e-f Gate Tuneup¶

In this reference notebook, you'll learn how to use LabOne Q's logical signals lines to perform tuneup of a pi-pulse working on the e-f transition of a superconducitng transmon qubit. This functionality requires an SHFSG or SHFQC and relies on using the command table instead of playWave commands.

0. General Imports and Definitions¶

0.1 Python Imports¶

In [ ]:

# LabOne Q:
from laboneq.simple import *

# Helpers:
from laboneq.contrib.example_helpers.plotting.plot_helpers import plot_simulation
from laboneq.contrib.example_helpers.generate_example_datastore import (
    generate_example_datastore,
    get_first_named_entry,
)

# LabOne Q: from laboneq.simple import * # Helpers: from laboneq.contrib.example_helpers.plotting.plot_helpers import plot_simulation from laboneq.contrib.example_helpers.generate_example_datastore import ( generate_example_datastore, get_first_named_entry, )

In [ ]:

# Build an in-memory data store with device setup and qubit parameters for the
# example notebooks
setup_db = generate_example_datastore(in_memory=True)

# Build an in-memory data store with device setup and qubit parameters for the # example notebooks setup_db = generate_example_datastore(in_memory=True)

1. Define Device Setup and Calibration¶

1.1 Define a Device Setup¶

We'll load a descriptor file to define our device setup and logical signal lines. We could, instead, explicitly include the descriptor here as a string and then use DeviceSetup.from_descriptor() below. Choose the best method that works for you!

In [ ]:

# load a calibrated device setup from the dummy database
device_setup = get_first_named_entry(db=setup_db, name="6_qubit_setup_shfqc_calibrated")

use_emulation = True

# load a calibrated device setup from the dummy database device_setup = get_first_named_entry(db=setup_db, name="6_qubit_setup_shfqc_calibrated") use_emulation = True

2. e-f Gate Tune-up¶

Sweep the pulse amplitude of a qubit drive pulse to determine the ideal amplitudes to drive qubit from excited to second excited state

• assumes that a pi-pulse to reach the e state is already calibrated

2.1 Define the Experiment¶

In [ ]:

## define pulses

# qubit pi pulse for first excited state
x180 = pulse_library.drag(uid="x180", length=23e-9, amplitude=0.5, sigma=0.3, beta=0.2)

# pulse to be calibrated for e-f transition - amplitude will be swept
ef_pulse = pulse_library.drag(
    uid="ef_pulse", length=32e-9, amplitude=1.0, sigma=0.3, beta=0.2
)

# readout drive pulse
readout_pulse = pulse_library.const(uid="readout_pulse", length=400e-9, amplitude=0.2)
# readout integration weights
readout_weighting_function = pulse_library.const(
    uid="readout_weighting_function", length=400e-9, amplitude=0.8
)

## define pulses # qubit pi pulse for first excited state x180 = pulse_library.drag(uid="x180", length=23e-9, amplitude=0.5, sigma=0.3, beta=0.2) # pulse to be calibrated for e-f transition - amplitude will be swept ef_pulse = pulse_library.drag( uid="ef_pulse", length=32e-9, amplitude=1.0, sigma=0.3, beta=0.2 ) # readout drive pulse readout_pulse = pulse_library.const(uid="readout_pulse", length=400e-9, amplitude=0.2) # readout integration weights readout_weighting_function = pulse_library.const( uid="readout_weighting_function", length=400e-9, amplitude=0.8 )

In [ ]:

# set up sweep parameter - drive amplitude
start = 0.1
stop = 1
count = 25
amplitude_sweep = LinearSweepParameter(
    uid="amplitude", start=start, stop=stop, count=count
)

# number of averages
average_exponent = 10  # used for 2^n averages, n=average_exponent, maximum: n = 17

# Create Experiment
exp_ef_gate = Experiment(
    uid="e-f Tuneup",
    signals=[
        ExperimentSignal("drive"),
        ExperimentSignal("drive_ef"),
        ExperimentSignal("measure"),
        ExperimentSignal("acquire"),
    ],
)
## experimental pulse sequence
# outer loop - real-time, cyclic averaging in standard integration mode
with exp_ef_gate.acquire_loop_rt(
    uid="shots",
    count=pow(2, average_exponent),
    averaging_mode=AveragingMode.CYCLIC,
    acquisition_type=AcquisitionType.INTEGRATION,
):
    # inner loop - real-time sweep of qubit drive pulse amplitude
    with exp_ef_gate.sweep(uid="sweep", parameter=amplitude_sweep):
        # qubit excitation - pulse amplitude will be swept
        with exp_ef_gate.section(
            uid="qubit_excitation",
            on_system_grid=True,
            alignment=SectionAlignment.RIGHT,
        ):
            exp_ef_gate.play(signal="drive", pulse=x180)
        with exp_ef_gate.section(
            uid="qubit_ef_excitation",
            play_after="qubit_excitation",
            on_system_grid=True,
            alignment=SectionAlignment.LEFT,
        ):
            exp_ef_gate.play(
                signal="drive_ef", pulse=ef_pulse, amplitude=amplitude_sweep
            )
        # qubit readout pulse and data acquisition
        with exp_ef_gate.section(uid="qubit_readout", play_after="qubit_ef_excitation"):
            # play readout pulse
            exp_ef_gate.play(signal="measure", pulse=readout_pulse)
            # signal data acquisition
            exp_ef_gate.acquire(
                signal="acquire",
                handle="ac_0",
                kernel=readout_weighting_function,
            )
        # relax time after readout - for signal processing and qubit relaxation to groundstate
        with exp_ef_gate.section(uid="relax"):
            exp_ef_gate.delay(signal="measure", time=100e-9)

