Anomalous diffusion and environment-induced quantum decoherence.

Physical Review Letters

We report on the experimental observation of environment induced decoherence in the quantum deltakicked rotor. Ultracold cesium atoms are subjected to a pulsed standing wave of near resonant light. Spontaneous scattering of photons destroys dynamical localization thereby giving rise to a quantum diffusion, which approaches the classical diffusion with an increasing degree of decoherence. This t...

ar X iv : h ep - t h / 95 01 05 4 v 1 1 3 Ja n 19 95 Environment - Induced Effects on Quantum Chaos : Decoherence , Delocalization and Irreversibility ∗

Decoherence in quantum systems which are classically chaotic is studied. It is wellknown that a classically chaotic system when quantized loses many prominent chaotic traits. We show that interaction of the quantum system with an environment can under general circumstances quickly diminish quantum coherence and reenact some characteristic classical chaotic behavior. We use the Feynman-Vernon in...

Phase-space decoherence: A comparison between consistent histories and environment-induced superselection.

We examine the decoherence properties of a quantum open system as modeled by a quantum optical system in the Markov regime. We look for decoherence in both the Environment Induced Superselection (EIS) and Consistent Histories (CH) frameworks. We propose a general measure of the coherence of the reduced density matrix and find that EIS decoherence occurs in a number of bases for this model. The ...

Decoherence effects on quantum Fisher information of multi-qubit W states

Quantum fisher information of a parameter characterizing the sensitivity of a state with respect to parameter changes. In this paper, we study the quantum fisher information of the W state for four, five, six and seven particles in decoherence channels, such as amplitude damping, phase damping and depolarizing channel. Using Krauss operators for decoherence channels components, we investigate t...

Highly Nonclassical Quantum States and Environment Induced Decoherence Highly Nonclassical Quantum States and Environment Induced Decoherence