Comment on "Universal Decoherence in Solids"
L. A. Openov
TL;DR
This paper critiques a proposed formula for decoherence rate in solids, highlighting its limited validity and providing a more general expression for phonon-induced transition probabilities.
Contribution
It identifies the limitations of Chudnovsky's decoherence formula and offers a more accurate, general expression for phonon-induced transition probabilities.
Findings
Chudnovsky's formula is only valid within a limited range.
The Fermi golden rule was unjustifiably used in the original formula.
A more general expression for phonon-induced transition probability is presented.
Abstract
We discuss the formula for the decoherence rate proposed by Eugene M. Chudnovsky [Phys. Rev. Lett. 92, 120405 (2004)]. We show that it has a limited range of validity and is not applicable to evaluation of the width of a low-energy optical mode considered by Chudnovsky as an example. This is due to unjustified use of the Fermi golden rule for calculation of the relaxation rate. We present more general expression for the probability of the phonon-induced transition.
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