New ideas have resurrected this concept using RSFQ -- Rapid Single Flux Quantum -- approach |
This naturally gives a bit which is 0 or 1 (or in fact n units!) |
This gives interesting circuits of similar structure to CMOS systems but with a clock speed of order 100-300GHz -- factor of 100 better than CMOS which will asymptote at around 1 GHz (= one nanosecond cycle time) |