Article
Physics, Multidisciplinary
Karol Gietka, Farokh Mivehvar, Thomas Busch
Summary: A novel composite light-matter magnetometer is proposed, using a multi-component Bose-Einstein condensate coupled to two distinct electromagnetic modes of a linear cavity for magnetic field measurement. The sensitivity of this magnetometer exhibits Heisenberg-like scaling with respect to the atom number, with a calculated lower bound for sensitivity at the order of fT (root Hz(-1))(-1) -pT (root Hz)(-1) for a condensate of 10(4) atoms with coherence times on the order of several ms under state-of-the-art experimental parameters.
NEW JOURNAL OF PHYSICS
(2021)
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
Engineering, Mechanical
Kashif Ammar Yasir, Yu Chengyong, Gao Xianlong
Summary: In this study, we investigate the steady-state multi-stability of a cavity system containing spin-orbit coupled Bose-Einstein condensate. We show that the cavity photon number and atomic population exhibit multi-stable behavior, which can be tuned with system parameters. Additionally, we find the occurrence of population transitional phase for the atomic states, which can be controlled by spin-orbit coupling and Zeeman field effects.
NONLINEAR DYNAMICS
(2023)
Article
Quantum Science & Technology
N. Dupont, G. Chatelain, L. Gabardos, M. Arnal, J. Billy, B. Peaudecerf, D. Sugny, D. Guery-Odelin
Summary: This study presents an efficient design of quantum optimal-control protocols for manipulating the motional states of atomic Bose-Einstein condensate in a one-dimensional optical lattice. By varying the lattice position, a wide variety of targets can be reached, including single or multiple quantized momentum states with full control on the relative phase between different momentum components.
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
Materials Science, Multidisciplinary
Jingjing Jin, Wei Han, Huifang Zhao, Wenyuan Liu
Summary: This study investigates the Moire superlattice structures generated by the interplay between vortex lattice and optical lattice in two-component Bose-Einstein condensates. The possible superlattice patterns under different twist angles are studied, as well as the relative shift of the Moire superlattices in two components of the condensates.
RESULTS IN PHYSICS
(2022)
Article
Optics
Yuhang Nie, Jun-Hui Zheng, Tao Yang
Summary: In this article, we investigate the Bogoliubov excitation spectrum of quantum droplets in an optical lattice and classify the collective excitations into different modes. The oscillation frequencies and phononic modes of the droplets are measured through experimental measurements. Furthermore, the instability caused by density fluctuations and the critical filling of atoms are discussed. This work is essential for understanding the superfluid nature of quantum droplets in an optical lattice.
Article
Optics
Stefan Ostermann, Helmut Ritsch, Farokh Mivehvar
Summary: In this study, we investigate the many-body phases of a two-dimensional Bose-Einstein condensate with cavity-mediated dynamic spin-orbit coupling. We identify three quantum phases with distinct atomic and photonic properties: the normal homogeneous phase, the superradiant spin-helix phase, and the superradiant supersolid spin-density-wave phase. The last phase exhibits an emergent crystal with a specific lattice structure in the atomic density distribution.
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
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
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
Li-Wei Liu, Chun-Guang Du, Guo-Heng Zhang, Qiong Chen, Yu-Qing Shi, Pei-Yu Wang, Yu-Qing Zhang
Summary: In this study, we theoretically investigated a second-order optomechanical-induced transparency process in a hybrid optomechanical system. The results show that the transmission intensity and amplitude can be controlled by manipulating the scattering frequency and other parameters.
Article
Physics, Fluids & Plasmas
L. G. F. Soares, F. Haas
Summary: An antiproton plasma confined in a quasi-1D device is described using a variational approach with self-consistent fluid formulation, while retaining thermal and Coulomb effects with the use of time-dependent variational method. Certain assumptions are made for number density and fluid velocity fields, simplifying the problem to ordinary nonlinear differential equations. Numerical simulations of the nonlinear dynamics for realistic parameters are performed, with adiabatic cooling and assumption of adiabatic equation of state for closure.
PHYSICS OF PLASMAS
(2021)
Article
Materials Science, Multidisciplinary
M. Pieczarka, O. Bleu, E. Estrecho, M. Wurdack, M. Steger, D. W. Snoke, K. West, L. N. Pfeiffer, A. G. Truscott, E. A. Ostrovskaya, J. Levinsen, M. M. Parish
Summary: The authors develop a generalized version of Bogoliubov theory for a driven-dissipative exciton-polariton condensate with a large incoherent uncondensed component. They argue that the presence of an excitonic reservoir modifies the energy and amplitudes of the Bogoliubov quasiparticle excitations. The authors support their theoretical findings with experimental results.
Article
Quantum Science & Technology
Rui Lin, Paolo Molignini, Luca Papariello, Marios C. Tsatsos, Camille Leveque, Storm E. Weiner, Elke Fasshauee, R. Chitra, Axel U. J. Lode
QUANTUM SCIENCE AND TECHNOLOGY
(2020)
Article
Physics, Multidisciplinary
Axel U. J. Lode, Sunayana Dutta, Camille Leveque
Summary: The dynamics of two-dimensional interacting ultracold bosons in an artificial gauge field were studied, revealing the implantation of angular momentum and emergence of fragmentation in the system. The experimental assessment of fragmentation and angular momentum was demonstrated to be possible through statistical analysis of image entropy variance.
