Decoherence dynamics of interacting qubits coupled to a bath of local optical phonons
Abstract
We study decoherence in an interacting qubit system described by infinite range Heisenberg model (IRHM) in a situation where the system is coupled to a bath of local optical phonons. Using perturbation theory in polaron frame of reference, we derive an effective Hamiltonian that is valid in the regime of strong spin-phonon coupling under non-adiabatic conditions. It is shown that the effective Hamiltonian commutes with the IRHM upto leading orders of perturbation and thus has the same eigenstates as the IRHM. Using a quantum master equation with Markovian approximation of dynamical evolution, we show that the off diagonal elements of the density matrix donot decay in the energy eigen basis of IRHM.
Keywords
Cite
@article{arxiv.1601.05163,
title = {Decoherence dynamics of interacting qubits coupled to a bath of local optical phonons},
author = {Muzaffar Qadir Lone and Sudhakar Yarlaggada},
journal= {arXiv preprint arXiv:1601.05163},
year = {2016}
}
Comments
Accepted in Int. J. Mod. Phys. B. arXiv admin note: substantial text overlap with arXiv:1205.4093, arXiv:1012.3543