Fix num_identifiers.

kevinhartman · kevinhartman · commit 2223d12dc513 · 2025-03-05T20:05:23.000-05:00
diff --git a/qiskit/qpy/binary_io/circuits.py b/qiskit/qpy/binary_io/circuits.py
@@ -1228,7 +1228,7 @@ def write_circuit(
         metadata_size=metadata_size,
         num_registers=num_registers,
         num_instructions=num_instructions,
-        num_vars=circuit.num_vars,
+        num_vars=circuit.num_identifiers,
     )
     header = struct.pack(formats.CIRCUIT_HEADER_V12_PACK, *header_raw)
     file_obj.write(header)

Original file line number	Diff line number	Diff line change
`@@ -1228,7 +1228,7 @@ def write_circuit(`
`1228`	`1228`	`metadata_size=metadata_size,`
`1229`	`1229`	`num_registers=num_registers,`
`1230`	`1230`	`num_instructions=num_instructions,`
`1231`		`- num_vars=circuit.num_vars,`
	`1231`	`+ num_vars=circuit.num_identifiers,`
`1232`	`1232`	`)`
`1233`	`1233`	`header = struct.pack(formats.CIRCUIT_HEADER_V12_PACK, *header_raw)`
`1234`	`1234`	`file_obj.write(header)`