# Rapid Single Flux Quantum Computation Wikipedia article: NSA Technology Assement (2005): Mikhail Dorojevets, Paul Bunyk, D i r Zinoviev, and Konstantin Likharev . "COOL-0: Design of an RSFQ Subsystem for Petaflops Computing", June 1999, IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY SUPERCONDUCTING CIRCUIT FOR HIGH-SPEED LOOKUP TABLE Alex F. Kirichenko et al March 2011 (patent) SUNY Stony Brook Overview: , As of fall 2011, [Hypres](http://www.hypres.com/) sells an RF reciever (ADC) which can directly digitize signals up to 21 GHz, with closed loop cyrogenics.