Jobs

In this module, you will learn how to use the qBraid SDK to manage your quantum jobs.

The device module illustrated how qBraid device wrappers can be used execute circuits on quantum backends. Using the OQC Lucy QPU as our example target backend, the procedure was as follows:

>>> from qbraid import device_wrapper
>>> qbraid_id = 'aws_oqc_lucy'
>>> qdevice = device_wrapper(qbraid_id)
>>> qjob = qdevice.run(circuit)
>>> type(qjob)
qbraid.devices.aws.job.BraketQuantumTaskWrapper

Invoking the run method of a qBraid DeviceLikeWrapper returns a qBraid JobLikeWrapper. Through a unified set of methods and attributes, this class provides access to data about the quantum jobs executed across any qBraid supported backend. You can also directly access the wrapped “job-like” object using the vendor_jlo attribute.

>>> type(qjob.vendor_jlo)
braket.aws.aws_quantum_task.AwsQuantumTask

Check the status of your quantum job using the status method:

>>> qjob.status()
<JobStatus.QUEUED: 1>

Each quantum job executed through the qBraid SDK is assigned its own unique job ID.

>>> qjob.id
aws_oqc_lucy-exampleuser-qjob-xxxxxxxxxxxxxxxxxxxx

You can use the get_jobs function to a return a list of your previously submitted quantum jobs, along with the status of each. A number of filtering options are available to help narrow your search. Query syntax is equivalent to that of the get_devices unified device search. By default, get_jobs returns the 10 most recently submitted jobs matching your search.

>>> from qbraid import get_jobs
>>> get_jobs(filters={"qbraidDeviceId": "aws_oqc_lucy"})
Displaying 10 most recent jobs matching query:

Job ID                                                  Submitted                 Status
------                                                  ---------                 ------
aws_oqc_lucy-exampleuser-qjob-xxxxxxxxxxxxxxxxxxxx      2023-05-21T21:13:48.220Z  RUNNING
aws_oqc_lucy-exampleuser-qjob-yyyyyyyyyyyyyyyyyyyy      2023-04-15T11:09:56.783Z  COMPLETED
...

This job ID can be used to reinstantiate a qBraid JobLikeWrapper object at any time, and even in a seperate program, with no loss of information.

>>> from qbraid import job_wrapper
>>> saved_job_id = 'aws_oqc_lucy-exampleuser-qjob-xxxxxxxxxxxxxxxxxxxx'
>>> qjob = job_wrapper(saved_job_id)

Once the quantum job is complete, use the result method to gather the result:

>>> qjob.wait_for_final_state()
>>> qjob.status()
<JobStatus.COMPLETED: 6>
>>> qresult = qjob.result()

Jobs submitted through the SDK are organized in the qBraid Lab Quantum Jobs Sidebar:

The next module will go in depth on qBraid SDK quantum results.