feature: input arbitrary states #349
Description
Describe the feature you'd like
State-loading gate / function - i.e., allowing for arbitrary initializations onto a statevector.
How would this feature be used? Please describe.
Circuit().load_to(state)
Describe alternatives you've considered
The householder unitary U = I - 2 vv+ achieves this, but requires creating and applying a matrix, both of which are unnecessary and problematic for large n. The QASM implementation seems non-trivial, but I feel there should be a better way.