Multiple quantum coherences from hyperfine transitions in a vanadium(IV) complex

Joseph M. Zadrozny, Jens Niklas, Oleg G. Poluektov, Danna E. Freedman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

85 Scopus citations


We report a vanadium complex in a nuclear-spin free ligand field that displays two key properties for an ideal candidate qubit system: long coherence times that persist at high temperature, T2 = 1.2s at 80 K, and the observation of quantum coherences from multiple transitions. The electron paramagnetic resonance (EPR) spectrum of the complex [V(C8S8)3]2- displays multiple transitions arising from a manifold of states produced by the hyperfine coupling of the S = 1/2 electron spin and I = 7/2 nuclear spin. Transient nutation experiments reveal Rabi oscillations for multiple transitions. These observations suggest that each pair of hyperfine levels hosted within [V(C8S8)3]2- are candidate qubits. The realization of multiple quantum coherences within a transition metal complex illustrates an emerging method of developing scalability and addressability in electron spin qubits. This study presents a rare molecular demonstration of multiple Rabi oscillations originating from separate transitions. These results extend observations of multiple quantum coherences from prior reports in solid-state compounds to the new realm of highly modifiable coordination compounds.

Original languageEnglish (US)
Pages (from-to)15841-15844
Number of pages4
JournalJournal of the American Chemical Society
Issue number45
StatePublished - Nov 12 2014

ASJC Scopus subject areas

  • General Chemistry
  • Biochemistry
  • Catalysis
  • Colloid and Surface Chemistry


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