Article
Multidisciplinary Sciences
Mengjie Wei, Wouter Verstraelen, Konstantinos Orfanakis, Arvydas Ruseckas, Timothy C. H. Liew, Ifor D. W. Samuel, Graham A. Turnbull, Hamid Ohadi
Summary: The authors demonstrate the on-the-fly reconfigurable optical trapping of organic polariton condensates, which are delocalized over a macroscopic distance from the excitation region. This study holds great potential for future research on polaritonic lattice physics.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
S. Baryshev, A. Zasedatelev, H. Sigurdsson, I Gnusov, J. D. Topfer, A. Askitopoulos, P. G. Lagoudakis
Summary: In this study, we conducted full polarization tomography on photon correlations in a spinor exciton-polariton condensate. Our measurements demonstrate the different forms of condensate pseudospin mean-field dynamics and their intrinsic relation to the condensate photon statistics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Mathematics, Applied
Pavel A. Andreev
Summary: Traditional quantum hydrodynamics of BECs is limited by continuity equations and Euler equations. The quantum Bohm potential includes a nontrivial part that evolves under quantum fluctuations. In dipolar BECs, the long-range dipole-dipole interaction contributes to quantum fluctuations, leading to the existence of the second wave solution and introducing instability in BECs.
Article
Optics
A. D. Garcia-Orozco, L. Madeira, M. A. Moreno-Armijos, A. R. Fritsch, P. E. S. Tavares, P. C. M. Castilho, A. Cidrim, G. Roati, V. S. Bagnato
Summary: We studied the emergence of universal scaling in the time-evolving momentum distribution of a harmonically trapped three-dimensional Bose-Einstein condensate, which was parametrically driven to a turbulent state. We found that the out-of-equilibrium dynamics post excitation can be described by a single function due to nearby nonthermal fixed points. The observed behavior connects the dynamics of a quantum turbulent state to several far-from-equilibrium phenomena.
Article
Physics, Multidisciplinary
Hagai Edri, Boaz Raz, Gavriel Fleurov, Roee Ozeri, Nir Davidson
Summary: We studied the evolution of a Bose-Einstein condensate in a two-state superposition and successfully decoupled the system from strong magnetic noises. Our results show the impact of inter-state interactions on general superposition states and demonstrate squeezing of Gaussian noise using nonlinear spin dynamics. The scheme can be used for spin-squeezing beyond the standard quantum limit and observing polaron physics.
NEW JOURNAL OF PHYSICS
(2021)
Article
Mathematics, Interdisciplinary Applications
Mikhail N. Smolyakov
Summary: In this paper, quantization of a weakly nonideal Bose gas at zero temperature is performed along the lines of the well-known Bogolyubov approach. By introducing nonoscillation modes and calculating nonlinear corrections, the analysis successfully recovers canonical commutation relations and solves the issue of nonconserved particle number at least in the case of free quasi-particles.
CHAOS SOLITONS & FRACTALS
(2021)
Article
Physics, Multidisciplinary
Timon A. Hilker, Lena H. Dogra, Christoph Eigen, Robert P. Smith, Zoran Hadzibabic
Summary: The two sounds in a highly compressible fluid are investigated using an ultracold Bose gas. The results show that only one sound persists at different temperatures, which is consistent with the hydrodynamic theory.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
M. B. Christensen, T. Vibel, A. J. Hilliard, M. B. Kruk, K. Pawlowski, D. Hryniuk, K. Rzazewski, M. A. Kristensen, J. J. Arlt
Summary: Quantum systems exhibit inherent fluctuations in their physical observables, which presents challenges in studying interactions in quantum systems at finite temperature. This study characterizes atom number fluctuations in weakly interacting Bose-Einstein condensates, showing a reduction in fluctuations below canonical expectations. The experimental results set a benchmark for theoretical calculations under typical experimental conditions, revealing microcanonical nature of the system and a near linear scaling relationship between peak fluctuations and atom number.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
M. Miskeen Khan, H. Tercas, J. T. Mendonca, J. Wehr, C. Charalambous, M. Lewenstein, M. A. Garcia-March
Summary: The study investigates the quantum motion of an impurity atom in a Bose-Einstein condensate in arbitrary dimensions, showing superdiffusive behavior, dimension-dependent average energy, and non-Markovianity of particle motion. Trapped impurity atoms exhibit stronger position squeezing in lower dimensions.
Article
Multidisciplinary Sciences
Silvana Palacios Alvarez, Pau Gomez, Simon Coop, Roberto Zamora-Zamora, Chiara Mazzinghi, Morgan W. Mitchell
Summary: We present a magnetic sensor with extremely high energy resolution, applied in the detection of Rb-87 single-domain spinor Bose-Einstein condensates. By utilizing nondestructive Faraday rotation probing, we have achieved a low-frequency magnetic sensitivity of 72(8) fT, and measured the volume, spin coherence time, and readout noise of the condensate experimentally.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Optics
Michail Kritsotakis, Jacob A. Dunningham, Simon A. Haine
Summary: The study investigates the theoretical use of quantum nondemolition measurement to enhance the sensitivity of atom interferometry with Bose-condensed atoms. By finding the optimal parameter regime balancing spin squeezing and atomic loss, significant improvements in sensitivity are possible. Additionally, the use of squeezed light is considered to provide further boosts to sensitivity.
