Decoherence from spin environments

Details Decoherence from spin environments Decoherence from spin environments

2005-08-24

arxiv.org/abs/quant-ph/0508184v1

Phys. Rev. A 72, 052113 (2005)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.72.052113

We examine two exactly solvable models of decoherence -- a central spin-system, (i) with and (ii) without a self--Hamiltonian, interacting with a collection of environment spins. In the absence of a self--Hamiltonian we show that in this model (introduced some time ago to illustrate environment--induced superselection) generic assumptions about the coupling strengths can lead to a universal (Gaussian) suppression of coherence between pointer states. On the other hand, we show that when the dynamics of the central spin is dominant a different regime emerges, which is characterized by a non--Gaussian decay and a dramatically different set of pointer states. We explore the regimes of validity of the Gaussian--decay and discuss its relation to the spectral features of the environment and to the Loschmidt echo (or fidelity).

Affiliated with

Also associated with

No associations

Rating

Decoherence from spin environments does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Decoherence from spin environments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Decoherence from spin environments will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-263163