Merge pull request #574 from qiboteam/dispersive_qutrit

Add dispersive shift with qutrits

src/qibocal/protocols/characterization/__init__.py

@@ -15,6 +15,7 @@
 from .coherence.zeno import zeno
 from .coherence.zeno_msr import zeno_msr
 from .dispersive_shift import dispersive_shift
+from .dispersive_shift_qutrit import dispersive_shift_qutrit
 from .fast_reset.fast_reset import fast_reset
 from .flipping import flipping
 from .flux_dependence.qubit_flux_dependence import qubit_crosstalk, qubit_flux
@@ -101,3 +102,4 @@ class Operation(Enum):
     qubit_spectroscopy_ef = qubit_spectroscopy_ef
     qutrit_classification = qutrit_classification
     resonator_amplitude = resonator_amplitude
+    dispersive_shift_qutrit = dispersive_shift_qutrit

src/qibocal/protocols/characterization/dispersive_shift_qutrit.py

@@ -0,0 +1,301 @@
+from copy import deepcopy
+from dataclasses import asdict, dataclass
+
+import numpy as np
+import plotly.graph_objects as go
+from plotly.subplots import make_subplots
+from qibolab import AcquisitionType, AveragingMode, ExecutionParameters
+from qibolab.platform import Platform
+from qibolab.pulses import PulseSequence
+from qibolab.qubits import QubitId
+from qibolab.sweeper import Parameter, Sweeper, SweeperType
+
+from qibocal.auto.operation import Qubits, Results, Routine
+from qibocal.protocols.characterization.utils import (
+    GHZ_TO_HZ,
+    HZ_TO_GHZ,
+    V_TO_UV,
+    lorentzian,
+    lorentzian_fit,
+    table_dict,
+    table_html,
+)
+
+from .dispersive_shift import DispersiveShiftData, DispersiveShiftParameters
+from .resonator_spectroscopy import ResSpecType
+
+
+@dataclass
+class DispersiveShiftQutritParameters(DispersiveShiftParameters):
+    """Dispersive shift inputs."""
+
+
+@dataclass
+class DispersiveShiftQutritResults(Results):
+    """Dispersive shift outputs."""
+
+    frequency_state_zero: dict[QubitId, float]
+    """State zero frequency."""
+    frequency_state_one: dict[QubitId, float]
+    """State one frequency."""
+    frequency_state_two: dict[QubitId, float]
+    """State two frequency."""
+    fitted_parameters_state_zero: dict[QubitId, dict[str, float]]
+    """Fitted parameters state zero."""
+    fitted_parameters_state_one: dict[QubitId, dict[str, float]]
+    """Fitted parameters state one."""
+    fitted_parameters_state_two: dict[QubitId, dict[str, float]]
+    """Fitted parameters state one."""
+
+    @property
+    def state_zero(self):
+        return {key: value for key, value in asdict(self).items() if "zero" in key}
+
+    @property
+    def state_one(self):
+        return {key: value for key, value in asdict(self).items() if "one" in key}
+
+    @property
+    def state_two(self):
+        return {key: value for key, value in asdict(self).items() if "two" in key}
+
+
+"""Custom dtype for rabi amplitude."""
+
+
+@dataclass
+class DispersiveShiftQutritData(DispersiveShiftData):
+    """Dipsersive shift acquisition outputs."""
+
+
+def _acquisition(
+    params: DispersiveShiftParameters, platform: Platform, qubits: Qubits
+) -> DispersiveShiftQutritData:
+    r"""
+    Data acquisition for dispersive shift experiment.
+    Perform spectroscopy on the readout resonator, with the qubit in ground and excited state, showing
+    the resonator shift produced by the coupling between the resonator and the qubit.
+
+    Args:
+        params (DispersiveShiftParameters): experiment's parameters
+        platform (Platform): Qibolab platform object
+        qubits (dict): list of target qubits to perform the action
+
+    """
+
+    # create 3 sequences of pulses for the experiment:
+    # sequence_0: I  - MZ
+    # sequence_1: RX - MZ