Article
Mathematics, Interdisciplinary Applications
R. Flores-Calderon, J. Fujioka, A. Espinosa-Ceron
Summary: This study investigates the soliton dynamics of a high-density Bose-Einstein condensate in a time-oscillating trap using a modified Gross-Pitaevskii equation, considering three-body losses, atomic feeding, and quantum fluctuations. The behavior of a Gaussian pulse in a static double-well potential is studied using a variational approximation, showing oscillatory behavior and fragmentation and regeneration phenomenon. Comparison between variational results and direct numerical solutions reveal good agreement when the pulse remains within one of the potential wells.
CHAOS SOLITONS & FRACTALS
(2021)
Article
Optics
Boyao Li, Xingjie Wang, Yaoyao Liang, Jinghua Sun, Sufang Zhu, Xiaoyong Chen, Guiyao Zhou
Summary: This study reports the generation of vectorial solitons in a single cavity induced by dual-core fiber assisted ultrafast fiber lasers. It was found that four-component polarized rotation vector solitons (PRVS) are generated using the dispersive Fourier transformation technique. Furthermore, by controlling the soliton phase offset in dual-core fiber, the soliton rain state of multi pulse evolution can be obtained.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Alessandro Fabbri, Roberto Balbinot
Summary: This study presents a simple model to describe the formation of an acoustic black hole in a Bose-Einstein condensate, allowing for analytical computation of the evolution of the corresponding density-density correlator over time. The emergence of analog Hawking radiation is observed from a quantum atmosphere region significantly displaced from the horizon, and is quantitatively studied at T = 0 and also in the presence of an initial temperature T as commonly found in experiments.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Ralf Wanzenboeck, Stefan Donsa, Harald Hofstaetter, Othmar Koch, Peter Schlagheck, Iva Brezinova
Summary: The study investigates the chaos phenomenon in the mean-field limit of a bosonic quantum many-body system, demonstrating that the system rapidly loses coherence with a rate determined by the Lyapunov exponent, which in turn affects the visibility of interference fringes.
Article
Physics, Multidisciplinary
A. Hueper, C. Puer, M. Hetzel, J. Geng, J. Peise, I Kruse, M. Kristensen, W. Ertmer, J. Arlt, C. Klempt
Summary: The article discusses an accurate technique for determining the number of atoms in entangled atomic ensembles, which is essential for interferometry beyond the standard quantum limit. The fluorescence detection method presented allows for single-atom accuracy measurements, with extrapolated accuracy for up to 390 atoms. This accurate atom number detection is utilized for stabilizing laser-cooled atomic ensembles and achieving high preparation fidelity and low number fluctuations below shot noise level in a target ensemble of 7 atoms.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
M. B. Christensen, T. Vibel, A. J. Hilliard, M. B. Kruk, K. Pawlowski, D. Hryniuk, K. Rzazewski, M. A. Kristensen, J. J. Arlt
Summary: Quantum systems exhibit inherent fluctuations in their physical observables, which presents challenges in studying interactions in quantum systems at finite temperature. This study characterizes atom number fluctuations in weakly interacting Bose-Einstein condensates, showing a reduction in fluctuations below canonical expectations. The experimental results set a benchmark for theoretical calculations under typical experimental conditions, revealing microcanonical nature of the system and a near linear scaling relationship between peak fluctuations and atom number.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Polina Feldmann, Carsten Klempt, Augusto Smerzi, Luis Santos, Manuel Gessner
Summary: Excited-state quantum phase transitions extend the concept of quantum phase transitions beyond the ground state, characterized by closing energy gaps in the spectrum. Identifying order parameters for excited-state quantum phase transitions is a challenge, but introducing a topological order parameter distinguishes excited state phases in experiments with spinor Bose-Einstein condensates, providing a way to experimentally characterize excited-state quantum phases in atomic many-body systems.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
F. Anders, A. Idel, P. Feldmann, D. Bondarenko, S. Loriani, K. Lange, J. Peise, M. Gersemann, B. Meyer-Hoppe, S. Abend, N. Gaaloul, C. Schubert, D. Schlippert, L. Santos, E. Rasel, C. Klempt
Summary: By transferring entanglement from the spin degree of freedom to well-separated momentum modes, we demonstrated a source of entangled atoms compatible with state-of-the-art interferometers, with a squeezing parameter of -3.1(8) dB. Entanglement-enhanced atom interferometers promise unprecedented sensitivities for quantum gradiometers or gravitational wave detectors.
