Article
Physics, Multidisciplinary
M. Weyland, S. S. Szigeti, R. A. B. Hobbs, P. Ruksasakchai, L. Sanchez, M. F. Andersen
Summary: This study investigates the photoassociation dynamics of exactly two laser-cooled Rb-85 atoms in an optical tweezer and reveals fundamentally different behavior compared to photoassociation in many-atom ensembles. The nonexponential decay observed in the two-atom experiment cannot be described by a single rate coefficient and is attributed to the system's pair correlation. By probing the transition from two-atom dynamics to many-atom dynamics in a three-atom system, the experiments reveal additional reaction dynamics accessible through the control of single atoms and suggest the measurement of pair correlations in few-atom systems through photoassociation.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Jackson Yant, Miles Blencowe
Summary: Recent work suggests the possibility of detecting gravitationally induced entanglement in tabletop experiments. However, there is a lack of developed models for this type of experiment where entangled particles are treated as excitations of a relativistic quantum field and measurements are modeled using expectation values of field observables. In this study, a thought experiment is proposed to investigate entanglement dynamics between two particles prepared in a superposition of coherent states within a 3D harmonic trap. The analysis provides insights into gravitationally induced entanglement and serves as a foundation for further investigation using quantum field theory.
Article
Optics
Dmitry Obydennov, Konstantin B. Yushkov, Vladimir Ya. Molchanov
Summary: We developed a tunable system for shaping the spectral and spatial frequency of ultrashort laser pulses using acousto-optic filters. This system allows for the creation of arbitrary axially symmetric multi-wavelength field configurations and enables high-speed control. Experimental results demonstrate the independent generation of different colored intensity distributions from a single laser beam using this system.
Article
Engineering, Mechanical
D. D. Tandel, Anindya Chatterjee, Atanu K. K. Mohanty
Summary: This paper studies the dynamics of a trapped ion in a mass spectrometer under the influence of quadrupolar RF and dipolar DC excitation. By calculating the electrostatic field for realistic geometries, we derive a classical Mathieu equation with a perturbation term and quadratic nonlinearity. We simplify the solution proposed by Plass, include the quadratic term, and develop a second-order averaging-based approximation. The results show that a stable periodic solution can be obtained using a two-frequency approximation, and we quantify the effect of the quadratic nonlinearity.
NONLINEAR DYNAMICS
(2023)
Article
Physics, Multidisciplinary
P. Ilzhoefer, M. Sohmen, G. Durastante, C. Politi, A. Trautmann, G. Natale, G. Morpurgo, T. Giamarchi, L. Chomaz, M. J. Mark, F. Ferlaino
Summary: The study investigates the response of dipolar supersolids to interaction quenches, finding a parameter regime where the out-of-equilibrium state rephases before gradually relaxing into an incoherent droplet array. Collective mode excitations caused by the interaction quench connect to phonons in solids and affect the phase dynamics.
Article
Optics
Dmitry Obydennov, Konstantin B. Yushkov, Vladimir Ya Molchanov
Summary: This study reports a novel optical scheme of an annular optical trap based on an acousto-optic tunable spatial filter. The design of the optical trap was proposed and validated, with experimental demonstrations showing controllable arrangements of floating particles into circular patterns, aggregation, and disaggregation. The dynamical adjustment of the trapping field potential diameter was achieved through programmable frequency-swept controlling of the acousto-optic filter.
Article
Optics
Hiroki Matsui, Yuki Miyazawa, Ryotaro Inoue, Mikio Kozuma
Summary: By directly loading atoms from the magneto-optical trap and using a rate-equation-based model combined with repumpers, we identified that blackbody radiation at room temperature drives E1 transitions and induces the observed losses in the metastable europium atoms trapped magnetically.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Zhenlian Shi, Ziliang Li, Pengjun Wa, Khan Sadio Nawaz, Liangchao Chen, Zengming Meng, Lianghui Huang, And Jing Zhang
Summary: In this study, Bose-Einstein condensates of sodium atoms in the |F = 2; m(F) = 2> hyperfine state were successfully produced using a D-2 gray molasses in a crossed optical dipole trap. The cooling process and three-body loss rates in different hyperfine states were compared through evaporation cooling in the optical trap and lifetime measurements.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Review
Physics, Multidisciplinary
Lauriane Chomaz, Igor Ferrier-Barbut, Francesca Ferlaino, Bruno Laburthe-Tolra, Benjamin L. Lev, Tilman Pfau
Summary: Since the achievement of quantum degeneracy in gases of chromium atoms in 2004, the experimental investigation of ultracold gases made of highly magnetic atoms has blossomed, yielding the observation of unprecedented phenomena. This review aims to present the unique aspects of the magnetic quantum-gas platform for exploring ultracold and quantum physics and give an overview of experimental achievements.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Physics, Multidisciplinary
Andreas Ask, Goran Johansson
Summary: The paper investigates the steady state behavior of an open quantum system in a non-Markovian environment. By studying a driven two-level system in a semi-infinite waveguide, it is found that non-Markovian states exhibit exotic behaviors such as population inversion and steady-state coherence beyond what is possible in the Markovian regime.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Jongmin Lee, Grant Biedermann, John Mudrick, Erica A. Douglas, Yuan-Yu Jau
Summary: This study demonstrates the generation of a cold-atom ensemble in a sub-millimeter diameter hole in a transparent membrane, achieving temperatures as low as 10 μK through sub-Doppler cooling. The membrane MOT device allows for efficient loading of cold atoms into an optical trap for strong atom-light interaction, representing a key step towards the development of a photonic atom trap integrated platform (ATIP).
