and wave-packet spreading are into account. The total atom-photon found momentum coordinate representations as solution initial-value problem. entanglement arising such process shown to be closely related structure packets which can measured coincidence single-particle schemes measurements. Two predicted effects, under...
Strong and/or short laser pulses provide one avenue for rapid separation of composite quantum systems. Daughter particles can exhibit subtle aspects entanglement. We show that a Gaussian approximation provides unifying overview rapidly separating systems in many contexts, and propose using combined single-particle coincidence measurements wave-packet widths bipartite experimental observation the degree
We consider the scattering of an atom by a sequence two near-resonant standing light waves, each formed running waves with slightly different wave vectors. Due to opposite detunings within rotating approximation, adiabatic approximation applied atomic center-of-mass motion, and smooth turning on off interaction, dynamical phase cancels out final state differs from initial one only sum Berry phases accumulated in interaction regions. This depends position way such that packet emerging region...
We theoretically study and successfully observe the evolution of Gaussian Airy surface gravity water wave packets propagating in an effective linear potential. This potential results from a homogeneous time-dependent flow created by computer-controlled pump. For both we measure amplitudes cubic phases appearing due to Furthermore, demonstrate that self-acceleration can be completely canceled
We propose and experimentally demonstrate a method to prepare nonspreading atomic wave packet. Our technique relies on spatially modulated absorption constantly chiseling away from an initially broad de Broglie wave. The resulting contraction is balanced by dispersion due Heisenberg's uncertainty principle. This quantum evolution results in the formation of packet Gaussian form with quadratic phase. Experimentally, we confirm these predictions observing momentum distribution. Moreover,...
We analyze the spin dynamics of an out-of-equilibrium large dipolar atomic Bose gas in optical lattice. observe a smooth crossover from complex oscillatory behavior to exponential throughout Mott-to-superfluid transition. While both these regimes are well described by our theoretical models, we provide data intermediate regime where interactions, contact and superexchange mechanisms compete. In this strongly correlated regime, transport coupled, which challenges models for quantum magnetism.
We show that the expectation value of operator defined by position and momentum operators with a positive parameter c can serve as tool to identify quantum non-Gaussian states, is states cannot be represented mixture Gaussian states. Our condition readily tested employing highly efficient homodyne detection which unlike quantum-state tomography requires measurements only two orthogonal quadratures. demonstrate our method even able detect positive–definite Wigner functions. This situation...
We show that in order to guide waves, it is sufficient periodically truncate their edges. The modes supported by this type of wave propagate freely between the slits, and propagation pattern repeats itself. experimentally demonstrate general phenomenon for two types waves: (i) plasmonic waves propagating on a metal-air interface are blocked nanometric metallic walls, (ii) surface gravity water whose evolution recorded, packet truncated, generated again repeated patterns. This guiding concept...
Abstract We investigate bright and dark diffractive focusing emerging in the free propagation of specific wave profiles. These general phenomena manifest themselves matter, water, classical waves. In this article, we lay foundations for these effects illustrate their origin Wigner phase space. Our theoretical studies are supported by experimental demonstrations water Moreover, using different slits analyze several aspects matter
Motivated by the recent experimental realization of ultracold quantum gases in shell topology, we propose a straightforward implementation matter-wave lensing techniques for shell-shaped Bose-Einstein condensates. This approach allows to significantly extend observation time condensate during its free expansion and enables study novel many-body effects on curved geometries. With both analytical numerical methods derive optimal parameters realistic schemes conserve shape times up hundreds...
We study a heavy-heavy-light three-body system confined to one space dimension. Both binding energies and corresponding wave functions are obtained for (i) the zero-range, (ii) two finite-range attractive heavy-light interaction potentials. In case of zero-range potential, we apply method Skorniakov Ter-Martirosian explore accuracy Born-Oppenheimer approach. For potentials, solve Schr\"odinger equation numerically using pseudospectral method. demonstrate that when two-body ground state...
Abstract In this article we present a new representation-free formalism, which can significantly simplify the analysis of interferometers comprised atoms moving in time-dependent linear potentials. We methodology for construction two pairs functions that, once determined, lead to conditions closing interferometer, and determine phase contrast resultant interference. Using explore dependency interferometer on time T different atom interferometers. By now, it is well established that light...