Why not just simulate quantum computers?

Quantum computers run on quantum mechanics, which can be modeled off on a quantum computer? All the benefits and none of the drawbacks. Tomorrow's technology, today!

Because quantum entanglement can not been reliably performed yet, and current technology only allows a few qubits to become entangled, not enough to perform at the theoretical speed that it could. However quantum tunelling has been proved, I remember reading in an article a while back, a CPU chip that successfully implemented it, but QT is no way near as fast for transmission as entanglement.

I have doubts about quantum entanglement though. Thing is these particles are extremely sensitive, even small changes in the relative environment can offset its state, hence produce erroneous results. On top of this I hate reading all these FTL transmission BS. No information travels in quantum entanglement, it's such BS. It's simply entangled particles (i.e. parent photons being split into two daughter photons), and the daughter photons simply inherit the properties of the parent photon. Hence when the state is analysed of course both daughter photons will produce same result, theoretically these daughter photons can be galaxies apart, but as stated previously they are highly sensitive to surrounding conditions. Thus the state will easily be changed, and the ``entanglement'; broken no longer producing the symmetrical results.

Why I even bothered to post that here instead of /sci/, maybe you will learn something.