We study the role of qubit dephasing in cooling a mechanical resonator by quantum back-action. With a superconducting flux qubit as a specific example, we show that ground-state cooling of a mechanical resonator can only be realized if the qubit dephasing rate is sufficiently low.
@article{arxiv.0812.0261,
title = {Cooling a micro-mechanical resonator by quantum back-action from a noisy qubit},
author = {Ying-Dan Wang and Yong Li and Fei Xue and C. Bruder and K. Semba},
journal= {arXiv preprint arXiv:0812.0261},
year = {2015}
}