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Add qubits and clbits to dag in DAGCircuit::with_capacity #13090

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Add qubits and clbits to dag in DAGCircuit::with_capacity #13090

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21 changes: 19 additions & 2 deletions crates/circuit/src/dag_circuit.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -6195,7 +6195,7 @@ impl DAGCircuit {
num_vars * 2 + // One input + output node per variable
num_ops;

Ok(Self {
let mut new_dag = Self {
name: None,
metadata: Some(PyDict::new_bound(py).unbind().into()),
calibrations: HashMap::default(),
Expand Down Expand Up @@ -6223,7 +6223,24 @@ impl DAGCircuit {
PySet::empty_bound(py)?.unbind(),
PySet::empty_bound(py)?.unbind(),
],
})
};

if num_qubits > 0 {
let qubit_cls = imports::QUBIT.get_bound(py);
for _i in 0..num_qubits {
let bit = qubit_cls.call0()?;
new_dag.add_qubit_unchecked(py, &bit)?;
}
}

if num_clbits > 0 {
let clbit_cls = imports::CLBIT.get_bound(py);
for _i in 0..num_clbits {
let bit = clbit_cls.call0()?;
new_dag.add_clbit_unchecked(py, &bit)?;
}
}
Ok(new_dag)
}

/// Get qargs from an intern index
Expand Down