Hajime Wakai is a sound artist at Nintendo. He has worked on many of Ninten… Read Full Bio ↴Hajime Wakai is a sound artist at Nintendo. He has worked on many of Nintendo game soundtracks. He is the composer of the majority of the Star Fox 64 Original Soundtrack.
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Fortuna ⊕ Sector Z
若井淑 Lyrics
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The lyrics are frequently found in the comments by searching or by filtering for lyric videos
The lyrics are frequently found in the comments by searching or by filtering for lyric videos
MrMcsoftware
I'm not sure I can help you too much on this, unfortunately. I didn't come up with the AND implementation (except the modifications to work on the topology of the quantum computer used). But, I do know that some of the seemingly useless gates are there to make the AND gate reversible (all quantum gates have to be reversible, not sure why other than convenience. My guess as to why, is that with all the uncertainty of quantum computing, you have to have some way of keeping a safety line (so to speak) to a known starting point. If a gate was non-reversible, you would lose that safety line (I think)). Also, remember that a Toffoli gate is also a 2-input XOR gate, so maybe seemingly useless gates are to make the XOR part.
At any rate, here's a forum post that had the AND gate (I think there were other forum posts that had this implementation, so I don't know who the original creator of it is):
https://quantumexperience.ng.bluemix.net/qx/community/question?questionId=539dcb4b4e94ce763d3c391086ae072f
(you might have to be logged in to view forum)
And here's IBM's User Manual entry on Toffoli gates:
https://quantumexperience.ng.bluemix.net/qx/tutorial?sectionId=full-user-guide&page=004-Quantum_Algorithms~2F061-Basic_Circuit_Identities_and_Larger_Circuits
And, of course, the two pages don't quite match (even when ignoring the qubit swaps necessary for the particular topology). Which even more adds to the confusion.
And, beware (or be aware), I added a warning to this video's description recently - after I created this video, IBM changed qx4's topology slightly, so this gate implementation (and the ones in the above links) might have to be changed. I think I ran mine on qx4, not sure.
BTW, one advantage of using QISKit (and maybe even just QASM) rather than composer, is that you don't have to worry about coding for a specific topology, the compiler will automatically put in the necessary CNOT direction changes for the quantum computer you request.
Hope this all helps (and doesn't make things worse)
MrMcsoftware
Just to let everyone know, IBM has changed their website and github repositories quite a bit since I made this video. You can still do everything I show, but it might take a bit of searching and/or adjusting. Also, they have more quantum computers to choose from (and topologies may be different).
Reon Fourie
I like that AND gate states that you simulated using quntum gates (the toffoli gate I believe). However I did find that there are some useless t and tdg gates there. Can you maybe explain how that AND simulation that u did works? I'm not quite clear on why u did what u did there. But I'm really interested in how you came up with it
MrMcsoftware
I'm not sure I can help you too much on this, unfortunately. I didn't come up with the AND implementation (except the modifications to work on the topology of the quantum computer used). But, I do know that some of the seemingly useless gates are there to make the AND gate reversible (all quantum gates have to be reversible, not sure why other than convenience. My guess as to why, is that with all the uncertainty of quantum computing, you have to have some way of keeping a safety line (so to speak) to a known starting point. If a gate was non-reversible, you would lose that safety line (I think)). Also, remember that a Toffoli gate is also a 2-input XOR gate, so maybe seemingly useless gates are to make the XOR part.
At any rate, here's a forum post that had the AND gate (I think there were other forum posts that had this implementation, so I don't know who the original creator of it is):
https://quantumexperience.ng.bluemix.net/qx/community/question?questionId=539dcb4b4e94ce763d3c391086ae072f
(you might have to be logged in to view forum)
And here's IBM's User Manual entry on Toffoli gates:
https://quantumexperience.ng.bluemix.net/qx/tutorial?sectionId=full-user-guide&page=004-Quantum_Algorithms~2F061-Basic_Circuit_Identities_and_Larger_Circuits
And, of course, the two pages don't quite match (even when ignoring the qubit swaps necessary for the particular topology). Which even more adds to the confusion.
And, beware (or be aware), I added a warning to this video's description recently - after I created this video, IBM changed qx4's topology slightly, so this gate implementation (and the ones in the above links) might have to be changed. I think I ran mine on qx4, not sure.
BTW, one advantage of using QISKit (and maybe even just QASM) rather than composer, is that you don't have to worry about coding for a specific topology, the compiler will automatically put in the necessary CNOT direction changes for the quantum computer you request.
Hope this all helps (and doesn't make things worse)
ARBB
Good explanation of quantum gates. Most are either for computer scientists exclusively, or just the physics.
MrMcsoftware
@Artur Renato B.B Thanks! I think I tend to teach the way I like to learn (just tell me what I need to know, I don't need to know how it was derived, theory, why, etc.) There are disadvantages with doing things that way, but I think it's more likely to result in getting things done. One can always look into the subject more if one wants to know how things are derived, etc. But for the topic of quantum computing, a little more explanation was warranted. So it appears I struck the right balance.
ARBB
@MrMcsoftware a very practical kind of guy? I like your style. I personally prefer the theoretical approach myself, but since I wanted a connective explanation, this suited my needs a lot, so thanks for the content
MrMcsoftware
@Artur Renato B.B I guess practical would be accurate. For example, in math classes in school (high school and college) I would often do the next homework assignment in class while still somewhat paying attention to the teacher. It was their fault in a way - it shouldn't take 25 homework problems to determine if you know the topic of the day - at some point it just becomes torturous busy-work. Of course math tends to lend itself to practicality. Science would often be more theoretical.
Runaan
Wwwwait what... Quantum Computers already exist :o i thought they were just prototyping with them! holy shit
I didnt really understand what was going on but it looks insane! my mind is exploding right now xO
i cant find words to express this insanity
MrMcsoftware
It surprised me when I found out IBM had been allowing free access to their quantum computers for the past year or two. Where have I been? :-) I saw an interesting list of quantum processors on Wikipedia - Google is also working on quantum.
Supahfly uk
We are truly living in the future.