Decoherence and dephasing in multilevel systems interacting with thermal environment

Details Decoherence and dephasing in multilevel systems interacting with thermal environment Decoherence and dephasing in multilevel systems interacting with thermal environment

2003-11-06

arxiv.org/abs/cond-mat/0311136v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 14 figures Submitted Phys. Rev. B

Scientific paper

We examine the effect of multilevels on decoherence and dephasing properties of a quantum system consisting of a non-ideal two level subspace, identified as the qubit and a finite set of higher energy levels above this qubit subspace. The whole system is under interaction with an environmental bath through a Caldeira-Leggett type coupling. The model interaction we use can generate nonnegligible couplings between the qubit states and the higher levels upto $N\sim 10$. In contrast to the pure two-level system, in a multilevel system the quantum information may leak out of the qubit subspace through nonresonant as well as resonant excitations induced by the environment. The decoherence properties of the qubit subspace is examined numerically using the master equation formalism of the system's reduced density matrix. We numerically examine the relaxation and dephasing times as the environmental frequency spectrum, the environmental temperature, and the multilevel system parameters are varied. We observe the influence of all energy scales in the noise spectrum on the short time dynamics implying the dominance of nonresonant transitions at short times. The relaxation and dephasing times calculated, strongly depend on $N$ for $4< N<10$ and saturate for $10

Affiliated with

Also associated with

No associations

Rating

Decoherence and dephasing in multilevel systems interacting with thermal environment 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 and dephasing in multilevel systems interacting with thermal environment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Decoherence and dephasing in multilevel systems interacting with thermal environment will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-519142