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14 changes: 8 additions & 6 deletions doc/GettingStarted.md
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Expand Up @@ -301,29 +301,31 @@ else:

SpinQit can convert its intermediate representation to OpenQASM codes in the form of string so that any third-party platform which suports OpenQASM can be used to execute codes written in SpinQit. The QASM backend is initialized using a handle function which can run OpenQASM codes. The result format of this backend depends on the actual execution platform. It would be better to convert the third-party results to the result formats of SpinQit in the handle. SpinQit provides a QiskitQasmResult class to process Qiskit results.

The following example shows how to define a handle for the QASM backend to use Qiskit 0.31.0 to execute a quantum circuit.
The following example shows how to define a handle for the QASM backend to use Qiskit 0.40.0 to execute a quantum circuit. (You may need to run `pip install qiskit==0.40` to add the qiskit dependency first, for the following example)

```python
from qiskit import QuantumCircuit
from qiskit import execute
from qiskit import Aer
from spinqit import get_qasm_backend, QasmConfig, QiskitQasmResult
from spinqit import get_qasm_backend, QasmConfig, QiskitQasmResult, get_compiler

def qiskit_fn(qasm, shots=1024, *args, **kwargs):
qc = QuantumCircuit.from_qasm_str(qasm)
simulator = Aer.get_backend('statevector_simulator')
result = execute(qc, simulator, *args, **kwargs).result()
print(result.get_statevector())
qiskit_result = QiskitQasmResult()
qiskit_result.set_result(result.get_statevector(), shots)
return qiskit_result

...
circuit = "circuit.qasm" # replace with the path to your qasm file

compiler = get_compiler('qasm')
exe = compiler.compile(circuit, 0)
config = QasmConfig()
config = QasmConfig(1024)
engine = get_qasm_backend(qiskit_fn)
states = engine.execute(exe, config).states
job = engine.execute(exe, config)

print(job.counts)
```


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