I am working on a program for Qiskit, but I am getting a strange error (one that I have not gotten in the past) when I try to simulate a circuit. Here is a minimal example producing the error:
from qiskit.circuit import QuantumCircuit
from qiskit import Aer,transpile
c = QuantumCircuit(2)
simulator = Aer.get_backend('qasm_simulator')
c = transpile(c, simulator)
result = simulator.run(c).result()
plot_histogram(counts, title='Counts')
The error I get is:
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-1-89904ecd5f8e> in <module>()
5 simulator = Aer.get_backend('qasm_simulator')
6 c = transpile(c, simulator)
----> 7 result = simulator.run(c).result()
8 plot_histogram(counts, title='Counts')
/Users/d/anaconda3/envs/qiskit/lib/python3.7/site-packages/qiskit/providers/aer/backends/aerbackend.py in run(self, qobj, backend_options, validate, **run_options)
146 # Add backend options to the Job qobj
147 qobj = self._format_qobj(
--> 148 qobj, backend_options=backend_options, **run_options)
149
150 # Optional validation
/Users/d/anaconda3/envs/qiskit/lib/python3.7/site-packages/qiskit/providers/aer/backends/aerbackend.py in _format_qobj(self, qobj, backend_options, **run_options)
353 """Return execution sim config dict from backend options."""
354 # Add options to qobj config overriding any existing fields
--> 355 config = qobj.config
356
357 # Add options
AttributeError: 'QuantumCircuit' object has no attribute 'config'
Does anyone know what is causing this error?
Thank you!
I believe you need to assemble the transpiled circuit in a qobj before running it :
from qiskit.compiler import assemble
my_qobj = assemble(c)
result = simulator.run(my_qobj).result()
By the way, without any measure, the plot_histogram(result.get_counts()) will return an error as well.
There is also a special platform the Quantum Computing, https://quantumcomputing.stackexchange.com, feel free to post any other questions about QC&co there :)