53 citations · 491 across the 36 of their papers we have counts for
22 papers · 1 filter
Super-Tonks-Girardeau Quench in the Extended Bose-Hubbard Model
Maciej Marciniak, Maciej Łebek, Jakub Kopyciński +3
We investigate the effect of a quench from a one-dimensional gas with strong and repulsive local interactions to a strongly attractive one, known as the super-Tonks-Girardeau effec…
Quantum Monte Carlo-based density functional for one-dimensional Bose-Bose mixtures
Jakub Kopyciński, Luca Parisi, Nick G. Parker +1
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…
Phase diagram and elementary excitations of strongly interacting droplets with non-local interactions
Maciej Łebek, Jakub Kopyciński, Wojciech Górecki +2
A one-dimensional bosonic gas with strong contact repulsion and attractive non-local interactions may form a quantum droplet with a flat-top density profile. We focus on a system i…
Ultrawide dark solitons and droplet-soliton coexistence in a dipolar Bose gas with strong contact interactions
Jakub Kopyciński, Maciej Łebek, Wojciech Górecki +1
We look into dark solitons in a quasi-1D dipolar Bose gas and in a quantum droplet. We derive the analytical solitonic solution of a Gross-Pitaevskii-like equation accounting for b…
Beyond Gross-Pitaevskii equation for 1D gas: quasiparticles and solitons
Jakub Kopyciński, Maciej Łebek, Maciej Marciniak +3
Describing properties of a strongly interacting quantum many-body system poses a serious challenge both for theory and experiment. In this work, we study excitations of one-dimensi…
Observation of Microcanonical Atom Number Fluctuations in a Bose-Einstein Condensate
M. B. Christensen, T. Vibel, A. J. Hilliard +6
Quantum systems are typically characterized by the inherent fluctuation of their physical observables. Despite this fundamental importance, the investigation of the fluctuations in…
Strongly correlated quantum droplets in quasi-1D dipolar Bose gas
Rafał Ołdziejewski, Wojciech Górecki, Krzysztof Pawłowski +1
We exploit a few- to many-body approach to study strongly interacting dipolar bosons in the quasi-one-dimensional system. The dipoles attract each other while the short range inter…
Dark solitons revealed in Lieb-Liniger eigenstates
Weronika Golletz, Wojciech Górecki, Rafał Ołdziejewski +1
We study how dark solitons, i.e. solutions of one-dimensional single-particle nonlinear time-dependent Schrödinger equation, emerge from eigenstates of a linear many-body model of…
Superadiabatic generation of cat states in bosonic Josephson junctions under particle losses
Takuya Hatomura, Krzysztof Pawłowski
We investigate a superadiabatic scheme to produce a cat state in a bosonic Josephson junction in absence and presence of particle losses. The generation scheme is based on shortcut…
Observation of Atom Number Fluctuations in a Bose-Einstein Condensate
M. A. Kristensen, M. B. Christensen, M. Gajdacz +7
Fluctuations are a key property of both classical and quantum systems. While the fluctuations are well understood for many quantum systems at zero temperature, the case of an inter…
Metrologically useful states of spin-1 Bose condensates with macroscopic magnetization
Dariusz Kajtoch, Krzysztof Pawłowski, Emilia Witkowska
We study theoretically the usefulness of spin-1 Bose condensates with macroscopic magnetization in a homogeneous magnetic field for quantum metrology. We demonstrate Heisenberg sca…
Mesoscopic quantum superpositions in bimodal Bose-Einstein condensates: decoherence and strategies to counteract it
Krzysztof Pawlowski, Matteo Fadel, Philipp Treutlein +2
We study theoretically the interaction-induced generation of mesoscopic coherent spin state superpositions (small cat states) from an initial coherent spin state in bimodal Bose-Ei…
Anomalous oscillations of dark solitons in trapped dipolar condensates
T. Bland, K. Pawlowski, M. J. Edmonds +2
Thanks to their immense purity and controllability, dipolar Bose-Einstein condensates are an exemplar for studying fundamental non-local nonlinear physics. Here we show that a fami…
Dipolar dark solitons
Krzysztof Pawlowski, Kazimierz Rzazewski
We numerically generate, and then study the basic properties of dark soliton-like excitations in a dipolar gas confined in a quasi one dimensional trap. These excitations, although…
Effect of one-, two-, and three-body atom loss processes on superpositions of phase states in Bose-Josephson junctions
Dominique Spehner, Krzysztof Pawlowski, Giulia Ferrini +1
In a two-mode Bose-Josephson junction formed by a binary mixture of ultracold atoms, macroscopic superpositions of phase states are produced during the time evolution after a sudde…
Ground state of a two component dipolar Fermi gas in a harmonic potential
Przemyslaw Bienias, Krzysztof Pawlowski, Tilman Pfau +1
Interacting two component Fermi gases are at the heart of our understanding of macroscopic quantum phenomena like superconductivity. Changing nature of the interaction is expected…
Spin squeezing and EPR entanglement of two bimodal condensates in state-dependent potentials
Hadrien Kurkjian, Krzysztof Pawlowski, Philipp Treutlein +1
We propose and analyze a scheme to entangle the collective spin states of two spatially separated bimodal Bose-Einstein condensates. Using a four-mode approximation for the atomic…
Correlations of quasi-2D dipolar ultracold gas at finite temperatures
Krzysztof Pawlowski, Przemyslaw Bienias, Tilman Pfau +1
We study a quasi two dimensional dipolar gas at finite, but ultralow temperatures using the classical field approximation. The method, already used for a contact interacting gas, i…
Spontaneous solitons in the thermal equilibrium of a quasi-one-dimensional Bose gas
T. Karpiuk, P. Deuar, P. Bienias +5
Solitons, or non-destructible local disturbances, are important features of many one-dimensional (1D) nonlinear wave phenomena, from water waves in narrow canals to light pulses in…
Mean-field description of dipolar bosons in triple-well potentials
David Peter, Krzysztof Pawlowski, Tilman Pfau +1
We investigate the ground state properties of a polarized dipolar Bose-Einstein condensate trapped in a triple-well potential. By solving the dipolar Gross-Pitaevskii equation nume…
Revivals in the attractive BEC in a double-well potential and their decoherence
Krzysztof Pawlowski, Pawel Zin, Kazimierz Rzazewski +1
We study the dynamics of ultracold attractive atoms in a weakly linked two potential wells. We consider an unbalanced initial state and monitor dynamics of the population differenc…
Background atoms and decoherence in optical lattices
Krzysztof Pawlowski, Kazimierz Rzazewski
All experiments with ultracold atoms are performed in the presence of background residual gas. With the help of a suitable master equation we investigate a role of these fast atoms…