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12 papers · 2 filters
Time evolution of continuous-time quantum walks on dynamical percolation graphs
Zoltán Darázs, Tamás Kiss
We study the time evolution of continuous-time quantum walks on randomly changing graphs. At certain moments edges of the graph appear or disappear with a given probability. We foc…
Finite-size scaling in the quantum phase transition of the open-system Dicke-model
G. Konya, D. Nagy, G. Szirmai +1
Laser-driven Bose-Einstein condensate of ultracold atoms loaded into a lossy high-finesse optical resonator exhibits critical behavior and, in the thermodynamic limit, a phase tran…
Adequacy of the Dicke model in cavity QED: a counter-"no-go" statement
András Vukics, Peter Domokos
The long-standing debate whether the phase transition in the Dicke model can be realized with dipoles in electromagnetic fields is yet an unsettled one. The well-known statement of…
Permutationally invariant state reconstruction
Tobias Moroder, Philipp Hyllus, Geza Toth +5
Feasible tomography schemes for large particle numbers must possess, besides an appropriate data acquisition protocol, also an efficient way to reconstruct the density operator fro…
Bell inequality and common causal explanation in algebraic quantum field theory
Gábor Hofer-Szabó, Péter Vecsernyés
Bell inequalities, understood as constraints between classical conditional probabilities, can be derived from a set of assumptions representing a common causal explanation of class…
Entanglement and Extreme Spin Squeezing for a Fluctuating Number of Indistinguishable Particles
Philipp Hyllus, Luca Pezze, Augusto Smerzi +1
We extend the criteria for -particle entanglement from the spin squeezing parameter presented in [A.S. Sørensen and K. Mølmer, Phys. Rev. Lett. {\bf 86}, 4431 (2001)] to systems…