Article
Physics, Multidisciplinary
Gaomin Tang, Christoph Bruder, Wolfgang Belzig
Summary: Superconductivity is usually destroyed by a magnetic field due to pair breaking, but spin-valley locking in a two-dimensional superconductor with spin-orbit interaction can make the superconducting state resilient to large magnetic fields. The interaction of in-plane magnetic field and Ising spin-orbit coupling results in noncollinear effective fields, leading to the emergence of mirage gaps in the spectrum. These mirage gaps are signatures of equal-spin triplet finite-energy pairing correlations and are sensitive to intervalley scattering.
PHYSICAL REVIEW LETTERS
(2021)
Article
Engineering, Electrical & Electronic
M. F. Ritter, N. Crescini, D. Z. Haxell, M. Hinderling, H. Riel, C. Bruder, A. Fuhrer, F. Nichele
Summary: Recent experiments have shown that superconductivity in metallic nanowires can be suppressed by applying a moderate gate voltage. This suppression is not due to the presence of electric fields at the nanowire surface, but rather requires the flow of high-energy electrons. The decay of these electrons into phonons, which propagate through the substrate and affect superconductivity, is the key factor in the suppression of superconductivity in nanowires.
NATURE ELECTRONICS
(2022)
Article
Quantum Science & Technology
Ryan Tan, Christoph Bruder, Martin Koppenhofer
Summary: This study focuses on the quantum synchronization of a single spin system driven by an external semi-classical signal, with spin numbers larger than S = 1. The interference-based quantum synchronization blockade is found to be qualitatively different for integer and half-integer spin numbers. The explanation lies in the interplay between the external signal and the limit cycle structure in generating coherence. Furthermore, the dissipative limit-cycle stabilization mechanism leads to different levels of quantum synchronization for integer and half-integer spins, but comparable levels can be achieved by choosing appropriate limit cycles.
Article
Optics
Michael Hughes, Axel U. J. Lode, Dieter Jaksch, Paolo Molignini
Summary: With the advancement in controlling and manipulating ultracold magnetic atoms and dipolar molecules, it is now possible to quantum simulate lattice models with strongly interacting dipole-dipole interactions and high densities. However, this study demonstrates that in regimes of strong dipole-dipole interactions and high densities, the continuum system fails to accurately recreate the desired lattice model. Two-band Hubbard models are required to reduce the discrepancies between continuum and lattice descriptions, but significant deviations in the density profile still remain.
Article
Optics
Paolo Molignini, Camille Leveque, Hans Kessler, Dieter Jaksch, R. Chitra, Axel U. J. Lode
Summary: This study investigates the infinite-range interactions in a one-dimensional boson array mediated by a laser-driven dissipative optical cavity. The results show that, at high laser pump powers, observables including density distributions, correlation functions, and superradiance order parameters become identical for both bosons and fermions. The study also reveals the compensation effect of cavity-mediated interactions on the reduction in the strength of contact interactions needed to trigger crystallization.
Article
Materials Science, Multidisciplinary
Gaomin Tang, Raffael L. Klees, Christoph Bruder, Wolfgang Belzig
Summary: This study investigates a Josephson junction formed by proximitized Ising superconductors with ferromagnetic layers, leading to highly tunable spin-triplet pairing correlations and modulation of charge and spin supercurrents. The charge current can be switched by changing the alignment of the in-plane exchange fields, and a pi state can be achieved. Additionally, the charge and spin current-phase relations exhibit phi 0-junction behavior with a strongly spin-polarized FM barrier.
Article
Optics
Axel U. J. Lode, Rui Lin, Miriam Buettner, Luca Papariello, Camille Leveque, R. Chitra, Marios C. Tsatsos, Dieter Jaksch, Paolo Molignini
Summary: This study demonstrates how artificial neural networks can optimize the extraction of observables from single-shot images, accurately obtaining both one- and two-particle densities, as well as extracting momentum-space observables from real-space single-shot images. With this technique, reconfiguring the experimental setup only once to obtain training data may lead to a significant reduction in resources.
Article
Physics, Multidisciplinary
Julian Arnold, Frank Schaefer, Martin Zonda, Axel U. J. Lode
Summary: The current interest lies in fully automated classification methods that offer direct physical insights into phase diagrams. It is desired to have interpretable methods that can explain why they classify phases as they do, and ideally these methods should be unsupervised, not requiring prior labeling or knowledge of phases. An unsupervised machine-learning method for phase classification is demonstrated here, made interpretable through an analytical derivation of the functional relationship between its predictions and input data, showcasing a physically-motivated, mean-based approach that is computationally efficient and directly explainable.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Computer Science, Artificial Intelligence
Frank Schafer, Pavel Sekatski, Martin Koppenhofer, Christoph Bruder, Michal Kloc
Summary: In this study, we proposed an automated control scheme design framework based on differentiable programming and utilized neural networks as controllers to stabilize a quantum bit to a target state successfully.
MACHINE LEARNING-SCIENCE AND TECHNOLOGY
(2021)
Article
Computer Science, Artificial Intelligence
Frank Schafer, Michal Kloc, Christoph Bruder, Niels Lorch
MACHINE LEARNING-SCIENCE AND TECHNOLOGY
(2020)
Article
Physics, Multidisciplinary
Martin Koppenhofer, Christoph Bruder, Alexandre Roulet
PHYSICAL REVIEW RESEARCH
(2020)
Article
Physics, Multidisciplinary
Gaomin Tang, Wolfgang Belzig, Ulrich Zuelicke, Christoph Bruder
PHYSICAL REVIEW RESEARCH
(2020)
Article
Physics, Multidisciplinary
Martin Koppenhoefer, Christoph Bruder, Niels Loerch
PHYSICAL REVIEW RESEARCH
(2020)