SCIENTIFIC REPORTS
(2021)
Article
Optics
Zhangjin Chen, Shuqi Li, Huipeng Kang, Toru Morishita, Klaus Bartschat
Summary: Within the framework of the improved quantitative rescattering model, the correlated two-electron momentum distributions for nonsequential double ionization of Ar are simulated. The results show distinct anticorrelated back-to-back emission of the electrons along the major polarization direction, and the anticorrelation is more pronounced with increasing ellipticity. The study reveals the importance of the ionization potential of the excited parent ion and the laser intensity in the process.
Article
Optics
Y-D Chen, W-X Li, M-E Chou, C-H Kuo, C-S Li, S. Tung
Summary: A lithium-cesium slow beam is created using a two-dimensional magneto-optical trap, leading to high loading rates and maximum numbers of atoms in the trap. The results demonstrate that this method is suitable for producing an atomic beam of two species with a large mass ratio and very different volatilities.
Article
Optics
Denis B. Tretyakov, Vasily M. Entin, Ilya I. Beterov, Elena A. Yakshina, Yury Ya. Pechersky, Veniamin G. Gol'dort, Igor I. Ryabtsev
Summary: We present experimental results on the two-photon laser excitation of Rb atoms to Rydberg states, using a homemade 480 nm laser. The resonance line shapes were in good agreement with theory, and we also observed the Autler-Townes splitting of the EIT resonance.
Article
Physics, Multidisciplinary
A. Hammond, L. Lavoine, T. Bourdel
Summary: Researchers propose and demonstrate the existence of an effective attractive three-body interaction in coherently driven two-component Bose-Einstein condensates. This interaction originates from the spinor degree of freedom affected by a two-body mean-field shift of the driven transition frequency. The strength of this interaction can be controlled using the Rabi-coupling strength and does not result in additional losses. In the experiment, the three-body interactions are adjusted to play a predominant role in the equation of state of a cigar-shaped trapped condensate.
PHYSICAL REVIEW LETTERS
(2022)
Review
Physics, Multidisciplinary
Rafal Demkowicz-Dobrzanski, Wojciech Gorecki, Madalin Guta
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2020)
Article
Physics, Multidisciplinary
Martin-Isbjorn Trappe, Piotr T. Grochowski, Jun Hao Hue, Tomasz Karpiuk, Kazimierz Rzazewski
Summary: We predict the phase separations of two-dimensional Fermi gases with repulsive contact-type interactions between two spin components. The universal transition from the paramagnetic state at small repulsive interactions toward ferromagnetic density profiles at large interaction strengths is revealed, with intricate particle-number dependent phases in between. Our employed corrections to the bare contact interaction energy and especially to the Thomas-Fermi kinetic energy functional are necessary for reliably predicting properties of trapped mesoscopic Fermi gases.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Wojciech Gorecki, Rafal Demkowicz-Dobrzanski
Summary: We study quantum gains in a lossless multiple phase interferometry model and argue that the analysis solely based on quantum Fisher information is insufficient. Contrary to previous results, we demonstrate that the optimal simultaneous estimation scheme only provides a constant factor improvement compared to schemes where each phase is estimated separately.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Jakub Kopycinski, Maciej Lebek, Maciej Marciniak, Rafal Oldziejewski, Wojciech Gorecki, Krzysztof Pawlowski
Summary: The properties of a strongly interacting quantum many-body system are challenging to describe both theoretically and experimentally. In this study, we used a hydrodynamic approach to investigate the excitations of a one-dimensional repulsive Bose gas with arbitrary interaction strength. We found good agreement between our approach and exact solutions for particle excitations, but discrepancies for hole excitations. The hydrodynamical equations are useful for long-wave structures like phonons, but have limited applicability for short-wave structures like narrow solitons.
