ryankert01 opened a new pull request, #975:
URL: https://github.com/apache/mahout/pull/975
## Problem
Calling `get_final_state_vector()` on parameterized circuits failed with
"circuits have parameters but parameter_binds is not specified" even after
`bind_parameters()` was called.
## Root Cause
`bind_parameters()` stored values in a dictionary, but
`get_final_state_vector()` never passed them to the backend simulators.
## Solution
Pass bound parameter values to each backend and apply them before simulation:
- Qiskit: use `assign_parameters()`
- Cirq: use `ParamResolver`
- Braket: use `inputs` dict
## Example
**Before (broken):**
```python
qm.apply_rx_gate(0, 'theta')
qm.bind_parameters({'theta': 0.5})
qm.get_final_state_vector() # Error!
```
**After (works):**
```python
qm.apply_rx_gate(0, 'theta')
qm.bind_parameters({'theta': 0.5})
qm.get_final_state_vector() # Returns statevector
```
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