Marek Trippenbach
University of Warsaw
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Publication
Featured researches published by Marek Trippenbach.
Optics Express | 2006
Michał Matuszewski; Christian R. Rosberg; Dragomir N. Neshev; Andrey A. Sukhorukov; Arnan Mitchell; Marek Trippenbach; Michael W. Austin; Wieslaw Krolikowski; Yuri S. Kivshar
We predict a sharp crossover from nonlinear self-defocusing to discrete self-trapping of a narrow Gaussian beam with the increase of the refractive index contrast in a periodic photonic lattice. We demonstrate experimentally nonlinear discrete localization of light with defocusing nonlinearity by single site excitation in LiNbO(3) waveguide arrays.
Reviews of Modern Physics | 2012
W. Vassen; Claude Cohen-Tannoudji; M. Leduc; Denis Boiron; C. I. Westbrook; Andrew Truscott; Kenneth G. H. Baldwin; G. Birkl; P. Cancio; Marek Trippenbach
Experimental work on cold, trapped metastable noble gases is reviewed. The aspects which distinguish work with these atoms from the large body of work on cold, trapped atoms in general is emphasized. These aspects include detection techniques and collision processes unique to metastable atoms. Several experiments exploiting these unique features in fields including atom optics and statistical physics are described. Precision measurements on these atoms including fine structure splittings, isotope shifts, and atomic lifetimes are also discussed.
Physical Review Letters | 2010
Valentina Krachmalnicoff; Jean-Christophe Jaskula; Marie Bonneau; Vanessa Leung; Guthrie B. Partridge; Denis Boiron; C. I. Westbrook; P. Deuar; Paweł Ziń; Marek Trippenbach; K. V. Kheruntsyan
We investigate the atom-optical analog of degenerate four-wave mixing by colliding two Bose-Einstein condensates of metastable helium. The momentum distribution of the scattered atoms is measured in three dimensions. A simple analogy with photon phase matching conditions suggests a spherical final distribution. We find, however, that it is an ellipsoid with radii smaller than the initial collision momenta. Numerical and analytical calculations agree with this and reveal the interplay between many-body effects, mean-field interaction, and the anisotropy of the source condensate.
Physical Review A | 2008
Marek Trippenbach; Eryk Infeld; J Gocalek; Michał Matuszewski; M. K. Oberthaler; Boris A. Malomed
We introduce a two dimensional model for the Bose-Einstein condensate with both attractive and repulsive nonlinearities. We assume a combination of a double well potential in one direction, and an optical lattice along the perpendicular coordinate. We look for dual core solitons in this model, focusing on their symmetry-breaking bifurcations. The analysis employs a variational approximation, which is verified by numerical results. The bifurcation which transforms antisymmetric gap solitons into asymmetric ones is of supercritical type in the case of repulsion; in the attraction model, increase of the optical latttice strength leads to a gradual transition from subcritical bifurcation (for symmetric solitons) to a supercritical one.
Physical Review Letters | 2010
Piotr Szańkowski; Marek Trippenbach; Eryk Infeld; George Rowlands
We investigate the properties of three component BEC systems with spin exchange interactions. We consider different coupling constants from those very special ones leading to exact solutions known in the literature. When two solitons collide, a spin component oscillation of the two emerging entities is observed. This behavior seems to be generic. A mathematical model is derived for the emerging solitons. It describes the new oscillatory phenomenon extremely well. Surprisingly, the model is in fact an exact solution to the initial equations. This comes as a bonus.
Physical Review A | 2014
Piotr Szańkowski; Marek Trippenbach; Jan Chwedeńczuk
We demonstrate that memory in an
EPL | 2008
Paweł Ziń; Jan Chwedeńczuk; Bartłomiej Oleś; Krzysztof Sacha; Marek Trippenbach
N
Physical Review E | 2006
Eryk Infeld; Paweł Ziń; J. Gocałek; Marek Trippenbach
-qubit system subjected to decoherence, is a potential resource for the slow-down of the entanglement decay. We show that this effect can be used to retain the sub shot-noise sensitivity of the parameter estimation in quantum interferometry. We calculate quantum Fisher information, which sets the ultimate bound for the precision of the estimation. We also derive the sensitivity of such a noisy interferometer, when the phase is either estimated from the measurements of the population imbalance or from the one-body density.
Bulletin of the American Physical Society | 2016
Lukasz Cywinski; Piotr Szańkowski; Marek Trippenbach
We consider a Bose gas with an attractive interaction in a symmetric double-well potential. In the mean-field approximation, the ground-state solution spontaneously breaks the symmetry of the trapping potential above a certain value of the interaction strength. We demonstrate how the Landau-Ginzburg scheme of the second-order phase transition emerges from the quantum model and show the link to the spontaneous symmetry breaking mentioned above. We identify the order parameter, the critical point and analyze quantum fluctuations around it.
Optics Communications | 2003
Michał Matuszewski; Wojciech Wasilewski; Marek Trippenbach; Yehuda B. Band
We treat the behavior of Bose-Einstein condensates in double square well potentials of both equal and different depths. For even depth, symmetry preserving solutions to the relevant nonlinear Schrödinger equation are known, just as in the linear limit. When the nonlinearity is strong enough, symmetry breaking solutions also exist, side by side with the symmetric one. Interestingly, solutions almost entirely localized in one of the wells are known as an extreme case. Here we outline a method for obtaining all these solutions for repulsive interactions. The bifurcation point at which, for critical nonlinearity, the asymmetric solutions branch off from the symmetry preserving ones is found analytically. We also find this bifurcation point and treat the solutions generally via a Josephson junction model. When the confining potential is in the form of two wells of different depth, interesting phenomena appear. This is true of both the occurrence of the bifurcation point for the static solutions and also of the dynamics of phase and amplitude varying solutions. Again a generalization of the Josephson model proves useful. The stability of solutions is treated briefly.