JSONDecodeError when getting results via IonQ Backend if not measuring all qubits

Bắt đầu trong azure/quantum/qiskit/job.py, đặc biệt là _format_results và _format_ionq_results, rồi tái hiện lỗi với một IonQ job không đo mọi qubit. Kiểm tra cách meas_map được xử lý trước khi phân tích JSON. Được xem là hoàn tất khi job.result() định dạng kết quả mà không gây ra JSONDecodeError đối với các mạch được đo một phần.

Sharing on behalf of @amirebrahimi:

I'm getting an error when calling job.result() from ionq.simulator. Details in thread.

---------------------------------------------------------------------------
JSONDecodeError                           Traceback (most recent call last)
/tmp/ipykernel_15433/1564545644.py in <module>
      1 # print(result)
----> 2 print(job.result())

/usr/local/lib/python3.7/site-packages/azure/quantum/qiskit/job.py in result(self, timeout)
     75 
     76         success = self._azure_job.details.status == "Succeeded"
---> 77         results = self._format_results()
     78 
     79         return Result.from_dict(

/usr/local/lib/python3.7/site-packages/azure/quantum/qiskit/job.py in _format_results(self)
    118 
    119             elif (self._azure_job.details.output_data_format == IONQ_OUTPUT_DATA_FORMAT):
--> 120                 job_result["data"] = self._format_ionq_results()
    121                 job_result["header"] = self._azure_job.details.metadata
    122 

/usr/local/lib/python3.7/site-packages/azure/quantum/qiskit/job.py in _format_ionq_results(self)
    140         if "meas_map" not in self._azure_job.details.metadata or "num_qubits" not in self._azure_job.details.metadata:
    141             raise ValueError(f"Job with ID {self.id()} does not have the required metadata to format IonQ results.")
--> 142         meas_map = json.loads(self._azure_job.details.metadata.get("meas_map"))
    143         num_qubits = self._azure_job.details.metadata.get("num_qubits")
    144 

/usr/local/lib/python3.7/json/__init__.py in loads(s, encoding, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
    346             parse_int is None and parse_float is None and
    347             parse_constant is None and object_pairs_hook is None and not kw):
--> 348         return _default_decoder.decode(s)
    349     if cls is None:
    350         cls = JSONDecoder

/usr/local/lib/python3.7/json/decoder.py in decode(self, s, _w)
    335 
    336         """
--> 337         obj, end = self.raw_decode(s, idx=_w(s, 0).end())
    338         end = _w(s, end).end()
    339         if end != len(s):

/usr/local/lib/python3.7/json/decoder.py in raw_decode(self, s, idx)
    353             obj, end = self.scan_once(s, idx)
    354         except StopIteration as err:
--> 355             raise JSONDecodeError("Expecting value", s, err.value) from None
    356         return obj, end

JSONDecodeError: Expecting value: line 1 column 14 (char 13)

A temporary fix: measure all your qubits
The problem is that meas_map may have None for any qubits you don't measure. which is breaking the parsing