"Entanglement and decoherence of ultracold gases"

financed by National Science Center SONATA 7

‍Project - main idea
‍
The topic is on the border between Quantum Information and physics of ultracold gases. There exist relatively simple conceptually schemes, which use either collisions between atoms or interaction between light and matter, to produce highly entangled atomic state (including even the Schroedinger cat). Unfortunately, always the entangling unitary dynamics is assisted by dissipative procesess, killing the quantum coherence. The aim of the project is to find the limitations of such schemes, including the unavoidable decoherence processes.

Main results
‍
Explicite, realistic conditions to create Schrodinger cat state in ultracold gases.
Explicite, realistic conditions to create Einstein-Podolsky-Rosen correlations in ultracold gas.
New method to stop entanglement dynamics and store the quantum correlations by self trapping.
Thermal entangled states in F=1 spinor condensates.

2019

M.A. Kristensen, M.B. Christensen, M. Gajdacz, M. Iglicki, K. Pawłowski,
C. Klempt, J.F.Sherson, K. Rzazewski, A.J.Hilliard, J.J.Arlt
Observation of Atom Number Fluctuations in a Bose-Einstein Condensate
PRL 122, 163601 (2019) Editor's Suggestion
arxiv

T. Hatomura, K. Pawłowski
Superadiabatic generation of cat states in bosonic Josephson junctions under particle losses
PRA 99, 043621 (2019) in Kalejdoscope of PRA,
arxiv

2018

R. Oldziejewski, W. Gorecki K. Pawłowski, K. Rzazewski
Many-body soliton-like states of bosonic ideal gas
PRA 97, 063617 (2018) in Kalejdoscope of PRA,
arxiv

R. Oldziejewski, W. Gorecki K. Pawłowski, K. Rzazewski
Roton in a few-body dipolar system
NJP 20, 123006 (2018)
arxiv

D. Kajtoch, K. Pawłowski, E. Witkowska
Metrologically useful states of spin-1 Bose condensates with macroscopic magnetization
PRA 97, 023616 (2018)
arxiv

2017

K. Szymanski, K. Pawłowski
Evolution of entanglement under an Ising-like Hamiltonian with particle losses
PRA 96, 062312 (2017)
arxiv

H. Kurkjian, K. Pawłowski, A. Sinatra
EPR-entangled Bose-Einstein condensates in state-dependent potentials: a dynamical study
PRA 96, 013621 (2017)
hal,

K. Pawłowski, M. Fadel, P, Treutlein, Y. Castin, A. Sinatra
Mesoscopic quantum superpositions in bimodal Bose-Einstein condensates: decoherence and strategies to counteract it
PRA 95, 063609 (2017)
in Kalejdoscope of PRA, hal, arxiv

K. Pawłowski, Ł.A. Turski
On the Dissipative Version of the Gross-Pitaevski Equation
Phys. Lett. A, 381, 1710 (2017)
arxiv

2016

D. Kajtoch, K. Pawłowski, E. Witkowska
Entanglement storage by classcial fixed points in the two-axis countertwisting model
Physical Review A, 93, 022331 (2016)
in Kalejdoscope of PRA