Aspects of the decoherence in high-spin environments: Breakdown of the mean-field approximation

Yamen Hamdouni
Phys. Rev. A 94, 022120 – Published 25 August 2016

Abstract

The study of the decoherence of qubits in spin systems is almost restricted to environments whose constituents are spin-12 particles. In this paper we consider environments that are composed of particles of higher spin, and we investigate the consequences on the dynamics of a qubit coupled to such baths via Heisenberg XY and Ising interactions. It is shown that, while the short time decay in both cases gets faster as the magnitude of the spin increases, the asymptotic behavior exhibits an improvement of the suppression of the decoherence when the coupling is through Heisenberg XY interactions. In the case of a transverse Ising model, we find that the mean-field approximation breaks down for high values of the spin.

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  • Received 3 April 2016

DOI:https://doi.org/10.1103/PhysRevA.94.022120

©2016 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalStatistical Physics & ThermodynamicsQuantum Information, Science & Technology

Authors & Affiliations

Yamen Hamdouni*

  • Department of Physics, Faculty of Exact Sciences, Mentouri University, Constantine, Algeria

  • *hamdouniyamen@gmail.com

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Issue

Vol. 94, Iss. 2 — August 2016

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