Article
Physics, Multidisciplinary
Wojciech Gorecki, Alberto Riccardi, Lorenzo Maccone
Summary: This study provides an optimal measurement strategy for a class of noisy channels that reduce to the identity channel for a specific parameter value. A physically relevant example of estimating displacement in the presence of phase randomizing noise is provided. Surprisingly, this noise does not affect the effectiveness of the optimal measurement. Squeezed vacuum probe field is the optimal strategy for small displacement, while homodyne detection becomes useless in the limit of small displacements.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Jakub Kopycinski, Maciej Lebek, Wojciech Gorecki, Krzysztof Pawlowski
Summary: We investigate dark solitons in a quasi-1D dipolar Bose gas and quantum droplets. An analytical solitonic solution of a Gross-Pitaevskii-like equation, accounting for beyond mean-field effects, is derived. The results show a critical value of dipolar interactions, causing the width of a motionless soliton to diverge. Peculiar solutions of motionless solitons with nonzero density minima are also found. Additionally, the energy spectrum of these solitons exhibits an additional excitation subbranch. Numerical experiments demonstrate the coexistence of a dark soliton inside a quantum droplet.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Ivan Morera, Rafal Oldziejewski, Grigori E. Astrakharchik, Bruno Julia-Diaz
Summary: We propose a mechanism for liquid formation in strongly correlated lattice systems by studying dipolar bosons in one-dimensional optical lattices as an example. We present a perturbative theory and validate it through simulations for the energetic and structural properties of the system's phases. We analyze the nonequilibrium properties and calculate the dynamic structure factor.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Ruipeng Li, Jonas von Milczewski, Atac Imamoglu, Rafal Oldziejewski, Richard Schmidt
Summary: We study induced pairing between two identical fermions mediated by an attractively interacting quantum impurity in two-dimensional systems. Based on a stochastic variational method (SVM), we investigate the influence of confinement and finite interaction range on the ground state of the quantum three-body problem. We find that confinement and a finite interaction range can enhance trimer stability and overcome Coulomb repulsion, opening possibilities for electron pairing beyond conventional paradigms.
Article
Materials Science, Multidisciplinary
Rafal Oldziejewski, Alessio Chiocchetta, Johannes Knoerzer, Richard Schmidt
Summary: Excitons in atomically thin transition-metal dichalcogenides confined to a one-dimensional geometry undergo a crossover from a Tonks-Girardeau to a charge density wave regime. Realistic system parameters are taken into account to predict the effective exciton-exciton interaction potential, showing key signatures of many-body crossover even at small exciton numbers. Photoluminescence spectra are found to provide accessible experimental fingerprints of strongly correlated quantum many-body states.
Article
Optics
Wojciech Gorecki, Rafal Demkowicz-Dobrzanski
Summary: This article discusses the application of the Heisenberg limit in multiparameter metrology within two different paradigms. It investigates the potential advantage of measuring all parameters simultaneously compared to estimating them individually, showing that the magnitude of this advantage and the conditions under which it occurs depend on the chosen paradigm.
Article
Optics
Andrzej Syrwid, Maciej Lebek, Piotr T. Grochowski, Kazimierz Rzazewski
Summary: This study analyzes the dynamics of a two-component ultracold Fermi gas under the influence of strong intercomponent contact repulsion and demonstrates its potential application in exciting spin-dipole modes through experimental verification.
Article
Optics
Maciej Lebek, Andrzej Syrwid, Piotr T. Grochowski, Kazimierz Rzazewski
Summary: We analyze the dynamics of one-dimensional quantum gases with strongly attractive contact interactions and find that attractive forces can effectively act as strongly repulsive ones. Our findings extend the theoretical results on the super-Tonks-Girardeau gas and have implications for the domain stability in a two-component Fermi gas. We also discuss the effects of finite-range interactions and analyze the universality of the presented results. Moreover, our conclusions support the existence of metastable quantum droplets in the regime of strongly attractive contact and attractive dipolar interactions.
Article
Physics, Multidisciplinary
Maciej Lebek, Piotr T. Grochowski, Kazimierz Rzazewski
Summary: This study investigates a strongly interacting many-body system of bosons using Gaudin solutions, revealing that a highly coherent design present in an ultracold bosonic gas trapped in a box potential gets destroyed by weak to moderate interatomic interactions, but is revived in a very strongly interacting regime. The analysis tracks the crossover from single- to many-body systems and examines de- and rephasing in the system.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Multidisciplinary
Michal Kowalski, Rafal Oldziejewski, Kazimierz Rzazewski
PHYSICAL REVIEW RESEARCH
(2020)
Article
Physics, Multidisciplinary
Weronika Golletz, Wojciech Gorecki, Rafal Oldziejewski, Krzysztof Pawlowski
PHYSICAL REVIEW RESEARCH
(2020)
