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Constructing clock-transition-based two-qubit gates from dimers of molecular nanomagnets

https://doi.org/10.1103/PhysRevResearch.2.032037

Collett, Charles A.; Santini, Paolo; Carretta, Stefano; Friedman, Jonathan R. (August 2020, Physical Review Research)
null (Ed.)
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Direct spectroscopic observation of Berry-phase interference in the ${Ni}_{4}$ single-molecule magnet

https://doi.org/10.1103/PhysRevB.102.224428

Sheehan, Brendan C.; Kwark, Robert; Collett, Charles A.; Costa, Thomaz A.; Cassaro, Rafael A.; Friedman, Jonathan R. (December 2020, Physical Review B)
null (Ed.)
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A Clock Transition in the Cr7Mn Molecular Nanomagnet

https://doi.org/10.3390/magnetochemistry5010004

Collett, Charles; Ellers, Kai-Isaak; Russo, Nicholas; Kittilstved, Kevin; Timco, Grigore; Winpenny, Richard; Friedman, Jonathan (March 2019, Magnetochemistry)

A viable qubit must have a long coherence time T 2 . In molecular nanomagnets, T 2 is often limited at low temperatures by the presence of dipole and hyperfine interactions, which are often mitigated through sample dilution, chemical engineering and isotope substitution in synthesis. Atomic-clock transitions offer another route to reducing decoherence from environmental fields by reducing the effective susceptibility of the working transition to field fluctuations. The Cr7Mn molecular nanomagnet, a heterometallic ring, features a clock transition at zero field. Both continuous-wave and spin-echo electron-spin resonance experiments on Cr7Mn samples, diluted via co-crystallization, show evidence of the effects of the clock transition with a maximum T 2 ∼ 390 ns at 1.8 K. We discuss improvements to the experiment that may increase T 2 further.
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