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40 papers · 2 filters
Geometric Phases and Critical Phenomena in a Chain of Interacting Spins
M. E. Reuter, M. J. Hartmann, M. B. Plenio
The geometric phase can act as a signature for critical regions of interacting spin chains in the limit where the corresponding circuit in parameter space is shrunk to a point and…
Unified approach to QED in arbitrary linear media
Christian Raabe, Stefan Scheel, Dirk-Gunnar Welsch
We give a unified approach to macroscopic QED in arbitrary linearly responding media, based on the quite general, nonlocal form of the conductivity tensor as it can be introduced w…
On quantum microcanonical equilibrium
Dorje C. Brody, Daniel W. Hook, Lane P. Hughston
A quantum microcanonical postulate is proposed as a basis for the equilibrium properties of small quantum systems. Expressions for the corresponding density of states are derived,…
Entanglement of three-qubit geometry
Dorje C. Brody, Anna C. T. Gustavsson, Lane P. Hughston
Geometric quantum mechanics aims to express the physical properties of quantum systems in terms of geometrical features preferentially selected in the space of pure states. Geometr…
Sequential Generation of Matrix-Product States in Cavity QED
C. Schoen, K. Hammerer, M. M. Wolf +2
We study the sequential generation of entangled photonic and atomic multi-qubit states in the realm of cavity QED. We extend the work of C. Schoen et al. [Phys. Rev. Lett. 95, 1105…
General linear-optical quantum state generation scheme: Applications to maximally path-entangled states
N. M. VanMeter, P. Lougovski, D. B. Uskov +3
We introduce schemes for linear-optical quantum state generation. A quantum state generator is a device that prepares a desired quantum state using product inputs from photon sourc…