A5059605410- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Advanced Frequency and Time Standards
- Zeolite Catalysis and Synthesis
- Quantum Computing Algorithms and Architecture
- Advanced NMR Techniques and Applications
- Strong Light-Matter Interactions
- Fractal and DNA sequence analysis
- Spectroscopy and Laser Applications
- Pulsars and Gravitational Waves Research
- Spectroscopy and Quantum Chemical Studies
- High-pressure geophysics and materials
- Quantum and electron transport phenomena
- Advanced Condensed Matter Physics
- Quantum Mechanics and Applications
- Atomic and Molecular Physics
- Black Holes and Theoretical Physics
- Glass properties and applications
Jožef Stefan Institute
2017-2024
University of Ljubljana
2021-2024
A study of bright matter-wave solitons a cesium Bose-Einstein condensate (BEC) is presented. Production single soliton demonstrated and dependence atom number on the interatomic interaction investigated. Formation trains in quasi one-dimensional confinement shown. Additionally, fragmentation BEC has been observed outside confinement, free space. In end double production setup for studying collisions described.
We demonstrate the emission of correlated atom jets from a matter-wave soliton in quasi-one-dimensional optical trap. characterize dependence jet properties on frequency, amplitude, and length modulation, qualitatively reproduce trends mean-field picture with one-dimensional time-dependent Gross-Pitaevskii equation simulation. High-order are observed for sufficiently long pulses. A double-pulse modulation sequence produces consecutive jets, multipulse may lead to irregular three-dimensional...
We observe dark-state polariton collapses and revivals in a quantum memory based on electromagnetically induced transparency cloud of cold cesium atoms magnetic field. Using ${\ensuremath{\sigma}}^{+}$-polarized signal control beams the direction field, we suppress by polarizing towards one stretched Zeeman states optimizing frequency detuning beam. In this way, demonstrate with only partial collapses, making usable at any storage time, not discretized times revivals. obtain time more than...
We combine the Ramsey interferometry protocol, Stern-Gerlach detection scheme, and use of elongated geometry a cloud fully polarized cold cesium atoms to measure selected component magnetic-field gradient along atomic in single shot. In contrast standard method where precession two spatially separated clouds is simultaneously measured extract their phase difference, which proportional gradient, we here demonstrate gradiometer using image an expanding with difference imprinted cloud. Using...
Abstract Spin noise based quantum random number generators first appeared in 2008 and have since then garnered little further interest, part because their bit rate is limited by the transverse relaxation time $T_{2}$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>T</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:math> which for coated alkali vapour cells typically kbit/s range. Here we present two advances. The an improved generation protocol that allows...
We report a $^{23}$Na spin-lattice relaxation rate, $T_1^{-1}$, in low-silica X zeolite. $T_1^{-1}$ follows multiple BPP-type behavior as result of thermal motion sodium cations insulating material. The estimated lowest activation energy 15~meV is much lower than 100~meV observed previously for heavily Na-loaded samples and most likely attributed to short-distance jumps between sites within the same supercage.
We use optical tweezers based on time-multiplexed acousto-optic deflectors to trap ultracold cesium atoms in one-dimensional arrays of atomic ensembles. For temperatures between $2.5\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{K}$ and $50\phantom{\rule{0.16em}{0ex}}\mathrm{nK}$ we study the maximal time tweezer pulses that retains number a single trap. This provides an estimate sites array tweezers. demonstrate evaporative cooling up 25 traps preparation box potential. Additionally,...
The ground state of alkali metals when the particle size decreases from bulk to nanometric atomic clusters is inevitably accompanied by quantum effects that can suppress their pristine metallic state. We demonstrate nature rubidium confined and arrayed in framework insulating low-silica X zeolite preserved. $^{87}$Rb NMR spin-lattice relaxation assigned supercages shows a Korringa behavior 190~K down 10~K, which compatible with macroscopic observation low electrical resistivity. density...
We experimentally show the formation of incommensurable "golden" $\frac{1+\sqrt{5}}{2}$ matter-wave jets in a Bose-Einstein condensate (BEC) subjected to single frequency interaction modulation. study higher order and corresponding density waves quasi one dimensional (1D) geometry with help numerical 1D Gross-Pitaevskii equation simulation. explore process jet theoretically for large range modulation amplitudes frequencies present phase diagram formation. In simulation, amplitudes,...
We observe dark-state polariton collapses and revivals in a quantum memory based on electromagnetically induced transparency cloud of cold cesium atoms magnetic field. Using $\sigma^+$ polarized signal control beams the direction field, we suppress by polarizing towards one stretched Zeeman states optimizing frequency detuning beam. In this way, demonstrate with only partial collapses, making usable at any storage time, not discretized times revivals. obtain time more than 400 $\rm{\mu}$s,...
We use optical tweezers based on time-multiplexed acousto-optic deflectors to trap ultra-cold cesium atoms in one-dimensional arrays of atomic ensembles. For temperatures between 2.5 $μ$K and 50 nK we study the maximal time tweezer pulses that retains number a single trap. This provides an estimate sites array tweezers. demonstrate evaporative cooling up 25 traps preparation box potential. Additionally, three different protocols for atomic-ensemble by transfer from expanding cloud. These...