Amazon Braket

The Strangeworks Platform supports Amazon Braket, a fully managed quantum computing service that helps you get started with quantum computing. Amazon Braket provides a development environment for you to explore and build quantum algorithms, test them on quantum circuit simulators, and run them on different quantum hardware technologies.

strangeworks-braket

The strangeworks-braket SDK provides a drop-in replacement for code written for Amazon Braket.

📑 Package Documentation

Installation

To get started, make sure you have Python 3.10 or 3.11 (installation) and are familiar with setting up and using virtual environments.

pip install -U pip && pip install strangeworks-braket

Authentication

First, authenticate via the Strangeworks SDK with your api-key taken from the Portal homepage:

import strangeworks as sw
from strangeworks_braket import StrangeworksDevice
sw.authenticate(api_key="api-key")

Backends

List Available Devices and Display Device ARN
devices = StrangeworksDevice.get_devices(statuses=["ONLINE"])
print("Available devices:")
for device in devices:
    print(f"  - {device.name} ({device.arn})")

Company	Processor	Qubits	Framework	Processors
QuEra	Aquila	256	Braket	`braket.aquila`, `arn:aws:braket:us-east-1::device/qpu/quera/Aquila`
IonQ	Aria	25	Braket	`arn:aws:braket:us-east-1::device/qpu/ionq/Aria-1`
IQM	Garnet	20	Braket	`arn:aws:braket:eu-north-1::device/qpu/iqm/Garnet`

Disclaimer: This list of backends is subject to change at any time.

For more accurate and up-to-date information, please refer to the Amazon Braket documentation

Tasks

Run a Task

Amazon Braket: Hello World
import strangeworks as sw
from braket.circuits import Circuit
from strangeworks_braket import StrangeworksDevice

sw.authenticate(api_key="api-key")

# create a simple quantum circuit
bell_state = Circuit().h(0).cnot(0, 1)

# Choose a device (an AWS-hosted simulator in this case)
tn1 = StrangeworksDevice("arn:aws:braket:::device/quantum-simulator/amazon/sv1")

# Execute the circuit
print("\n🤖 Executing Circuit...\n")

task = tn1.run(bell_state, 1000)

# At this point, the job is running on the Strangeworks Platform.
# You can check the status of the job in the Portal, even if
# stop this script.
print(f"⏳ Job {task.id} submitted!\n")

# Lots of good info in here
result = task.result()

# View the counts (also visible in the Portal in a chart 📊)
print(f"🎉 📊 Counts: {result.measurement_counts}\n")

🥳 Success! You may view your job in the portal.

😅 Something went wrong? Find us in Slack!

Cancel a Task

You can cancel a task using the cancel method. This will stop the task and prevent further charges although you may still be charged for the time the task was running.

Amazon Braket: Cancel Job
from strangeworks_braket import StrangeworksDevice
from braket.circuits import Circuit

device = StrangeworksDevice("arn:aws:braket:us-east-1::device/qpu/ionq/Aria-1")
circuit = Circuit().h(0).cnot(0, 1)

task = device.run(circuit, shots=2500)

# Cancel the job
task.cancel()

Hybrid Jobs

Hybrid jobs allow for the integration of classical and quantum computing tasks. The execution of these tasks on the Strangeworks Platform is similar to Braket Hybrid Jobs with a few minor differences.

An example script is shown below which will run a simple bell state circuit a number of times given by the input parameter num_iter.

The form of the script has to follow a number of guidelines:

The script must contain a function called main that takes no inputs, def main(). The inputs will be read in by the load_hyperparameters(), see example below. This will be the entry point for the aws job.
The script must contain only one function called main
The braket tracker must be imported, from braket.tracking import Tracker
The braket tracker must be started on the line right after def main(): or immediately following any comments after def main():
The braket save job result function must be imported from braket.jobs import save_job_result
The results of the tracker must saved using the save_job_result function from braket by including "task summary": t.quantum_tasks_statistics(), in the output dictionary.
Nothing can follow save_job_result in the function main()

To run the examples, first save the below script as braket_hybrid_script.py or download it here: braket_hybrid_script.py

