In a recent Letter [Phys. Rev. Lett. {\bf 95}, 080502 (2005)], an interesting scheme was proposed to implement a type of conditional quantum phase gates with built-in fault-tolerant feature via adiabatic evolution of dark eigenstates. In this comment we elaborate the geometric nature of the gate scheme and clarify that it still belongs to a class of conventional geometric quantum computation.
@article{arxiv.quant-ph/0509150,
title = {Geometric nature in adiabatic evolution of dark eigenstates},
author = {Shi-Liang Zhu and Z. D. Wang},
journal= {arXiv preprint arXiv:quant-ph/0509150},
year = {2007}
}