Addresses #283 For now, I went with the syntax `squin.load_circuit(circuit: cirq.Circuit)`. So you can e.g. do ```python q0 = cirq.NamedQubit("q0") q1 = cirq.NamedQubit("q1") circuit = cirq.Circuit( cirq.H(q1), cirq.X(q0).controlled_by(q1), cirq.Rx(rads=math.pi / 4).on(q0).controlled_by(q1), cirq.measure(q0, q1), ) main = squin.load_circuit(circuit) ``` ~~@Roger-luo @weinbe58 one open question here: cirq support arbitrary powers of gates, e.g. `cirq.H(q0)**0.123`. Should we add a `Pow` statement to squin to properly support this? I think pyqrack can also handle it, but I'll have to check again. Also, not sure what this should look like when running on hardware, but we can still error in the runtime.~~ **Edit**: turns out arbitrary powers are quite easy since we can just use the cirq helper `in_su2` to get the corresponding rotation and lower that. Also, for multi-qubit gates they usually mean "apply a controlled single qubit gate with an exponent", which again corresponds to a rotation. Thanks @kaihsin for pointing to the helper method. ## TODOs: - [x] support (arbitrary) powers of operators? - ~~[ ] Lowering of noisy circuits~~ done, except #301 - [x] Add missing gates (e.g. three-qubit controls are still missing) - [ ] Make sure the set of supported gates is complete - ~~ [ ] Optionally return the quantum register (and possibly other things) ~~ see #302 - ~~ [ ] Optionally pass in the quantum register as argument to the method ~~ see #302 - ~~[ ] Support classical control by lowering to `if` ~~ see #303

Returning and passing in the quantum register from/to a loaded cirq.Circuit #302

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