When I put each single qubit within a quantum register using Hadamard gates in superposition, how does it work that the whole register quantum-state is in superposition?
On the math-level the register-state is the tensor-product of the single qubit-states; but how is this realized on the physical level? How do the qubits interact? Looking on entanglement I take a CNOT and I know this gate is realized on the physical level. But what about the tensor-product on the physical level?