# set up sweep parameter - drive amplitude start = 0.1 stop = 1 count = 25 amplitude_sweep = LinearSweepParameter( uid="amplitude", start=start, stop=stop, count=count ) # number of averages average_exponent = 10 # used for 2^n averages, n=average_exponent, maximum: n = 17 # Create Experiment exp_ef_gate = Experiment( uid="e-f Tuneup", signals=[ ExperimentSignal("drive"), ExperimentSignal("drive_ef"), ExperimentSignal("measure"), ExperimentSignal("acquire"), ], ) ## experimental pulse sequence # outer loop - real-time, cyclic averaging in standard integration mode with exp_ef_gate.acquire_loop_rt( uid="shots", count=pow(2, average_exponent), averaging_mode=AveragingMode.CYCLIC, acquisition_type=AcquisitionType.INTEGRATION, ): # inner loop - real-time sweep of qubit drive pulse amplitude with exp_ef_gate.sweep(uid="sweep", parameter=amplitude_sweep): # qubit excitation - pulse amplitude will be swept with exp_ef_gate.section( uid="qubit_excitation", on_system_grid=True, alignment=SectionAlignment.RIGHT, ): exp_ef_gate.play(signal="drive", pulse=x180) with exp_ef_gate.section( uid="qubit_ef_excitation", play_after="qubit_excitation", on_system_grid=True, alignment=SectionAlignment.LEFT, ): exp_ef_gate.play( signal="drive_ef", pulse=ef_pulse, amplitude=amplitude_sweep ) # qubit readout pulse and data acquisition with exp_ef_gate.section(uid="qubit_readout", play_after="qubit_ef_excitation"): # play readout pulse exp_ef_gate.play(signal="measure", pulse=readout_pulse) # signal data acquisition exp_ef_gate.acquire( signal="acquire", handle="ac_0", kernel=readout_weighting_function, ) # relax time after readout - for signal processing and qubit relaxation to groundstate with exp_ef_gate.section(uid="relax"): exp_ef_gate.delay(signal="measure", time=100e-9)

In [ ]:

# define signal maps for qubit 0
map_q0 = {
    "drive": device_setup.logical_signal_groups["q0"].logical_signals["drive_line"],
    "drive_ef": device_setup.logical_signal_groups["q0"].logical_signals[
        "drive_line_ef"
    ],
    "measure": device_setup.logical_signal_groups["q0"].logical_signals["measure_line"],
    "acquire": device_setup.logical_signal_groups["q0"].logical_signals["acquire_line"],
}
# ... - and qubit 1
map_q1 = {
    "drive": device_setup.logical_signal_groups["q1"].logical_signals["drive_line"],
    "drive_ef": device_setup.logical_signal_groups["q1"].logical_signals[
        "drive_line_ef"
    ],
    "measure": device_setup.logical_signal_groups["q1"].logical_signals["measure_line"],
    "acquire": device_setup.logical_signal_groups["q1"].logical_signals["acquire_line"],
}

# define signal maps for qubit 0 map_q0 = { "drive": device_setup.logical_signal_groups["q0"].logical_signals["drive_line"], "drive_ef": device_setup.logical_signal_groups["q0"].logical_signals[ "drive_line_ef" ], "measure": device_setup.logical_signal_groups["q0"].logical_signals["measure_line"], "acquire": device_setup.logical_signal_groups["q0"].logical_signals["acquire_line"], } # ... - and qubit 1 map_q1 = { "drive": device_setup.logical_signal_groups["q1"].logical_signals["drive_line"], "drive_ef": device_setup.logical_signal_groups["q1"].logical_signals[ "drive_line_ef" ], "measure": device_setup.logical_signal_groups["q1"].logical_signals["measure_line"], "acquire": device_setup.logical_signal_groups["q1"].logical_signals["acquire_line"], }

2.2 Run the Experiment and Plot the Pulse Sequence¶

In [ ]:

# set signal map to qubit 0
exp_ef_gate.set_signal_map(map_q1)

# create and connect to session
session = Session(device_setup=device_setup)
session.connect(do_emulation=use_emulation)

# run experiment on qubit 0
compiled_exp_ef_gate = session.compile(exp_ef_gate)
ef_gate_results = session.run(compiled_exp_ef_gate)

# set signal map to qubit 0 exp_ef_gate.set_signal_map(map_q1) # create and connect to session session = Session(device_setup=device_setup) session.connect(do_emulation=use_emulation) # run experiment on qubit 0 compiled_exp_ef_gate = session.compile(exp_ef_gate) ef_gate_results = session.run(compiled_exp_ef_gate)

In [ ]:

# Plot simulated output signals
plot_simulation(compiled_exp_ef_gate, 0, 10e-6)

# Plot simulated output signals plot_simulation(compiled_exp_ef_gate, 0, 10e-6)