Long Coherence Times in Nuclear Spin-Free Vanadyl Qubits

Chung Jui Yu, Michael J. Graham, Joseph M. Zadrozny, Jens Niklas, Matthew D. Krzyaniak, Michael R Wasielewski, Oleg G. Poluektov, Danna E. Freedman

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Quantum information processing (QIP) offers the potential to create new frontiers in fields ranging from quantum biology to cryptography. Two key figures of merit for electronic spin qubits, the smallest units of QIP, are the coherence time (T2), the lifetime of the qubit, and the spin-lattice relaxation time (T1), the thermally defined upper limit of T2. To achieve QIP, processable qubits with long coherence times are required. Recent studies on (Ph4P-d20)2[V(C8S8)3], a vanadium-based qubit, demonstrate that millisecond T2 times are achievable in transition metal complexes with nuclear spin-free environments. Applying these principles to vanadyl complexes offers a route to combine the previously established surface compatibility of the flatter vanadyl structures with a long T2. Toward those ends, we investigated a series of four qubits, (Ph4P)2[VO(C8S8)2] (1), (Ph4P)2[VO(β-C3S5)2] (2), (Ph4P)2[VO(α-C3S5)2] (3), and (Ph4P)2[VO(C3S4O)2] (4), by pulsed electron paramagnetic resonance (EPR) spectroscopy and compared the performance of these species with our recently reported set of vanadium tris(dithiolene) complexes. Crucially we demonstrate that solutions of 1-4 in SO2, a uniquely polar nuclear spin-free solvent, reveal T2 values of up to 152(6) μs, comparable to the best molecular qubit candidates. Upon transitioning to vanadyl species from the tris(dithiolene) analogues, we observe a remarkable order of magnitude increase in T1, attributed to stronger solute-solvent interactions with the polar vanadium-oxo moiety. Simultaneously, we detect a small decrease in T2 for the vanadyl analogues relative to the tris(dithiolene) complexes. We attribute this decrease to the absence of one nuclear spin-free ligand, which served to shield the vanadium centers against solvent nuclear spins. Our results highlight new design principles for long T1 and T2 times by demonstrating the efficacy of ligand-based tuning of solute-solvent interactions.

Original languageEnglish
Pages (from-to)14678-14685
Number of pages8
JournalJournal of the American Chemical Society
Volume138
Issue number44
DOIs
Publication statusPublished - Nov 9 2016

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Vanadium
Vanadates
Automatic Data Processing
Ligands
Spin-lattice relaxation
Coordination Complexes
Metal complexes
Relaxation time
Cryptography
Transition metals
Paramagnetic resonance
Electron Spin Resonance Spectroscopy
Tuning
Spectroscopy
Spectrum Analysis

ASJC Scopus subject areas

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

Cite this

Yu, C. J., Graham, M. J., Zadrozny, J. M., Niklas, J., Krzyaniak, M. D., Wasielewski, M. R., ... Freedman, D. E. (2016). Long Coherence Times in Nuclear Spin-Free Vanadyl Qubits. Journal of the American Chemical Society, 138(44), 14678-14685. https://doi.org/10.1021/jacs.6b08467

Long Coherence Times in Nuclear Spin-Free Vanadyl Qubits. / Yu, Chung Jui; Graham, Michael J.; Zadrozny, Joseph M.; Niklas, Jens; Krzyaniak, Matthew D.; Wasielewski, Michael R; Poluektov, Oleg G.; Freedman, Danna E.

In: Journal of the American Chemical Society, Vol. 138, No. 44, 09.11.2016, p. 14678-14685.

Research output: Contribution to journalArticle

Yu, CJ, Graham, MJ, Zadrozny, JM, Niklas, J, Krzyaniak, MD, Wasielewski, MR, Poluektov, OG & Freedman, DE 2016, 'Long Coherence Times in Nuclear Spin-Free Vanadyl Qubits', Journal of the American Chemical Society, vol. 138, no. 44, pp. 14678-14685. https://doi.org/10.1021/jacs.6b08467
Yu, Chung Jui ; Graham, Michael J. ; Zadrozny, Joseph M. ; Niklas, Jens ; Krzyaniak, Matthew D. ; Wasielewski, Michael R ; Poluektov, Oleg G. ; Freedman, Danna E. / Long Coherence Times in Nuclear Spin-Free Vanadyl Qubits. In: Journal of the American Chemical Society. 2016 ; Vol. 138, No. 44. pp. 14678-14685.
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