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Update minor comments in pulse sim tutorial to remove confusion #228

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Jun 7, 2023
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Update minor comments in pulse sim tutorial to remove confusion #228

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21 changes: 9 additions & 12 deletions docs/tutorials/qiskit_pulse.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -48,22 +48,19 @@ First, we use the pulse module in Qiskit to create a pulse schedule.
# Sample rate of the backend in ns.
dt = 1 / 4.5

# Define gaussian envelope function to have a pi rotation.
amp = 1.
area = 1
sig = area*0.399128/r/amp
# Define gaussian envelope function to approximately implement an sx gate.
amp = 1. / 1.75
sig = 0.6985/r/amp
T = 4*sig
duration = int(T / dt)
beta = 2.0

# The 1.75 factor is used to approximately get a sx gate.
# Further "calibration" could be done to refine the pulse amplitude.
with pulse.build(name="sx-sy schedule") as xp:
pulse.play(pulse.Drag(duration, amp / 1.75, sig / dt, beta), pulse.DriveChannel(0))
with pulse.build(name="sx-sy schedule") as sxp:
pulse.play(pulse.Drag(duration, amp, sig / dt, beta), pulse.DriveChannel(0))
pulse.shift_phase(np.pi/2, pulse.DriveChannel(0))
pulse.play(pulse.Drag(duration, amp / 1.75, sig / dt, beta), pulse.DriveChannel(0))
pulse.play(pulse.Drag(duration, amp, sig / dt, beta), pulse.DriveChannel(0))

xp.draw()
sxp.draw()


2. Convert the pulse schedule to a :class:`.Signal`
Expand All @@ -87,7 +84,7 @@ virtual ``Z`` gate is applied.

converter = InstructionToSignals(dt, carriers={"d0": w})

signals = converter.get_signals(xp)
signals = converter.get_signals(sxp)
fig, axs = plt.subplots(1, 2, figsize=(14, 4.5))
for ax, title in zip(axs, ["envelope", "signal"]):
signals[0].draw(0, 2*T, 2000, title, axis=ax)
Expand Down Expand Up @@ -146,7 +143,7 @@ and in this case should produce identical behavior.
# Start the qubit in its ground state.
y0 = Statevector([1., 0.])

%time sol = hamiltonian_solver.solve(t_span=[0., 2*T], y0=y0, signals=xp, atol=1e-8, rtol=1e-8)
%time sol = hamiltonian_solver.solve(t_span=[0., 2*T], y0=y0, signals=sxp, atol=1e-8, rtol=1e-8)


.. jupyter-execute::
Expand Down