Amazon Braket: Hybrid Job Script

import json
import os

from braket.aws import AwsDevice
from braket.circuits import Circuit
from braket.jobs import save_job_result
from braket.tracking import Tracker


def main():
    """
    Example Hybrid Job File
    """
    t = Tracker().start()

    device_arn = os.environ["AMZN_BRAKET_DEVICE_ARN"]
    # Initialise device
    device = AwsDevice(device_arn)
    print(f"Using device {device}")

    hyperparams = load_hyperparameters()
    print("Hyperparameters are:", hyperparams)

    shots = int(hyperparams.get("shots"))
    num_iter = int(hyperparams.get("num_iter"))

    counts = []
    bell = Circuit().h(0).cnot(0, 1)
    for count in range(num_iter):
        task = device.run(bell, shots=shots)
        print(task.result().measurement_counts)
        counts.append(task.result().measurement_counts)

    # return results as strings
    save_job_result(
        {
            "counts": json.dumps(counts),
            "task summary": t.quantum_tasks_statistics(),
            "estimated cost": t.qpu_tasks_cost() + t.simulator_tasks_cost()
        }
    )


def load_hyperparameters():
    """Load the Hybrid Job hyperparameters"""
    hp_file = os.environ["AMZN_BRAKET_HP_FILE"]
    with open(hp_file) as f:
        hyperparams = json.load(f)
    return hyperparams

Run a Hybrid Job

Here’s how the task is implemented using the Strangeworks SDK. For an example of running a simple hybrid job using Amazon Braket see Hybrid Jobs:

The key differences between Strangeworks and Braket for job submission are:

In Braket, the job creation process involves using the AwsQuantumJob.create() function and explicitly specifying parameters such as the device, source module, entry point, and hyperparameters.
In Strangeworks, the run_hybrid() method is used for job submission, with the source module path and hyperparameters passed directly as arguments.

These differences highlight how Strangeworks aims to streamline the job submission process and make it more accessible for users:

Strangeworks Braket Service: Hybrid Jobs
import strangeworks
from strangeworks_braket import StrangeworksDevice

# Authenticate with your Strangeworks API key
strangeworks.authenticate(api_key="your-api-key")

# Initialize the quantum device
device = StrangeworksDevice("arn:aws:braket:::device/quantum-simulator/amazon/sv1")

# Submit the hybrid job
soure_module = "./braket_hybrid_script.py"
hyperparameters = {"shots": 100, "num_iter": 5}
sw_job = device.run_hybrid(soure_module, hyperparameters)

# Retrieve the job result
result = sw_job.result()
print(result)

🥳 Success! You may view your job in the portal.

😅 Something went wrong? Find us in Slack!

Cancel a Hybrid Job

For hybrid jobs, the cancel command terminates the classical hybrid job container immediately and does a best effort to cancel all of the related quantum tasks that are still in a non-terminal state. This will stop the job and prevent further charges although some charges may still apply for the work that has already been done. The job status will be updated to CANCELLED in the portal.

Amazon Braket: Cancel Hybrid Job
from strangeworks_braket import StrangeworksDevice

device = StrangeworksDevice("arn:aws:braket:::device/quantum-simulator/amazon/sv1")

soure_module = "./braket_hybrid_script.py"
hyperparameters = {"shots": 100, "num_iter": 5}
sw_job = device.run_hybrid(soure_module, hyperparameters)

# Cancel the job
sw_job.cancel()

Advanced Features

Error Mitigation

Error mitigation techniques on IonQ Aria

Strangeworks Braket: Error Mitigation
import strangeworks as sw
from strangeworks_braket import StrangeworksDevice
from braket.circuits import Circuit
from braket.error_mitigation import Debias

sw.authenticate('api-key')
device = StrangeworksDevice("ionq_aria")
circuit = Circuit().h(0).cnot(0, 1)

task = device.run(circuit, shots=2500, device_parameters={"errorMitigation": Debias()})

result = task.result()
print(result.measurement_counts)

🥳 Success! You may view your job in the portal.

😅 Something went wrong? Find us in Slack!

Pulse Control

Pulse control on Braket is supported by using StrangeworksDevice

Qubit Spectroscopy

The following example demonstrates how to perform qubit spectroscopy using a Gaussian waveform.

