Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Asboth, J. K."'
Publikováno v:
Phys. Rev. A 93, 050101 (2016)
We consider recurrence to the initial state after repeated actions of a quantum channel. After each iteration a projective measurement is applied to check recurrence. The corresponding return time is known to be an integer for the special case of uni
Externí odkaz:
http://arxiv.org/abs/1510.09031
Publikováno v:
Phys. Rev. A 91, 042108 (2015)
The expected return time to the original state is a key concept characterizing systems obeying both classical or quantum dynamics. We consider iterated open quantum dynamical systems in finite dimensional Hilbert spaces, a broad class of systems that
Externí odkaz:
http://arxiv.org/abs/1411.0568
Publikováno v:
Phys. Rev. B 90, 125143 (2014)
Over the past few years, topological insulators have taken center stage in solid state physics. The desire to tune the topological invariants of the bulk and thus control the number of edge states has steered theorists and experimentalists towards pe
Externí odkaz:
http://arxiv.org/abs/1405.1709
Publikováno v:
Phys. Rev. A 89, 042327 (2014)
One-dimensional discrete-time quantum walks show a rich spectrum of topological phases that have so far been exclusively analysed in momentum space. In this work we introduce an alternative approach to topology which is based on the scattering matrix
Externí odkaz:
http://arxiv.org/abs/1401.2673
Autor:
Asboth, J. K.
Publikováno v:
Phys. Rev. B 86, 195414 (2012)
Discrete-time quantum walks have been shown to simulate all known topological phases in one and two dimensions. Being periodically driven quantum systems, their topological description, however, is more complex than that of closed Hamiltonian systems
Externí odkaz:
http://arxiv.org/abs/1208.2143
Publikováno v:
Phys. Rev. B 83, 134519 (2011)
The bulk microwave conductivity of a dirty d-wave superconductor is known to depend sensitively on the range of the disorder potential: long-range scattering enhances the conductivity, while short- range scattering has no effect. Here we show that th
Externí odkaz:
http://arxiv.org/abs/1012.4511
Publikováno v:
Phys. Rev. B 80, 224517 (2009)
We calculate the transmission of electrons and holes between two normal-metal electrodes (N), separated over a distance L by an impurity-free superconductor (S) with d-wave symmetry of the order parameter. Nodal lines of vanishing excitation gap form
Externí odkaz:
http://arxiv.org/abs/0909.5317
Autor:
Asboth, J. K., Domokos, P.
In two recent articles, Meiser and Meystre describe the coupled dynamics of a dense gas of atoms and an optical cavity pumped by a laser field. They make two important simplifying assumptions: (i) the gas of atoms forms a regular lattice and can be r
Externí odkaz:
http://arxiv.org/abs/0705.4174
Publikováno v:
Phys. Rev. Lett. 98, 203008 (2007)
We solve self-consistently the coupled equations of motion for trapped particles and the field of a one-dimensional optical lattice. Optomechanical coupling creates long-range interaction between the particles, whose nature depends crucially on the r
Externí odkaz:
http://arxiv.org/abs/cond-mat/0611690
Publikováno v:
Phys. Rev. A 72, 05341 (2005)
We present a detailed study of the spatial self-organization of laser-driven atoms in an optical cavity, an effect predicted on the basis of numerical simulations [P. Domokos and H. Ritsch, Phys. Rev. Lett. 89, 253003 (2002)] and observed experimenta
Externí odkaz:
http://arxiv.org/abs/quant-ph/0508074