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Fix tutorial_pulse_programming101.py to type cast expval #1317

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merged 4 commits into from
Feb 14, 2025
Merged

Fix tutorial_pulse_programming101.py to type cast expval #1317

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c7a9f53
add fix
andrijapau Feb 14, 2025
8ce2231
remove interface=jax
andrijapau Feb 14, 2025
9859886
explain what were doing
andrijapau Feb 14, 2025
ef9343f
Trigger CI
andrijapau Feb 14, 2025
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2 changes: 1 addition & 1 deletion demonstrations/tutorial_pulse_programming101.metadata.json
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@
}
],
"dateOfPublication": "2023-03-08T00:00:00+00:00",
"dateOfLastModification": "2024-10-07T00:00:00+00:00",
"dateOfLastModification": "2025-02-14T00:00:00+00:00",
"categories": [
"Quantum Hardware",
"Quantum Computing"
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14 changes: 10 additions & 4 deletions demonstrations/tutorial_pulse_programming101.py
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Expand Up @@ -325,11 +325,17 @@ def wrapped(p, t):

dev = qml.device("default.qubit", wires=range(n_wires))

@qml.qnode(dev, interface="jax")

def qnode(theta, t=duration):
qml.BasisState(jnp.array(data.tapered_hf_state), wires=H_obj.wires)
qml.evolve(H_pulse)(params=(*theta, *theta), t=t)
return qml.expval(H_obj)

@qml.qnode(dev)
def _qnode_inner(theta, t=duration):
qml.BasisState(jnp.array(data.tapered_hf_state), wires=H_obj.wires)
qml.evolve(H_pulse)(params=(*theta, *theta), t=t)
return qml.expval(H_obj)

expectation_value = _qnode_inner(theta, t) # Execute the qnode
return jnp.real(expectation_value) # Extract real part


value_and_grad = jax.jit(jax.value_and_grad(qnode))
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