2017年8月3日 · Fredkin gates preserve the total number of ON bits. Toffoli gates don't. Because of that, it's impossible to implement Toffoli gates with Fredkin gates without some source/dump of ON bits. See the paper 'The Classification of Reversible Bit Operations' by Scott Aaronson et al.

We first explore some of the features of the Fredkin gate. Generally, we write the gate as. For particular choices of ancilla, we find. FANOUT/NOT. AND. In terms of our desired output, we see that the first two inputs are trivially mapped (aside from any possibly FANOUTs needed). The third output requires combining xy with z:

2019年9月21日 · Help making a Fredkin gate I want to be able to make a compact version of a Fredkin gate (binary version of course) but so far I’ve only been able to make an extremely large and bulky contraption.

2019年12月22日 · So I've been researching Fredkin gates and reversable computing, but something about Fredkin gates has ...

2016年3月28日 · 145 votes, 17 comments. 19M subscribers in the Futurology community. A subreddit devoted to the field of Future(s) Studies and evidence-based…

2019年12月23日 · So I've been researching reversable computing, but something about Fredkin gates has started irking me. The scientific publications on Fredkin gates, like this one , and books I've read, namely Quest for the Quantum Computer by Julian Brown, suggest that the Fredkin gate swaps its two non-control inputs when it's control bit is 1, but the ...

2022年9月18日 · 1.3K subscribers in the TuringComplete community. Fan community of the game Turing Complete

2017年12月28日 · 4.3K subscribers in the opus_magnum community. The official subreddit for Opus Magnum by Zachtronics.

2020年7月30日 · 8.9K subscribers in the shapezio community. This is the subreddit for the Steam Game shapez (aka shapez.io) as well as discussions about Shapez 2…

2020年7月31日 · The conditional swap or Fredkin gate is often used in quantum mechanical systems where individual particles cannot be created or destroyed, as any system built on it preserves all inputs. The gate is universal as all logic gates may be implemented via it.