> efficient quantum algorithms can be reimplemented with electronic circuits, You can emulate a quantum computer with a classical one, but it takes exponential

> efficient quantum algorithms can be reimplemented with electronic circuits, You can emulate a quantum computer with a classical one, but it takes exponential time. If you could emulate them efficiently, quantum computers would just be another Turing machine, with all the limitations we already know. I think this is the whole point of quantum computers, they are different from what we already have.