Can I run circuits on real hardware as offline? I mean that a job with 100 circuits may take a long time and I want to shot down my laptop in running time. In the meantime, can the real hardware run all of the circuits in the job, and in another time I can obtain my results? Or is it necessary my laptop to be turned on till I receive the last result? If I need any code for this issue, I would be very grateful anyone can provide it.
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2 Answers
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All jobs sent to IBMQ backends are asynchronous. You just need to save the job ID and use the ID retrieve it later. For example:
provider = IBMQ.load_account()
backend = provider.get_backend('ibmq_vigo')
job = execute(circuits, backend)
print(job.job_id())
Once the job is submitted, you can turn off your laptop. Then when you're ready to get the results, do
result = backend.retrieve_job(job_id).result()
If you forget to write down the job ID, you can always find it on the IQX dashboard or use backend.jobs() to query for it.
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To answer your question, you do not have to be on online the whole time in order for your job to run on the real hardware. If you create a job with 100 circuits and get the job_id with the command
job.job_id()
you can leave the IBM Quantum Experience website or shut down your computer and when you come back, you can do the following in the same or different notebook:
from qiskit import *
provider = IBMQ.load_account() #or you can specify the provider with IBMQ.get_provider(hub=..., group=..., project=...)
backend = provider.backends.<backend_name>
job = backend.retrieve_job(<job_id>)
job.status()
And you will have your job stored in the variable job. The command job.status() helps you see what stage your job is in. If the output is DONE, then you can retrieve your results.
