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QASM2 Circuit Optimization with PyZX: Handling 'if' and 'reset' Errors
Hello everyone,
I’m currently working on circuit optimization using the pyzx library. My goal is to take a QASM2 circuit as input, optimize it, and return the optimized circuit.
However, I'm encountering issues with certain QASM2 grammar elements, particularly "if" and "reset" statements. I get the following error:
TypeError: Invalid specification c0==1
I'm trying to determine whether this issue is due to the pyzx library not fully supporting the QASM2 grammar or if there's something wrong with my approach.
Here is the function I’ve written to optimize the circuit:
def optimize(circuit: str) -> str:
"""
Optimize a circuit.
@param: circuit to optimize in QASM2
@return: optimized circuit.
"""
c = zx.Circuit.from_qasm(circuit)
g = c.to_graph()
zx.full_reduce(g, quiet=True)
c_opt = zx.extract_circuit(g.copy())
int_str = zx.Circuit.to_qasm(c_opt)
return int_strAnd here is an example of a circuit that leads to the error:
OPENQASM 2.0;
include "qelib1.inc";
qreg q[18];
creg c[14];
h q[0];
h q[1];
h q[2];
h q[3];
h q[4];
h q[5];
cx q[0],q[6];
cx q[1],q[8];
cx q[2],q[10];
cx q[3],q[6];
cx q[3],q[7];
cx q[4],q[8];
cx q[4],q[9];
cx q[5],q[10];
cx q[5],q[11];
x q[6];
x q[8];
x q[9];
x q[10];
x q[11];
reset q[13];
reset q[14];
reset q[15];
reset q[16];
reset q[17];
measure q[12] -> c[12];
measure q[0] -> c[0];
measure q[1] -> c[1];
measure q[2] -> c[2];
measure q[3] -> c[3];
measure q[4] -> c[4];
measure q[5] -> c[5];
measure q[6] -> c[6];
measure q[7] -> c[7];
measure q[8] -> c[8];
measure q[9] -> c[9];
measure q[10] -> c[10];
measure q[11] -> c[11];
Is this a limitation of the pyzx library in handling the full QASM2 grammar, or am I missing something in the code?
Any guidance or suggestions would be greatly appreciated! Thank you in advance.
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