The phase coherence relaxation times as long as T2∼830−1030±20 ns were measured for the [2Fe-2S] cluster in the intrinsic protein environment. This relaxation corresponds to a relatively long lasting coherence of the low-spin S=1/2 state. For this biological cluster, the phase coherence relaxation time was significantly affected by the nuclear hyperfine interactions of 14N with I=1. After labeling the cluster environments uniformly with the 15N isotope, T2 exceeds ∼1.1−1.4±0.1μs at the canonical orientations. This is already an order of magnitude longer than the duration of a single-spin qubit manipulation ∼10−100 ns. The transient nutation experiment corresponds to the coherent manipulation of the electron spin.
Cite
@article{arxiv.1504.00288,
title = {Electron Spin Relaxations in Biological [2Fe-2S] Cluster System},
author = {Amgalanbaatar Baldansuren},
journal= {arXiv preprint arXiv:1504.00288},
year = {2015}
}