Coherence Window in the dynamics of Quantum Nanomagnets

Abstract

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 $LiH{o}_x{Y}_{1-z}{F}_4$. 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.

5 LaTeX pages, 3 figures

References in corpus (2)

• Coherent Spin Oscillations in a Disordered Magnet
• Quantum tunnelling of magnetization in Mn12-ac studied by 55Mn NMR

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