Anastopoulos, C., Shresta, S., Hu, B. L.
We study the non-equilibrium dynamics of a pair of qubits made of two-level atoms separated in space with distance $r$ and interacting with one common electromagnetic field but not directly with each...
Quantum measurement theory for particle oscillations (2009)
Anastopoulos, C., Savvidou, N.
A fundamental principle of quantum theory, clearly manifested in the two-slit experiment, is that for any alternatives that cannot be distinguished by measurement physical predictions are obtained by...
Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics (2008)
Abat, E., Abbott, B., Abdallah, J., Abdelalim, A. A., Abdesselam, A., ...
A detailed study is presented of the expected performance of the ATLAS detector. The reconstruction of tracks, leptons, photons, missing energy and jets is investigated, together with the performance...
Intrinsic and Fundamental Decoherence: Issues and Problems (2008)
We investigate the meaning of gravity-induced decoherence in quantum theory, known as `intrinsic' or `fundamental' decoherence in the literature. We explore a range of issues relevant to this...
Decoherence in Quantum Gravity: Issues and Critiques (2007)
An increasing number of papers have appeared in recent years on decoherence in quantum gravity at the Planck energy. We discuss the meaning of decoherence in quantum gravity starting from the common...
Anastopoulos, C., Shresta, S., Hu, B. L.
We study the non-equilibrium dynamics of a pair of qubits made of two-level atoms separated in space with distance r and interacting with one common electromagnetic field but not directly with each...
Quantum probabilities for time-extended measurements (2006)
Anastopoulos, C., Savvidou, N.
We study the probability assignment for the outcomes of time-extended measurements. We construct the class-operator that incorporates the information about a generic time-smeared quantity. These...
Shresta, S., Anastopoulos, C., Dragulescu, A., Hu, B. L.
We study the non-Markovian dynamics of a qubit made up of a two-level atom interacting with an electromagnetic field (EMF) initially at finite temperature. Unlike most earlier studies where the bath...
Quantum Fields in Nonstatic background: A Histories Perspective (1999)
For a quantum field living on a non - static spacetime no instantaneous Hamiltonian is definable, for this generically necessitates a choice of inequivalent representation of the canonical...
Classicality via hydrodynamics in quantum field theory (1998)
Motivated by the consistent histories approach to quantum mechanics, we examine a simple model of hydrodynamic coarse-graining for a scalar field. It consists in averaging the field over spatial...
Information measures and classicality in quantum mechanics (1998)
We study information measures in quantu mechanics, with particular emphasis on providing a quantification of the notions of classicality and predictability. Our primary tool is the Shannon - Wehrl...
Non-Equilibrium Quantum Electrodynamics (1997)
We employ the influence functional technique to trace out the photonic contribution from full quantum electrodynamics. The reduced density matrix propagator for the spinor field is then constructed....
On the selection of preferred consistent sets (1997)
The theme of this paper is the multiplicity of the consistent sets appearing in the consistent histories approach to quantum mechanics. We propose one criterion for choosing preferred families among...
N-particle sector of quantum field theory as a quantum open system (1996)
We give an exposition of a technique, based on the Zwanzig projection formalism, to construct the evolution equation for the reduced density matrix corresponding to the n-particle sector of a field...
Coarse Grainings and Irreversibility in Quantum Field Theory (1996)
In this paper we are interested in the studying coarse-graining in field theories using the language of quantum open systems. Motivated by the ideas of Calzetta and Hu on correlation histories we...
Quantum Theory of Non-Relativistic Particles Interacting with Gravity (1995)
We investigate the effects of the gravitational field on the quantum dynamics of non-relativistic particles. We consider N non-relativistic particles, interacting with the linearized gravitational...
Decoherence and classical predictability of phase space histories (1995)
We consider the decoherence of phase space histories in a class of quantum Brownian motion models, consisting of a particle moving in a potential $V(x)$ in interaction with a heat bath at temperature...
Generalized Uncertainty Relations and Long Time Limits for Quantum Brownian Motion Models (1994)
Anastopoulos, C., Halliwell, J. J.
We study the time evolution of the reduced Wigner function for a class of quantum Brownian motion models. We derive two generalized uncertainty relations. The first consists of a sharp lower bound on...