Synchronization dynamics on the picosecond timescale in coupled   Josephson junction neurons
  Conventional digital computation is rapidly approaching physical limits for speed and energy dissipation. Here we fabricate and test a simple neuromorphic circuit that models neuronal somas, axons and synapses with superconducting Josephson junctions. The circuit models two mutually coupled excitatory neurons. In some regions of parameter space the neurons are desynchronized. In others, the Josephson neurons synchronize in one of two states, in-phase or anti-phase. An experimental alteration of the delay and strength of the connecting synapses can toggle the system back and forth in a phase-flip bifurcation. Firing synchronization states are calculated >70,000 times faster than conventional digital approaches. With their speed and low energy dissipation (10-17 Joules/spike), this set of proof-of- concept experiments establishes Josephson junction neurons as a viable approach for improvements in neuronal computation as well as applications in neuromorphic computing. 
Ken Segall, Matthew LeGro, Steven Kaplan, Oleksiy Svitelskiy, Shreeya   Khadka, Patrick Crotty, Daniel Schult
q-bio.NC cond-mat.dis-nn cs.ET physics.bio-ph