4K Rapid Single Flux Quantum (RSFQ) AI Core Model

Underwrite 4.2 Kelvin Niobium Josephson junction circuits switching quantized magnetic flux pulses at 100 GHz clock frequencies with < 1 atto-Joule per bit dissipation (accelerating large-scale AI graph neural networks at ultra-high clock rates without thermal throttling). Model cryogenic compute cluster deployments ($145M/cluster), and 15-yr IRR.