+    # sequence_2: RX - RX12 - MZ
+
+    # taking advantage of multiplexing, apply the same set of gates to all qubits in parallel
+    sequence_0 = PulseSequence()
+    sequence_1 = PulseSequence()
+    sequence_2 = PulseSequence()
+
+    for qubit in qubits:
+        rx_pulse = platform.create_RX_pulse(qubit, start=0)
+        rx_12_pulse = platform.create_RX12_pulse(qubit, start=rx_pulse.finish)
+        ro_pulse = platform.create_qubit_readout_pulse(qubit, start=0)
+        sequence_1.add(rx_pulse)
+        sequence_2.add(rx_pulse, rx_12_pulse)
+        for sequence in [sequence_0, sequence_1, sequence_2]:
+            readout_pulse = deepcopy(ro_pulse)
+            readout_pulse.start = sequence.qd_pulses.finish
+            sequence.add(readout_pulse)
+
+    # define the parameter to sweep and its range:
+    delta_frequency_range = np.arange(
+        -params.freq_width // 2, params.freq_width // 2, params.freq_step
+    )
+
+    data = DispersiveShiftQutritData(resonator_type=platform.resonator_type)
+
+    for state, sequence in enumerate([sequence_0, sequence_1, sequence_2]):
+        sweeper = Sweeper(
+            Parameter.frequency,
+            delta_frequency_range,
+            pulses=list(sequence.ro_pulses),
+            type=SweeperType.OFFSET,
+        )
+
+        results = platform.sweep(
+            sequence,
+            ExecutionParameters(
+                nshots=params.nshots,
+                relaxation_time=params.relaxation_time,
+                acquisition_type=AcquisitionType.INTEGRATION,
+                averaging_mode=AveragingMode.CYCLIC,
+            ),
+            sweeper,
+        )
+
+        for qubit in qubits:
+            result = results[qubit]
+            # store the results
+            data.register_qubit(
+                ResSpecType,
+                (qubit, state),
+                dict(
+                    freq=sequence.get_qubit_pulses(qubit).ro_pulses[0].frequency
+                    + delta_frequency_range,
+                    msr=result.magnitude,
+                    phase=result.phase,
+                ),
+            )
+
+    return data
+
+
+def _fit(data: DispersiveShiftQutritData) -> DispersiveShiftQutritResults:
+    """Post-Processing for dispersive shift"""
+    qubits = data.qubits
+
+    frequency_0 = {}
+    frequency_1 = {}
+    frequency_2 = {}
+    fitted_parameters_0 = {}
+    fitted_parameters_1 = {}
+    fitted_parameters_2 = {}
+
+    for i in range(3):
+        for qubit in qubits:
+            data_i = data[qubit, i]
+            freq, fitted_params = lorentzian_fit(
+                data_i, resonator_type=data.resonator_type, fit="resonator"
+            )
+            if i == 0:
+                frequency_0[qubit] = freq
+                fitted_parameters_0[qubit] = fitted_params
+            elif i == 1:
+                frequency_1[qubit] = freq
+                fitted_parameters_1[qubit] = fitted_params
+            else:
+                frequency_2[qubit] = freq
+                fitted_parameters_2[qubit] = fitted_params
+
+    return DispersiveShiftQutritResults(
+        frequency_state_zero=frequency_0,
+        frequency_state_one=frequency_1,
+        frequency_state_two=frequency_2,
+        fitted_parameters_state_one=fitted_parameters_1,
+        fitted_parameters_state_zero=fitted_parameters_0,
+        fitted_parameters_state_two=fitted_parameters_2,
+    )
+
+
+def _plot(data: DispersiveShiftQutritData, qubit, fit: DispersiveShiftQutritResults):
+    """Plotting function for dispersive shift."""
+    figures = []
+    fig = make_subplots(
+        rows=1,
+        cols=2,
+        horizontal_spacing=0.1,
