laboneq_applications.experiments.qubit_spectroscopy

This module defines the qubit spectroscopy experiment.

In this experiment, we sweep the frequency of a qubit drive pulse to characterize the qubit transition frequency.

The qubit spectroscopy experiment has the following pulse sequence:

qb --- [ prep transition ] --- [ x180_transition (swept frequency)] --- [ measure ]

If multiple qubits are passed to the run workflow, the above pulses are applied in parallel on all the qubits.

create_experiment(qpu, qubits, frequencies, options=None)

Creates a Qubit Spectroscopy Experiment.

Parameters:

Name	Type	Description	Default
qpu	QPU	The qpu consisting of the original qubits and quantum operations.	required
qubits	Qubits	The qubits to run the experiments on. May be either a single qubit or a list of qubits.	required
frequencies	QubitSweepPoints	The qubit frequencies to sweep over for the qubit drive pulse. If qubits is a single qubit, frequencies must be a list of numbers or an array. Otherwise, it must be a list of lists of numbers or arrays.	required
options	QubitSpectroscopyExperimentOptions | None	The options for building the experiment. See [QubitSpectroscopyExperimentOptions] and [BaseExperimentOptions] for accepted options. Overwrites the options from [QubitSpectroscopyExperimentOptions] and [BaseExperimentOptions].	None

Returns:

Name	Type	Description
experiment	Experiment	The generated LabOne Q experiment instance to be compiled and executed.

Raises:

Type	Description
ValueError	If the qubits, amplitudes, and frequencies are not of the same length.
ValueError	If amplitudes and frequencies are not a list of numbers when a single qubit is passed.
ValueError	If frequencies is not a list of lists of numbers. If amplitudes is not None or a list of lists of numbers.

Example

options = QubitSpectroscopyExperimentOptions()
options.count = 10
qpu = QPU(
    qubits=[TunableTransmonQubit("q0"), TunableTransmonQubit("q1")],
    quantum_operations=TunableTransmonOperations(),
)
temp_qubits = qpu.copy_qubits()
create_experiment(
    qpu=qpu,
    qubits=temp_qubits,
    frequencies = [
        np.linspace(6.0e9, 6.3e9, 101),
        np.linspace(5.8e9, 6.2e9, 101)
    ]
    options=options,
)

experiment_workflow(session, qpu, qubits, frequencies, temporary_parameters=None, options=None)

The Qubit Spectroscopy Workflow.

The workflow consists of the following steps:

• create_experiment
• compile_experiment
• run_experiment
• analysis_workflow
• update_qubits

Parameters:

Name	Type	Description	Default
session	Session	The connected session to use for running the experiment.	required
qpu	QPU	The qpu consisting of the original qubits and quantum operations.	required
qubits	Qubits	The qubits to run the experiments on. May be either a single qubit or a list of qubits.	required
frequencies	QubitSweepPoints	The qubit frequencies to sweep over for the qubit drive pulse. If qubits is a single qubit, frequencies must be a list of numbers or an array. Otherwise, it must be a list of lists of numbers or arrays.	required
temporary_parameters	dict[str, dict | TransmonParameters] | None	The temporary parameters to update the qubits with.	None
options	TuneUpWorkflowOptions | None	The options for building the workflow. In addition to options from [WorkflowOptions], the following custom options are supported: - create_experiment: The options for creating the experiment.	None

Returns:

Name	Type	Description
WorkflowBuilder	None	The builder for the experiment workflow.

Example

options = experiment_workflow.options()
options.create_experiment.count(10)
qpu = QPU(
    qubits=[TunableTransmonQubit("q0"), TunableTransmonQubit("q1")],
    quantum_operations=TunableTransmonOperations(),
)
temp_qubits = qpu.copy_qubits()
result = experiment_workflow(
    session=session,
    qpu=qpu,
    qubits=temp_qubits,
    frequencies = [
        np.linspace(6.0e9, 6.3e9, 101),
        np.linspace(5.8e9, 6.2e9, 101)
    ]
    options=options,
).run()