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[Enhancement] Shadow to use initial state for faster simulation #644

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[Enhancement] Shadow to use initial state for faster simulation #644

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38 changes: 28 additions & 10 deletions qadence/measurements/shadow.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@

from qadence.backend import Backend
from qadence.backends.pyqtorch import Backend as PyQBackend
from qadence.blocks import AbstractBlock, KronBlock, chain, kron
from qadence.blocks import AbstractBlock, KronBlock, kron
from qadence.blocks.block_to_tensor import HMAT, IMAT, SDAGMAT
from qadence.blocks.composite import CompositeBlock
from qadence.blocks.primitive import PrimitiveBlock
Expand All @@ -16,7 +16,7 @@
from qadence.measurements.utils import get_qubit_indices_for_op
from qadence.noise import NoiseHandler
from qadence.operations import H, I, SDagger, X, Y, Z
from qadence.types import Endianness
from qadence.types import BackendName, Endianness

pauli_gates = [X, Y, Z]
pauli_rotations = [
Expand Down Expand Up @@ -134,20 +134,38 @@
shadow: list = list()
all_rotations = extract_operators(unitary_ids, circuit.n_qubits)

initial_state = state
backend_name = backend.name if hasattr(backend, "name") else backend.backend.name
if backend_name == BackendName.PYQTORCH:
# run the initial circuit without rotations
# to save computation time
conv_circ = backend.circuit(circuit)
initial_state = backend.run(
circuit=conv_circ,
param_values=param_values,
state=state,
endianness=endianness,
)
all_rotations = [
QuantumCircuit(circuit.n_qubits, rots) if rots else QuantumCircuit(circuit.n_qubits)
for rots in all_rotations
]
else:
all_rotations = [

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QuantumCircuit(circuit.n_qubits, circuit.block, rots)
if rots
else QuantumCircuit(circuit.n_qubits, circuit.block)
for rots in all_rotations
]

for i in range(shadow_size):
if all_rotations[i]:
rotated_circuit = QuantumCircuit(
circuit.register, chain(circuit.block, all_rotations[i])
)
else:
rotated_circuit = circuit
# Reverse endianness to get sample bitstrings in ILO.
conv_circ = backend.circuit(rotated_circuit)
conv_circ = backend.circuit(all_rotations[i])
batch_samples = backend.sample(
circuit=conv_circ,
param_values=param_values,
n_shots=1,
state=state,
state=initial_state,
noise=noise,
endianness=endianness,
)
Expand Down
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