Fix: Remove interner copying from copy_empty_like()

- Revert changes to `QuantumCircuit.copy()`

crates/circuit/src/circuit_data.rs

@@ -284,8 +284,12 @@ impl CircuitData {
     ///     CircuitData: The shallow copy.
     #[pyo3(signature = (copy_instructions=true, deepcopy=false))]
     pub fn copy(&self, py: Python<'_>, copy_instructions: bool, deepcopy: bool) -> PyResult<Self> {
-        let mut res = self.copy_empty_like(py, Some(self.data().len()))?;
+        let mut res = self.copy_empty_like(py)?;
+        res.qargs_interner = self.qargs_interner.clone();
+        res.cargs_interner = self.cargs_interner.clone();
+        res.reserve(py, self.data().len());
         res.param_table.clone_from(&self.param_table);
+
         if deepcopy {
             let memo = PyDict::new(py);
             for inst in &self.data {
@@ -317,22 +321,19 @@ impl CircuitData {
         Ok(res)
     }
 
-    /// Performs an empty-like shallow copy.
+    /// Performs a copy with no instruction.
     ///
     /// Returns:
     ///     CircuitData: The shallow copy.
-    #[pyo3(signature = (reserve = None,))]
-    pub fn copy_empty_like(&self, py: Python<'_>, reserve: Option<usize>) -> PyResult<Self> {
-        let mut res = CircuitData::new(
+    pub fn copy_empty_like(&self, py: Python<'_>) -> PyResult<Self> {
+        let res = CircuitData::new(
             py,
             Some(self.qubits.cached().bind(py)),
             Some(self.clbits.cached().bind(py)),
             None,
-            reserve.unwrap_or_default(),
+            0,
             self.global_phase.clone(),
         )?;
-        res.qargs_interner = self.qargs_interner.clone();
-        res.cargs_interner = self.cargs_interner.clone();
 
         Ok(res)
     }

qiskit/circuit/quantumcircuit.py

@@ -3698,14 +3698,7 @@ def copy(self, name: str | None = None) -> typing.Self:
         Returns:
           QuantumCircuit: a deepcopy of the current circuit, with the specified name
         """
-        if not (name is None or isinstance(name, str)):
-            raise TypeError(
-                f"invalid name for a circuit: '{name}'. The name must be a string or 'None'."
-            )
-        cpy = _copy.copy(self)
-
-        _copy_metadata(self, cpy, "alike")
-
+        cpy = self.copy_empty_like(name)
         cpy._data = self._data.copy()
         return cpy