Zobrazeno 1 - 10
of 54
pro vyhledávání: '"Rapedius, K"'
Autor:
Korsch, H J, Rapedius, K
Publikováno v:
Europ. J. Phys. 37 (2016) 055410
Convenient and simple numerical techniques for performing quantum computations based on matrix representations of Hilbert space operators are presented and illustrated by various examples. The applications include the calculations of spectral and dyn
Externí odkaz:
http://arxiv.org/abs/1603.04167
Autor:
Rapedius, K.
So far the Bloch-Siegert shift of the Rabi model has only been calculated numerically or by means of perturbation theory valid in either the weak or strong driving regime only. Recently Yan, L\"u, and Zheng [Phys.~Rev.~A {\bf 91}, 053834 (2015)] show
Externí odkaz:
http://arxiv.org/abs/1512.00387
Autor:
Rapedius, K.
Publikováno v:
J. Phys. B: At. Mol. Opt. Phys. 46 (2013) 125301
A Bose-Hubbard Hamiltonian, modeling cold bosons in an optical lattice, is used to simulate the dynamics of interacting open quantum systems as subsystems a larger closed system, avoiding complications like the introduction of baths, complex absorbin
Externí odkaz:
http://arxiv.org/abs/1212.5379
Autor:
Rapedius, K., Korsch, H. J.
Publikováno v:
Phys. Rev. A 86, 025601 (2012)
We study the influence of particle interaction on a quantum walk on a bipartite one-dimensional lattice with decay from every second site. The corresponding non-interacting (linear) system has been shown to have a topological transition described by
Externí odkaz:
http://arxiv.org/abs/1205.4511
Publikováno v:
J. Phys. B: At. Mol. Opt. Phys. 44 (2011) 225301
The resonance spectrum of a tilted periodic quantum system for a bichromatic periodic potential is investigated. For such a bichromatic Wannier-Stark system exceptional points, degeneracies of the spectrum, can be localized in parameter space by mean
Externí odkaz:
http://arxiv.org/abs/1109.0808
Publikováno v:
Phys. Rev. A 82, 063601 (2010)
We study the tunneling decay of a Bose-Einstein condensate out of tilted optical lattices within the mean-field approximation. We introduce a novel method to calculate also excited resonance eigenstates of the Gross-Pitaevskii equation, based on a gr
Externí odkaz:
http://arxiv.org/abs/1005.3541
Autor:
Rapedius, K, Korsch, H J
Publikováno v:
J. Phys. A: Math. Theor. 42 (2009) 425301
For the stationary one-dimensional nonlinear Schr\"odinger equation (or Gross-Pitaevskii equation) nonlinear resonant transmission through a finite number of equidistant identical barriers is studied using a (semi-) analytical approach. In addition t
Externí odkaz:
http://arxiv.org/abs/0908.4475
Autor:
Rapedius, K., Korsch, H. J.
Publikováno v:
J. Phys. B: At. Mol. Opt. Phys. 42 (2009) 044005
The resonance states and the decay dynamics of the nonlinear Schr\"odinger (or Gross-Pitaevskii) equation are studied for a simple, however flexible model system, the double delta-shell potential. This model allows analytical solutions and provides i
Externí odkaz:
http://arxiv.org/abs/0809.2748
Autor:
Rapedius, K., Korsch, H. J.
Publikováno v:
J. Phys. A: Math. Theor. 41 (2008) 355001
In this communication we report on a peculiar property of barrier transmission that systems governed by the nonlinear Schroedinger equation share with the linear one: For unit transmission the potential can be divided at an arbitrary point into two s
Externí odkaz:
http://arxiv.org/abs/0805.2078
Autor:
Rapedius, K., Korsch, H. J.
Publikováno v:
Phys. Rev. A 77, 063610 (2008)
The stationary nonlinear Schr\"odinger equation (or Gross-Pitaevskii equation) for one-dimensional potential scattering is studied. The nonlinear transmission function shows a distorted profile, which differs from the Lorentzian one found in the line
Externí odkaz:
http://arxiv.org/abs/0706.2826