laboneq_applications.experiments.qubit_spectroscopy_amplitude

This module defines the qubit spectroscopy experiment.

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

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, amplitudes, 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	QuantumElements	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
amplitudes	QubitSweepPoints	The amplitudes to sweep over for each qubit. It must be a list of numbers or arrays or 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 [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(
    quantum_elements=[TunableTransmonQubit("q0"), TunableTransmonQubit("q1")],
    quantum_operations=TunableTransmonOperations(),
)
temp_qubits = qpu.copy_quantum_elements()
create_experiment(
    qpu=qpu,
    qubits=temp_qubits,
    frequencies = [
        np.linspace(5.8e9, 6.2e9, 101),
        np.linspace(0.8e9, 1.2e9, 101)
    ],
    amplitudes=[[0.1, 0.5, 1], [0.1, 0.5, 1]],
    options=options,
)

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

The Qubit Spectroscopy Workflow.

The workflow consists of the following steps:

• create_experiment
• compile_experiment
• run_experiment
• analysis_workflow

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	QuantumElements	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
amplitudes	QubitSweepPoints	The amplitudes to sweep over for each qubit drive pulse. amplitudes 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 | tuple[str, str, str], dict | QuantumParameters] | None	The temporary parameters with which to update the quantum elements and topology edges. For quantum elements, the dictionary key is the quantum element UID. For topology edges, the dictionary key is the edge tuple (tag, source node UID, target node UID).	None
options	TuneUpWorkflowOptions | None	The options for building the workflow as an instance of [QubitSpectroscopyWorkflowOptions]. See the docstring of [QubitSpectroscopyWorkflowOptions] for more details.	None

Returns:

Name	Type	Description
result	None	The result of the workflow.

Example

options = experiment_workflow.options()
options.create_experiment.count(10)
qpu = QPU(
    quantum_elements=[TunableTransmonQubit("q0"), TunableTransmonQubit("q1")],
    quantum_operations=TunableTransmonOperations(),
)
temp_qubits = qpu.copy_quantum_elements()
result = experiment_workflow(
    session=session,
    qpu=qpu,
    qubits=temp_qubits,
    frequencies = [
        np.linspace(5.8e9, 6.2e9, 101),
        np.linspace(0.8e9, 1.2e9, 101)
    ],
    amplitudes=[[0.1, 0.5, 1], [0.1, 0.5, 1]],
    options=options,
).run()