Qubit Spectroscopy
import strangeworks as sw
from strangeworks_braket import StrangeworksDevice
from braket.pulse import GaussianWaveform, PulseSequence
from braket.parametric import FreeParameter

sw.authenticate(api_key="your-api-key")
device = StrangeworksDevice("arn:aws:braket:us-west-1::device/qpu/rigetti/Ankaa-2")

if device.status == "ONLINE":
    device_name = "ankaa"

    experiment_configuration = {
        "ankaa": {
            "device_arn": "arn:aws:braket:us-west-1::device/qpu/rigetti/Ankaa-2",
            "qubit": 3,
            "drive_frame": "Transmon_3_charge_tx",
            "readout_frame": "Transmon_3_readout_rx",
            "spectroscopy_wf": GaussianWaveform(100e-9, 25e-9, 0.1, True),
            "rabi_wf": GaussianWaveform(
                FreeParameter("length"), FreeParameter("length") * 0.25, 0.2, True
            ),
        },
    }

    drive_frame = device.frames[experiment_configuration[device_name]["drive_frame"]]
    readout_frame = device.frames[experiment_configuration[device_name]["readout_frame"]]
    waveform = experiment_configuration[device_name]["spectroscopy_wf"]

    frequency = FreeParameter("frequency")

    pulse_sequence = (
        PulseSequence()
        .set_frequency(drive_frame, frequency)
        .play(drive_frame, waveform)
        .capture_v0(readout_frame)
    )

    span = 75e6
    N_shots = 100

    qubit_spectroscopy_sequences = pulse_sequence(frequency=drive_frame.frequency - span / 2)
    task = device.run(qubit_spectroscopy_sequences, shots=N_shots)
    print(task.result().measurement_counts)

Custom Gate with Pulse

The following example demonstrates how to create a custom single-qubit gate using Gaussian waveforms.

Custom Gate with Pulse
import strangeworks as sw
from strangeworks_braket import StrangeworksDevice
import braket.circuits.circuit as circuit
from braket.pulse import GaussianWaveform, PulseSequence
from braket.parametric import FreeParameter
from braket.circuits import Circuit

sw.authenticate(api_key="api-key")
device = StrangeworksDevice("arn:aws:braket:us-west-1::device/qpu/rigetti/Ankaa-2")

if device.status == "ONLINE":
    qubit = 3
    drive_frame = device.frames[f"Transmon_{qubit}_charge_tx"]

    width = 5e-9
    length = 40e-9

    x90_amplitude = 0.9
    x90 = GaussianWaveform(length, width, x90_amplitude, False)

    lambda_ = FreeParameter("lambda_")
    theta = FreeParameter("theta")
    phi = FreeParameter("phi")

    U_sequence = (
        PulseSequence()
        .shift_phase(drive_frame, np.pi / 2 - lambda_)
        .play(drive_frame, x90)
        .shift_phase(drive_frame, theta - np.pi)
        .play(drive_frame, x90)
        .shift_phase(drive_frame, np.pi / 2 - phi)
    )

    @circuit.subroutine(register=True)
    def U_pulses(theta, phi, lambda_):
        return Circuit().pulse_gate(
            [qubit],
            pulse_sequence=U_sequence(theta=theta, phi=phi, lambda_=lambda_),
        )

    nb_shots = 500
    task = device.run(
        Circuit().rx(4, np.pi / 2).rz(4, np.pi / 2).U_pulses(2 * np.pi, 0, 0),
        shots=nb_shots,
        disable_qubit_rewiring=True,
    )
    print(task.result().measurement_counts)

🥳 Success! You may view your job in the portal.

😅 Something went wrong? Find us in Slack!

Amazon Braket

strangeworks-braket​

Installation​

Authentication​

Backends​

Tasks​

Run a Task​

Cancel a Task​

Hybrid Jobs​

Run a Hybrid Job​

Cancel a Hybrid Job​

Advanced Features​

Error Mitigation​

Pulse Control​

Qubit Spectroscopy​

Custom Gate with Pulse​

strangeworks-braket

Installation

Authentication

Backends

Tasks

Run a Task

Cancel a Task

Hybrid Jobs

Run a Hybrid Job

Cancel a Hybrid Job

Advanced Features

Error Mitigation

Pulse Control

Qubit Spectroscopy

Custom Gate with Pulse