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> Qubits represent 0 and 1 using quantum phenomenon like the nuclear spin direction of individual atoms. Not trying to be that guy but this is so wrong/mislea
by dvt 9y ago
> Qubits represent 0 and 1 using quantum phenomenon like the nuclear spin direction of individual atoms.
Not trying to be that guy but this is so wrong/misleading, it hurts (and I'm not even a physicist!). Spin isn't a "direction" and atoms don't "spin" -- well, they might, but the quantum kind of spin has nothing to do with angular momentum.
- gibybo 9y agoFrom https://en.wikipedia.org/wiki/Spin_(physics) https://en.wikipedia.org/wiki/Spin_(physics): >In quantum mechanics and particle physics, spin is an intrinsic form of angular momentum carried by elementary particles And >In some ways, spin is like a vector quantity; it has a definite magnitude, and it has a "direction" (but quantization makes this "direction" different from the direction of an ordinary vector).
- zimablue 9y agoNot a physicist but I did study a degree in it. Spin is absolutely a direction and absolutely related to angular momentum, since it's basically the angular momentum that you get when all the angular momentum we understand is removed. There's a reason it's called spin! I think what you're trying to get at is that it can't be understood in the traditional context of an object spinning, but the way that you're saying it is wrong.
- likelynew 9y agoNo, ELECTRON spin is not exactly a direction, as in 3D vector. In every direction, it can be +1 or -1. It follows different transformation than a vector(wigner matrix for j=1/2 and 1). Expressions like direction |z> and |x> are not independent in this case. Photon spin is actually a vector, as with all spin 1 particle.