Decoherence by a spin thermal bath: Role of the spin-spin interactions and initial state of the bath

Abstract

We study the decoherence of two coupled spins that interact with a spin-bath environment. It is shown that the connectivity and the coupling strength between the spins in the environment are of crucial importance for the decoherence of the central system. For the anisotropic spin-bath, changing the connectivity or coupling strenghts changes the decoherence of the central system from Gaussian to exponential decay law. The initial state of the environment is shown to affect the decoherence process in a qualitatively significant manner.

submitted to PRB

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• Probing a composite spin-boson environment
• Relaxation, thermalization and Markovian dynamics of two spins coupled to a spin bath
• Manipulating and protecting entanglement by means of spin environments
• Dual-probe decoherence microscopy: Probing pockets of coherence in a decohering environment
• Dynamics of open quantum spin systems: An assessment of the quantum master equation approach
• Decoherence of a singlet-triplet superposition state under dipolar interactions of an uncorrelated environment
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• Temperature crossover of decoherence rates in chaotic and regular bath dynamics
• Relaxation of antiferromagnetic order and growth of Rényi entropy in a generalized Heisenberg star
• Coexistence of the antiferromagnetic and superconducting order and its effect on spin dynamics in electron-doped high-$T_c$ cuprates