Reversible Logic Synthesis Benchmarks Page

Function hwb20 is the hidden weighted bit function with parameter N=20.
 

Picture	Machine-readable version	Model	Garbage	Gate count	Quantum cost	Author(s)	Date
N/A (too large)	here	GT&GF	5	159	1,421	I. L. Markov, D. Maslov	October, 2009

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* - the number is shown to be minimal