Instantaneous and dynamical decoherence

Quantum Dynamical Semigroups and Decoherence

Decoherence versus Dynamical Casimir Effect

By means of two simple examples: phase and amplitude damping, the impact of decoherence on the dynamical Casimir effect is investigated. Even without dissipating energy (i.e., pure phase damping), the amount of created particles can be diminished significantly via the coupling to the environment (reservoir theory) inducing decoherence. For a simple microscopic model, it is demonstrated that spo...

Quantum Chaos, Dynamical Stability and Decoherence

Giulio Casati1,2,3 and Tomaž Prosen4 1 Center for Nonlinear and Complex Systems, Universita’ degli Studi dell’Insubria, 22100 Como, Italy 2 Istituto Nazionale per la Fisica della Materia, unita’ di Como, 22100 Como, Italy, 3 Istituto Nazionale di Fisica Nucleare, sezione di Milano, 20133 Milano, Italy, 4 Department of Physics, Faculty of mathematics and physics, University of Ljubljana, 1000 Lj...

Quantum dynamical entropy and decoherence rate

We investigate quantum dynamical systems defined on a finite-dimensional Hilbert space and subjected to an interaction with an environment. The rate of decoherence of initially pure states, measured by the increase of their von Neumann entropy, averaged over an ensemble of random pure states, is proved to be bounded from above by the partial entropy used to define the ALF-dynamical entropy. The...

Optimal dynamical decoherence control of a qubit.

We present a theory of dynamical control by modulation for optimal decoherence reduction. The theory is based on the non-Markovian Euler-Lagrange equation for the energy-constrained field that minimizes the average dephasing rate of a qubit for any given dephasing spectrum.