Coherence Window in the dynamics of Quantum Nanomagnets

Details Coherence Window in the dynamics of Quantum Nanomagnets Coherence Window in the dynamics of Quantum Nanomagnets

2003-02-02

arxiv.org/abs/cond-mat/0302015v3

Phys. Rev. B 69, 014401 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 LaTeX pages, 3 figures

Scientific paper

10.1103/PhysRevB.69.014401

Decoherence in many solid-state systems is anomalously high, frustrating efforts to make solid-state qubits. We show that in nanomagnetic insulators in large transverse fields, there can be a fairly narrow field region in which both phonon and nuclear spin-mediated decoherence are drastically reduced. As examples we calculate decoherence rates for the $Fe$-8 nanomolecule, for $Ni$ particles, and for $Ho$ ions in $LiHo_xY_{1-z}F_4$. The reduction in the decoherence, compared to low field rates, can exceed 6 orders of magnitude. The results also give limitations on the observability of macroscopic coherence effects in magnetic systems.

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