Duellmann heads nuclear chemistry at JGU (TRIGA reactor site) with joint appointments at GSI and the Helmholtz Institute Mainz, working on the production, chemical separation and characterization of the heaviest elements. For this search the relevant thread is 229Th: his group supplies and prepares the isomeric thorium samples and molecular thorium ions that Wendt's laser spectroscopy and Schmidt-Kaler's ion traps interrogate en route to a nuclear clock, and he is part of the broader radioactive-molecule programme aimed at symmetry-violation searches. Relative to the established NV-ensemble quantum-sensing playbook (DEER, nanoscale NMR, T1 relaxometry at pT/sqrt(Hz) ensemble sensitivity), the pivot is toward the next frontier of frequency metrology, where the 'sensor' is a nucleus rather than an electron shell -- an unusually good chemistry/physics interface for a postdoc.

Jamieson's group built the counted single-ion implantation capability that underpins every donor spin qubit made at UNSW and Melbourne: individual P, Sb or Bi ions are implanted into silicon through a nanoscale aperture while on-chip detector electrodes register the electron-hole pairs from each ion stop event, so the number and position of dopants is known rather than assumed. Recent directions extend this to high-atomic-number donors for nuclear-spin qudits, to colour-centre creation in diamond and silicon carbide by counted implantation, and to characterising the damage and charge environment those ions leave behind. The work is fabrication-forward but its scientific content is single-particle detection metrology. Positioned against the established body of NV-ensemble quantum sensing work — DEER, nanoscale NMR and T1 relaxometry protocols operating at pT/sqrt(Hz) field sensitivity — his contribution is upstream: the deterministic creation and validation of the very spin defects whose ensembles are later interrogated by DEER and nanoscale NMR at pT/sqrt(Hz).