PHYSICAL REVIEW LETTERS
(2021)
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
Quantum Science & Technology
Giuseppe Vitagliano, Matteo Fadel, Iagoba Apellaniz, Matthias Kleinmann, Bernd Lucke, Carsten Klempt, Geza Toth
Summary: This article presents a method to detect bipartite entanglement using number-phase-like uncertainty relations in split spin ensembles. An uncertainty relation is derived for spin systems, which allows for the detection of bipartite entanglement in an unpolarized Dicke state of many spin1/2 particles. The method involves splitting the particles into two subensembles and conducting collective angular momentum measurements locally on each part.
Article
Psychology, Experimental
Mads Kock Pedersen, Carlos Mauricio Castano Diaz, Qian Janice Wang, Mario Alejandro Alba-Marrugo, Ali Amidi, Rajiv V. Basaiawmoit, Carsten Bergenholtz, Morten H. Christiansen, Miroslav Gajdacz, Ralph Hertwig, Byurakn Ishkhanyan, Kim Klyver, Nicolai Ladegaard, Kim Mathiasen, Christine Parsons, Janet Rafner, Anders R. Villadsen, Mikkel Wallentin, Blanka Zana, Jacob F. Sherson
Summary: Rapid individual cognitive phenotyping has the potential to revolutionize personalized learning, employment practices, and precision psychiatry. A game-based tool called Skill Lab was developed to assess cognitive abilities while providing an engaging narrative. Using a citizen science platform, a comprehensive validation was conducted, and reliable models were constructed to predict eight cognitive abilities based on in-game behavior. The results demonstrate the feasibility of rapid in-the-wild assessment of cognitive abilities and its potential for population-scale benchmarking and individualized mental health diagnostics.
Article
Psychology, Educational
Janet Rafner, Qian Janice Wang, Miroslav Gadjacz, Thomas Badts, Brendan Baker, Carsten Bergenholtz, Michael Mose Biskjaer, Thomas Bui, Andrea Carugati, Matthieu de Cibeins, Lior Noy, Seyedahmad Rahimi, Kristian Tylen, Blanka Zana, Roger E. Beaty, Jacob Sherson
Summary: The article discusses the challenges in measuring divergent and convergent thinking in creativity assessments and proposes battery-based approaches. It introduces CREA, a new game-based assessment suite that offers increased scalability and improved ecological validity. The study demonstrates the validity of CREA in assessing divergent and convergent thinking, making it a valuable tool for researchers and educators.
CREATIVITY RESEARCH JOURNAL
(2023)
Article
Physics, Multidisciplinary
Jakub Kopycinski, Luca Parisi, Nick G. Parker, Krzysztof Pawlowski
Summary: We propose and benchmark a Gross-Pitaevskii-like equation for two-component Bose mixtures with competing interactions in 1D. Our approach follows the density functional theory with the energy functional based on the exact quantum Monte Carlo (QMC) simulations. We first benchmark our approach against available QMC data and then study dynamical properties that cannot be observed through ab initio many-body simulations, including the presence of anomalous dark solitons.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Optics
Cebrail Puer, Mareike Hetzel, Martin Quensen, Andreas Hueper, Jiao Geng, Jens Kruse, Wolfgang Ertmer, Carsten Klempt
Summary: In this paper, a high-flux source of 87Rb Bose-Einstein condensates combined with a number-resolving detection is presented for state tomography and interferometric application of entangled quantum states. A hybrid evaporation approach in a magnetic and optical trap is used to create Bose-Einstein condensates of 2 x 105 atoms with minimal thermal fraction within 3.3 s. The low-noise selection and subsequent detection of subsamples of up to 16 atoms are demonstrated, with counting noise below 0.2 atoms. These techniques offer an exciting path towards creating and analyzing mesoscopic quantum states with improved fidelities and their applications in fundamental and metrological fields.
Article
Physics, Multidisciplinary
Magnus G. Skou, Kristian K. Nielsen, Thomas G. Skov, Andreas M. Morgen, Nils B. Jorgensen, Arturo Camacho-Guardian, Thomas Pohl, Georg M. Bruun, Jan J. Arlt
Summary: Spectroscopic and interferometric measurements are essential for extracting the fundamental properties of quantum many-body systems. Interferometry can elucidate the dynamical evolution of the system, while spectroscopy provides precise measurements of equilibrated energies. The comparison of interferometric and spectroscopic timescales in the study of the Bose polaron reveals important insights into the quasiparticle physics.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Jesper Hasseriis Mohr Jensen, Miroslav Gajdacz, Shaeema Zaman Ahmed, Jakub Herman Czarkowski, Carrie Weidner, Janet Rafner, Jens Jakob Sorensen, Klaus Molmer, Jacob Friis Sherson
Summary: The study found that citizen science methodologies can be applied to solving complex numerical challenges, with player seeds showing better performance in sparse sampling scenarios. This highlights the potential for crowdsourcing the solution of future quantum research problems.
PHYSICAL REVIEW RESEARCH
(2021)
