Evolution of a quantum spin system to its ground state: Role of entanglement and interaction symmetry

Details Evolution of a quantum spin system to its ground state: Role of entanglement and interaction symmetry Evolution of a quantum spin system to its ground state: Role of entanglement and interaction symmetry

2007-01-19

arxiv.org/abs/cond-mat/0701490v2

Phys. Rev. A 75, 052109 (2007)

Physics

Condensed Matter

Other Condensed Matter

to appear in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.75.052109

We study the decoherence of two ferro- and antiferromagnetically coupled spins that interact with a frustrated spin-bath environment in its ground state. The conditions under which the two-spin system relaxes from the initial spin-up - spin-down state towards its ground state are determined. It is shown that the two-spin system relaxes to its ground state for narrow ranges of the model parameters only. It is demonstrated that the symmetry of the coupling between the two-spin system and the environment has an important effect on the relaxation process. In particular, we show that if this coupling conserves the magnetization, the two-spin system readily relaxes to its ground state whereas a non-conserving coupling prevents the two-spin system from coming close to its ground state.

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