Integrated diamond photonics presents one of the most promising platforms for solid-state quantum computing due to diamond’s high refractive index, large electronic bandgap and its large number of defects with highly stable fluorescence of single photons and coherent electron spin control like the silicon vacancy. This work presents the design, simulation, fabrication and measurement of free-standing diamond photonic crystal cavities from bulk single-crystal diamond substrate for emission enhancement of the SiV-. Simulation yields Q-factors of up to 2.4 million and normalised mode volumes down to 0.52. Confocal measurements of the fabricated devices yield Q-factors of up to 1800 near the SiV- zero phonon line. These diamond resonators offer a promising approach to realizing large-scale diamond quantum registers.
In this experimental study, we delve into the potential implementation of logic operations using the interference of propagating spin waves within a device comprising intersecting yttrium iron garnet waveguides with submicrometer width. Notably, we extend our exploration to incorporate phase-change materials as memory elements atop these waveguides. Our results underscore critical considerations in the design of magnonic nanodevices operating with short-wavelength spin waves, offering valuable insights for optimizing their performance in practical applications.
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