Universal quantum gates Updated 2025-07-16
Just like as for classic gates, we would like to be able to select quantum computer physical implementations that can represent one or a few gates that can be used to create any quantum circuit.
Unfortunately, in the case of quantum circuits this is obviously impossible, since the space of N x N unitary matrices is infinite and continuous.
Therefore, when we say that certain gates form a "set of universal quantum gates", we actually mean that "any unitary matrix can be approximated to arbitrary precision with enough of these gates".
Or if you like fancy Mathy words, you can say that the subgroup of the unitary group generated by our basic gate set is a dense subset of the unitary group.
Justin Helps Updated 2025-07-16
Creator of Primer
youtube.fandom.com/wiki/Primer gives real identity:
Feels exactly the background you'd expect: disilusioned by the educational system, and working to make education better! Great guy! Reminds Ciro Santilli of himself a bit.
Personality Updated 2025-07-16
3D game Updated 2025-07-16
Ettore Majorana Updated 2025-07-16
Ciro's theory for his disappearance is that he became a Majorana fermion and flew off into the infinite.
Figure 1.
Ettore Majorana
. Source. What a nerd!
Fetish Updated 2025-07-16
Particle physics bibliography Updated 2025-07-16
Some light YouTube channels, good for the first view, but which don't go into enough detail to truly show the subject's beauty:
Proteomics Updated 2025-07-16
The study of the proteome.
One problem popped up about one year after having bought the blinds in 2019: the blind won't stay still except at the most closed position. Anywhere above it started to slowly go up by itself.
It is not super serious as it covers the two main use cases: full closed and fully open, but it is a bit worrying.
Also, we've had some mold grow on the window, so it is something to look out for, and add some mold spray as it comes up. The fact that the window is dark makes the mold harder to spot.

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