qasm3 returns wrong results with pauli evolution gate #11954
Description
When trying to turn this circuit into a qasm3 :
from qiskit.circuit import QuantumCircuit, ParameterVector
from qiskit.circuit.library import PauliEvolutionGate
from qiskit.quantum_info import SparsePauliOp
from qiskit.qasm3 import dumps, loads, dump, load
t = ParameterVector("t", 3)
X, Y, Z = SparsePauliOp("X"), SparsePauliOp("Y"), SparsePauliOp("Z")
op1, op2, op3 = (X^X), (Y^Y), (Z^Z)
evo1 = PauliEvolutionGate(op1, time=t[0])
evo2 = PauliEvolutionGate(op2, time=t[1])
evo3 = PauliEvolutionGate(op3, time=t[2])
dec0 = QuantumCircuit(2)
dec0.append(evo1, range(2))
dec0.append(evo2, range(2))
dec0.append(evo3, range(2))
dec0.count_ops() #returns OrderedDict([('PauliEvolution', 3)])
after dumping into a qasm3, we would expect the qasm to have 3 different gates for the XX, YY, ZZ but it only looks into the first Pauli evolution gate and repeats it 3 times :
q0 = dumps(dec0)
print(q0)
#returns
OPENQASM 3.0;
include "stdgates.inc";
input float[64] _t_0_;
input float[64] _t_1_;
input float[64] _t_2_;
gate rxx_4948547280(_t_0_) _gate_q_0, _gate_q_1 {
h _gate_q_0;
h _gate_q_1;
cx _gate_q_0, _gate_q_1;
rz(2.0*_t_0_) _gate_q_1;
cx _gate_q_0, _gate_q_1;
h _gate_q_1;
h _gate_q_0;
}
gate PauliEvolution(_t_0_) _gate_q_0, _gate_q_1 {
rxx_4948547280(2.0*_t_0_) _gate_q_0, _gate_q_1;
}
qubit[2] q;
PauliEvolution(_t_0_) q[0], q[1];
PauliEvolution(_t_1_) q[0], q[1];
PauliEvolution(_t_2_) q[0], q[1];