Unanswered Questions
131 questions with no upvoted or accepted answers
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Many jobs hanging after creating
I am running a VQE calculation running from a cluster using nohup.
However, some of my jobs keep hanging with 'creating' and therefore my VQE is not converging/not working.
However, at the same time,...
- 17.8k
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64
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Transfer trained machine learning model
I know just the basics of quantum computer i.e. superposition, entanglement, gates and few other kinds of stuff.
Now the question is it possible to transfer a trained machine learning model from IBM ...
- 111
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519
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Job execution issue while using IBMQ Experience
I am trying to run QSVM algorithm on the IBMQ backend devices using the API_TOKEN. Below is the snippet of the code that I am running. The code fails the validation test and throws an exception after ...
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449
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Please help: get_statevector gives wrong result in qiskit
I simulated the circuit below in qiskit and used the statevector simulator to extract the statevector:
The resulting statevector that it gave me was:
array([ 0.5+0.j, -0.5+0.j, 0.5+0.j, 0.5+0.j])
...
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789
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Comparing CPU to QPU In terms of processing power
The current processors are limited by the speed of the electrons but quantum processors take advantage of the properties of subatomic particles. But the question is how to compare the processing power ...
- 17.8k
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244
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Having trouble communicating with the IBM Q Experience REST API
I have started using IBM's Q Experience and I am trying to obtain an access token in order to communicate with the REST API. I understand that I can use my API token to obtain authorization by sending ...
- 17.8k
1
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74
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QE error: No handlers could be found for logger
When I run a QASM program on a QE simulator, I get this error.
No handlers could be found for logger
"IBMQuantumExperience.IBMQuantumExperience"
What ...
- 17.8k
1
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1
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60
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What is "time in system" for a given job and how to retrieve?
I noticed that there is "time in system" for each job.
For example:
I was wondering what does this mean? I am guessing this means the time of the first shot starts on the quantum devices ...
CommunityBot
- 1
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45
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RuntimeJobFailureError: 'Unable to retrieve job result. Error code 1520; The instruction cost per qubit exceeds the system limit
I want to find two operands of multiplication result of 180. In another word, finding integer factors of 180.
I'm using ...
glS♦
- 26.9k
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23
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Process Tomography and transpiler not running and eventually crashing kernel
I am running a Quantum Process Tomography on a circuit with a custom pulse added to a calibation for a CNOT gate.
Upon running the circuit, running it on the backend takes forever and eventually ends ...
glS♦
- 26.9k
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42
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Gate fidelity reported in the ibm qcs
Simple question: for some retired ibm quantum computers (for instance lima), how was the gate fidelity measured? I know that they involved a kind of average fidelity, but I would like to know ...
- 641
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Does anyone have an idea about the execution power of IBM summit for VQE? I'd appreciate sources of papers as well for supercomputer execution
I'm trying to find the execution power of VQE in super computer and I want to know the factors of execution such as iterations, shots, convergence, etc. Please help me and also, I'd appreciate if ...
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42
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Run Qiskit Finance Tutorial on IBMQ backend
I tried to implement the qiskit example for portfolio optimization and it works as described. However I am not able to change the backend to one of the IBMQ machines - and it's not clear to me if this ...
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239
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Qiskit IBM Runtime EstimatorV2 has changed the user specified default number of shots
While I am running some simulations on IBM hardware, I've noticed that the number of shots recorded in the metadata of the job is different from the number of shots I've specified. For example, I've ...
- 139
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113
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How to calculate the state vector of a circuit using sampler().run()
I run a circuit using:
jobCircuit = Sampler(backend).run(circuit)
resultCircuit = jobCircuit.result()
How can I access to a state vector of the circuit? I tried ...
- 14.9k