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Add Prod observable support #155

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Apr 17, 2024
Merged

Add Prod observable support #155

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2 changes: 1 addition & 1 deletion pennylane_rigetti/numpy_wavefunction.py
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Expand Up @@ -41,7 +41,7 @@ class NumpyWavefunctionDevice(RigettiDevice):
name = "pyQVM NumpyWavefunction Simulator Device"
short_name = "rigetti.numpy_wavefunction"

observables = {"PauliX", "PauliY", "PauliZ", "Hadamard", "Hermitian", "Identity"}
observables = {"PauliX", "PauliY", "PauliZ", "Hadamard", "Hermitian", "Identity", "Prod"}

def __init__(self, wires, *, shots=None):
super().__init__(wires, shots)
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3 changes: 2 additions & 1 deletion pennylane_rigetti/qpu.py
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Expand Up @@ -25,6 +25,7 @@
import numpy as np
from pennylane.measurements import Expectation
from pennylane.operation import Tensor
from pennylane.ops import Prod
from pennylane.tape import QuantumTape
from pyquil import get_qc
from pyquil.api import QuantumComputer
Expand Down Expand Up @@ -141,7 +142,7 @@ def expval(self, observable, shot_range=None, bin_size=None):
pauli_obs = sZ(wire)

# Multi-qubit observable
elif len(device_wires) > 1 and isinstance(observable, Tensor):
elif len(device_wires) > 1 and isinstance(observable, (Tensor, Prod)):
# All observables are rotated to be measured in the Z-basis, so we just need to
# check which wires exist in the observable, map them to physical qubits, and measure
# the product of PauliZ operators on those qubits
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2 changes: 1 addition & 1 deletion pennylane_rigetti/wavefunction.py
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Expand Up @@ -60,7 +60,7 @@ class WavefunctionDevice(RigettiDevice):
name = "Rigetti Wavefunction Simulator Device"
short_name = "rigetti.wavefunction"

observables = {"PauliX", "PauliY", "PauliZ", "Hadamard", "Hermitian", "Identity"}
observables = {"PauliX", "PauliY", "PauliZ", "Hadamard", "Hermitian", "Identity", "Prod"}

def __init__(self, wires, *, shots=None):
super().__init__(wires, shots)
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4 changes: 1 addition & 3 deletions tests/test_converter.py
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Expand Up @@ -1148,9 +1148,7 @@ def test_load_quil_file_via_entry_point(self):
cur_dir = os.path.dirname(os.path.abspath(__file__))

with OperationRecorder() as rec:
qml.from_quil_file(os.path.join(cur_dir, "simple_program.quil"))(
wires=range(5)
)
qml.from_quil_file(os.path.join(cur_dir, "simple_program.quil"))(wires=range(5))

# The wires should be assigned as
# 0 1 2 3 7
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