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

Research output: Contribution to journalArticle

  • External authors:
  • Ana-Maria Ariciu
  • David H. Woen
  • Daniel N. Huh
  • Lydia Nodaraki
  • Andreas Kostopoulos
  • Conrad Goodwin
  • William J. Evans


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 times given that the ligand shell is rich in nuclear spins and non-rigid.

Bibliographical metadata

Original languageEnglish
JournalNature Communications
Early online date26 Jul 2019
Publication statusPublished - 2019

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