Spectral Addressability in a Modular Two Qubit System

Stephen Von Kugelgen, Matthew D. Krzyaniak, Mingqiang Gu, Danilo Puggioni, James M. Rondinelli, Michael R. Wasielewski*, Danna E Freedman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


The combination of structural precision and reproducibility of synthetic chemistry is perfectly suited for the creation of chemical qubits, the core units of a quantum information science (QIS) system. By exploiting the atomistic control inherent to synthetic chemistry, we address a fundamental question of how the spin-spin distance between two qubits impacts electronic spin coherence. To achieve this goal, we designed a series of molecules featuring two spectrally distinct qubits, an early transition metal, Ti3+, and a late transition metal, Cu2+ with increasing separation between the two metals. Crucially, we also synthesized the monometallic congeners to serve as controls. The spectral separation between the two metals enables us to probe each metal individually in the bimetallic species and compare it with the monometallic control samples. Across a range of 1.2-2.5 nm, we find that electron spins have a negligible effect on coherence times, a finding we attribute to the distinct resonance frequencies. Coherence times are governed, instead, by the distance to nuclear spins on the other qubit's ligand framework. This finding offers guidance for the design of spectrally addressable molecular qubits.

Original languageEnglish (US)
Pages (from-to)8069-8077
Number of pages9
JournalJournal of the American Chemical Society
Issue number21
StatePublished - Jun 2 2021

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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