fetchDetails

Retrieve details about quantum device or task

Since R2023a

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.

Examples

Fetch Details of Quantum Device Provided by AWS

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.

Fetch Details of Quantum Task Sent to AWS

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]

Fetch Details of Quantum Device Provided by IBM

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.

Fetch Details of Quantum Task Sent to 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

devtask — Quantum device or task

QuantumDeviceAWS object | QuantumDeviceIBM object | QuantumTaskAWS object | QuantumTaskIBM object

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