Engineering electronic structure to prolong relaxation times in molecular qubits by minimising orbital angular momentum

Ana-Maria Ariciu, David H. Woen, Daniel N. Huh, Lydia E. Nodaraki, Andreas K. Kostopoulos, Conrad A. P. Goodwin, Nicholas F. Chilton, Eric J. L. McInnes, Richard E. P. Winpenny (), William J. Evans () and Floriana Tuna ()
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Ana-Maria Ariciu: The University of Manchester
David H. Woen: University of California
Daniel N. Huh: University of California
Lydia E. Nodaraki: The University of Manchester
Andreas K. Kostopoulos: The University of Manchester
Conrad A. P. Goodwin: The University of Manchester
Nicholas F. Chilton: The University of Manchester
Eric J. L. McInnes: The University of Manchester
Richard E. P. Winpenny: The University of Manchester
William J. Evans: University of California
Floriana Tuna: The University of Manchester

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract The proposal that paramagnetic transition metal complexes could be used as qubits for quantum information processing (QIP) requires that the molecules retain the spin information for a sufficient length of time to allow computation and error correction. Therefore, understanding how the electron spin-lattice relaxation time (T1) and phase memory time (Tm) relate to structure is important. Previous studies have focused on the ligand shell surrounding the paramagnetic centre, seeking to increase rigidity or remove elements with nuclear spins or both. Here we have studied a family of early 3d or 4f metals in the +2 oxidation states where the ground state is effectively a 2S state. This leads to a highly isotropic spin and hence makes the putative qubit insensitive to its environment. We have studied how this influences T1 and Tm and show unusually long relaxation times given that the ligand shell is rich in nuclear spins and non-rigid.

Date: 2019
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DOI: 10.1038/s41467-019-11309-3

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