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Ookami: An A64FX Computing Resource

https://doi.org/10.1088/1742-6596/2742/1/012019

Calder, A C; Siegmann, E; Feldman, C; Chheda, S; Smolarski, D C; Swesty, F D; Curtis, A; Dey, J; Carlson, D; Michalowicz, B; et al (April 2024, Journal of Physics: Conference Series)

We present a look at Ookami, a project providing community access to a testbed supercomputer with the ARM-based A64FX processors developed by a collaboration between RIKEN and Fujitsu and deployed in the Japanese supercomputer Fugaku. We provide an overview of the project and details of the hardware, and describe the user base and education/training program. We present highlights from previous performance studies of two astrophysical simulation codes and present a strong scaling study of a full 3D supernova simulation as an example of the machine’s capability.
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Annealing reduces ${Si}_{3} N_{4}$ microwave-frequency dielectric loss in superconducting resonators

https://doi.org/10.1103/PhysRevApplied.21.054044

Mittal, S.; Adachi, K.; Frattini, NE; Urmey, MD; Lin, S-X; Emser, AL; Metzger, C.; Talamo, LG; Dickson, S.; Carlson, D.; et al (May 2024, Physical Review Applied)
Photonic crystal resonators for inverse-designed multi-dimensional optical interconnects

https://doi.org/10.1364/OL.461272

Shirpurkar, C.; Zang, J.; Yang, K_Y; Carlson, D.; Yu, S_P; Lucas, E.; Pericherla, S_V; Yang, J.; Guidry, M.; Lukin, D.; et al (June 2022, Optics Letters)

We experimentally demonstrate a 400 Gbit/s optical communication link utilizing wavelength-division multiplexing and mode-division multiplexing for a total of 40 channels. This link utilizes a novel, to the best of our knowledge, 400 GHz frequency comb source based on a chip-scale photonic crystal resonator. Silicon-on-insulator photonic inverse-designed 4 × 4 mode-division multiplexer structures enable a fourfold increase in data capacity. We show less than −10 dBm of optical receiver power for error-free data transmission in 34 out of a total of 40 channels using a PRBS31 pattern.
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