Electron-Spin Relaxation Measurements of Biological [2Fe-2S] Cluster System in View of Electron Spin Quantum Bits


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At 20 K, as long as \(T_m\sim 800-1000\) ns were measured for the [2Fe-2S] cluster in its intrinsic protein environment. Such relaxations are a relatively long coherence time for the low-spin \(S=1/2\) system. For this biological cluster, the phase memory time was found significantly affected by the nuclear hyperfine interactions of \(^{14}\)N with \(I=1\). When labeling the surrounding ligands with the \(^{15}\)N isotope uniformly, \(T_m\) are enhanced between \({\sim }1.1-1.4~\upmu\)s at the canonical orientations. This is already an order of magnitude longer than the duration of a single-spin qubit manipulation \({\sim }10-100\) ns. While \(T_1\) are of the order of \({\sim }130\)\(\upmu\)s at the canonical orientations, the transient nutation experiments reflect on the coherent manipulation of the electron spin.

Sobre autores

Amgalanbaatar Baldansuren

School of Chemistry, EPSRC National EPR Facility, Photon Science Institute, The University of Manchester; Department of Veterinary Clinical Medicine, The Illinois EPR Research Center, University of Illinois at Urbana-Champaign

Autor responsável pela correspondência
Email: amgalanbaatar.baldansuren@manchester.ac.uk
ORCID ID: 0000-0001-8767-3731
Reino Unido da Grã-Bretanha e Irlanda do Norte, Oxford Road, Manchester, M13 9PL; Urbana, IL, 61801

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