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feat: add OpenQASM 3 export support to qiskit-cpp (#146) #157

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feat: add OpenQASM 3 export support to qiskit-cpp (#146) #157

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18 changes: 18 additions & 0 deletions releasenotes/notes/qasm3-exporter-parameter-146.yaml
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---
features:
- |
Add OpenQASM 3 export support for parameterized circuits with explicit
`input float[64]` declarations.

`QuantumCircuit::to_qasm3()` and `Qiskit::qasm3::dumps(circuit)` use
`QuantumCircuit::parameter_symbols()` to emit original parameter symbol
names by default. `Qiskit::qasm3::dumps(circuit, parameter_names)` remains
available for callers that need to provide names explicitly. Explicit
parameter names must be valid OpenQASM identifiers and must not conflict
with reserved OpenQASM or standard-gate identifiers.

`QuantumCircuit::parameter_symbols()` currently derives names from
instruction parameter expression strings and cross-checks the recovered
count against Qiskit C. Until Qiskit C exposes canonical parameter names
or UUIDs to C++, circuits cannot contain distinct `Parameter` objects with
the same symbol name.
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