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fetchDetails

Retrieve details about quantum device or task

Since R2023a

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Installation Required: This functionality requires MATLAB Support Package for Quantum Computing.

Syntax

s = fetchDetails(devtask)

Description

s = fetchDetails(devtask) returns information about the specified quantum device or task.

example

Examples

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Connect to a remote quantum device through AWS® by specifying the device name as "Lucy".

dev = quantum.backend.QuantumDeviceAWS("Lucy")
dev = 

  QuantumDeviceAWS with properties:

         Name: "Lucy"
    DeviceARN: "arn:aws:braket:eu-west-2::device/qpu/oqc/Lucy"
       Region: "eu-west-2"
       S3Path: "s3://amazon-braket-mathworks/default"

Retrieve details about the quantum device.

s = fetchDetails(dev)
s = 

  struct with fields:

             deviceArn: "arn:aws:braket:eu-west-2::device/qpu/oqc/Lucy"
    deviceCapabilities: "{"service": {"braketSchemaHeader": {"name"... "
            deviceName: "Lucy"
          deviceStatus: "ONLINE"
            deviceType: "QPU"
          providerName: "Oxford"

To parse the deviceCapabilities field in the returned structure, you can use the jsondecode function to convert the description string into another structure.

capabilities = jsondecode(s.deviceCapabilities)
capabilities = 

  struct with fields:

               service: [1×1 struct]
                action: [1×1 struct]
      deviceParameters: [1×1 struct]
    braketSchemaHeader: [1×1 struct]
              paradigm: [1×1 struct]
              provider: [1×1 struct]
          standardized: [1×1 struct]
                 pulse: [1×1 struct]

The structure returned by fetchDetails changes from device to device, and its content may also change over time as provided by the AWS quantum computing services.

Connect to a remote quantum device through AWS by specifying the device name as "Aspen-M-3".

dev = quantum.backend.QuantumDeviceAWS("Aspen-M-3")
dev = 

  QuantumDeviceAWS with properties:

         Name: "Aspen-M-3"
    DeviceARN: "arn:aws:braket:us-west-1::device/qpu/rigetti/Aspen-M-3"
       Region: "us-west-1"
       S3Path: "s3://amazon-braket-mathworks/default"

Create a task to run a quantum circuit on this device. Wait for the task to finish.

gates = [hGate(1); cxGate(1,2)];
c = quantumCircuit(gates);
task = run(c,dev);
wait(task)
task
task = 

  QuantumTaskAWS with properties:

    TaskARN: "arn:aws:braket:us-west-1:123456789012:quantum-task/12a34b5c-6a78-9a01-2ab3-4c56def7a890"
     Status: "finished"

Retrieve details about the task.

s = fetchDetails(task)
s = 

  struct with fields:

      Task: [1×1 struct]
    Result: [1×1 struct]

Query the Task and Result fields of the returned structure. These fields contain details about the task and the measurement result of the task.

t = s.Task
t = 

  struct with fields:

            createdAt: "2023-01-11T00:32:30Z'
            deviceArn: "arn:aws:braket:us-west-1::device/qpu/rigetti/Aspen-M-3"
     deviceParameters: "{"braketSchemaHeader": {"name": ... }}"
              endedAt: "2023-01-11T00:32:32Z"
       outputS3Bucket: "amazon-braket-mathworks"
    outputS3Directory: "default/a1b2c3d4-56ab-7bc8-d900-e0000fa1b2c3"
       quantumTaskArn: "arn:aws:braket:us-west-1:123456789012:quantum-task/12a34b5c-6a78-9a01-2ab3-4c56def7a890"
                shots: 100
               status: "COMPLETED"
r = s.Result
r = 

  struct with fields:

    braketSchemaHeader: [1×1 struct]
          measurements: [100×2 double]
           resultTypes: [1×1 struct]
        measuredQubits: [2×1 double]
          taskMetadata: [1×1 struct]
    additionalMetadata: [1×1 struct]

Connect to a remote quantum device through the IBM® Qiskit® Runtime Services by specifying the device name as "ibmq_qasm_simulator".

dev = quantum.backend.QuantumDeviceIBM("ibmq_qasm_simulator")
dev = 

  QuantumDeviceIBM with properties:

         Name: "ibmq_qasm_simulator"
  AccountName: "<my account name>"
   UseSession: 0

Retrieve details about the quantum device.

s = fetchDetails(dev)
s = 

  struct with fields:

         Status: [1×1 struct]
  Configuration: [1×1 struct]
     Properties: [1×1 struct]
       Defaults: [1×1 struct]

To check on the content of one of the fields, you can query into that field. For example, show the content of the Properties field.

s.Properties
ans = 

struct with fields:

    backend_name: 'ibmq_qasm_simulator'
 backend_version: '1.2.11'
           gates: [33×1 struct]
         general: [8×1 struct]
last_update_date: '2023-08-29T04:40:11Z'
          qubits: [5×8 struct]

The structure returned by fetchDetails changes from device to device, and its content may also change over time as provided by IBM.

Connect to a remote quantum device through IBM Qiskit Runtime Services by specifying the device name as "ibmq_qasm_simulator".

dev = quantum.backend.QuantumDeviceIBM("ibmq_qasm_simulator")
dev = 

  QuantumDeviceIBM with properties:

           Name: "ibmq_qasm_simulator"
    AccountName: "<my account name>"
     UseSession: 0

Create a task to run a quantum circuit on this device. Wait for the task to finish.

gates = [hGate(1); cxGate(1,2)];
c = quantumCircuit(gates);
task = run(c,dev);
wait(task)
task
task = 

  QuantumTaskIBM with properties:

         TaskID: "123abcd4efa5bcdef678"
      SessionID: <missing>
    AccountName: "<my account name>"
         Status: "queued"

Retrieve details about the task.

s = fetchDetails(task)
s = 

  struct with fields:

      Task: [1×1 struct]
    Result: [1×1 struct]

Query the Task and Result fields of the returned structure. These fields contain details about the task and the measurement result of the task.

t = s.Task
t = 

  struct with fields:

                id: '123abcd4efa5bcdef678'
               hub: 'ibm-q'
             group: 'open'
           project: 'main'
           backend: 'ibmq_qasm_simulator'
             state: [1×1 struct]
            params: [1×1 struct]
           program: [1×1 struct]
           created: '2023-08-24T18:00:18.6848Z'
              cost: 3600
    remote_storage: [1×1 struct]
            status: 'Completed'

r = s.Result
r = 

  struct with fields:

    quasi_dists: [1×1 struct]
       metadata: [1×1 struct]

The structure returned by fetchDetails changes from device to device, and its content may also change over time as provided by IBM.

Input Arguments

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Quantum task or device, specified as a QuantumDeviceAWS object, a QuantumDeviceIBM object, a QuantumTaskAWS object, or a QuantumTaskIBM object.

  • If devtask is a QuantumDeviceAWS object, then the output structure s contains fields provided by AWS.

  • If devtask is a QuantumDeviceIBM object, then the output structure s contains fields provided by IBM.

  • If devtask is a QuantumTaskAWS object, then the output structure s contains the fields s.Task for the task information and s.Result for the task result (if available). Each of these fields is also a structure containing fields provided by AWS.

  • If devtask is a QuantumTaskIBM object, then the output structure s contains the fields s.Task for the task information and s.Result for the task result (if available). Each of these fields is also a structure containing fields provided by IBM.

Version History

Introduced in R2023a

See Also

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