+        vertical_spacing=0.1,
+        subplot_titles=(
+            "MSR (uV)",
+            "phase (rad)",
+        ),
+    )
+    # iterate over multiple data folders
+
+    fitting_report = ""
+
+    data_0 = data[qubit, 0]
+    data_1 = data[qubit, 1]
+    data_2 = data[qubit, 2]
+    fit_data_0 = fit.state_zero if fit is not None else None
+    fit_data_1 = fit.state_one if fit is not None else None
+    fit_data_2 = fit.state_two if fit is not None else None
+    for i, label, q_data, data_fit in list(
+        zip(
+            (0, 1, 2),
+            ("State 0", "State 1", "State 2"),
+            (data_0, data_1, data_2),
+            (fit_data_0, fit_data_1, fit_data_2),
+        )
+    ):
+        opacity = 1
+        frequencies = q_data.freq * HZ_TO_GHZ
+        fig.add_trace(
+            go.Scatter(
+                x=frequencies,
+                y=q_data.msr * V_TO_UV,
+                opacity=opacity,
+                name=f"{label}",
+                showlegend=True,
+                legendgroup=f"{label}",
+            ),
+            row=1,
+            col=1,
+        )
+        fig.add_trace(
+            go.Scatter(
+                x=frequencies,
+                y=q_data.phase,
+                opacity=opacity,
+                showlegend=False,
+                legendgroup=f"{label}",
+            ),
+            row=1,
+            col=2,
+        )
+
+        if fit is not None:
+            freqrange = np.linspace(
+                min(frequencies),
+                max(frequencies),
+                2 * len(q_data),
+            )
+            params = data_fit[
+                "fitted_parameters_state_zero"
+                if i == 0
+                else (
+                    "fitted_parameters_state_one"
+                    if i == 1
+                    else "fitted_parameters_state_two"
+                )
+            ][qubit]
+            fig.add_trace(
+                go.Scatter(
+                    x=freqrange,
+                    y=lorentzian(freqrange, **params),
+                    name=f"{label} Fit",
+                    line=go.scatter.Line(dash="dot"),
+                ),
+                row=1,
+                col=1,
+            )
+
+    if fit is not None:
+        fitting_report = table_html(
+            table_dict(
+                qubit,
+                [
+                    "State Zero Frequency [Hz]",
+                    "State One Frequency [Hz]",
+                    "State Two Frequency [Hz]",
+                ],
+                np.round(
+                    [
+                        fit_data_0["frequency_state_zero"][qubit] * GHZ_TO_HZ,
+                        fit_data_1["frequency_state_one"][qubit] * GHZ_TO_HZ,
+                        fit_data_2["frequency_state_two"][qubit] * GHZ_TO_HZ,
+                    ]
+                ),
+            )
+        )
+    fig.update_layout(
+        showlegend=True,
+        xaxis_title="Frequency (GHz)",
+        yaxis_title="MSR (uV)",
+        xaxis2_title="Frequency (GHz)",
+        yaxis2_title="Phase (rad)",
+    )
+
+    figures.append(fig)
+
+    return figures, fitting_report
+
+
+dispersive_shift_qutrit = Routine(_acquisition, fit=_fit, report=_plot)

tests/runcards/protocols.yml

@@ -437,6 +437,16 @@ actions:
       freq_step: 100_000
       nshots: 10
 
+  - id: dispersive shift qutrit
+    priority: 0
+    operation: dispersive_shift_qutrit
+    #FIXME: add qubit 4 with new release of Qibolab
+    qubits: [0, 1, 2, 3]
+    parameters:
+      freq_width: 10_000_000
+      freq_step: 100_000
+      nshots: 10
+
   - id: standard rb no error
     priority: 0
     operation: standard_rb