ARNICA

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"""Basic example with the Qiskit AQT provider. Creates a 4-qubit GHZ state."""

import qiskit
from qiskit import QuantumCircuit

from qiskit_aqt_provider.aqt_provider import AQTProvider

if __name__ == "__main__":
    # Ways to authenticate the AQTProvider with an Arnica account:
    # - using the `log_in` method
    # - with a static access token (in precedence order):
    #   - as argument to the AQTProvider initializer
    #   - in the AQT_TOKEN environment variable
    # - if none of the above is provided, no authentication is attempted and
    #   access is restricted to the default workspace only.
    provider = AQTProvider()

    # The backends() method lists all available computing backends. Printing it
    # renders it as a table that shows each backend's containing workspace.
    print(provider.backends())

    # Retrieve a backend by providing search criteria. The search must have a single
    # match. For example:
    backend = provider.get_backend("offline_simulator_no_noise", workspace="default")

    # Define a quantum circuit that produces a 4-qubit GHZ state.
    qc = QuantumCircuit(4)
    qc.h(0)
    qc.cx(0, 1)
    qc.cx(0, 2)
    qc.cx(0, 3)
    qc.measure_all()

    # Transpile for the target backend.
    qc = qiskit.transpile(qc, backend)

    # Execute on the target backend.
    result = backend.run(qc, shots=200).result()

    if result.success:
        print(result.get_counts())
    else:  # pragma: no cover
        print(result.to_dict()["error"])

You can find sample code for the AQT Qiskit provider in the GitHub repository linked below. Browse the repository for additional examples and guidance on how to start running your code on AQT hardware. If you would like your own examples to be featured here, please contact us.