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Modify models.encodings.hamming_weight_encoder to upload data in the lexicographical order #1572

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merged 4 commits into from
Feb 3, 2025
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Modify models.encodings.hamming_weight_encoder to upload data in the lexicographical order #1572

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2e5d720
lexicographical order
renatomello Feb 3, 2025
d3d4134
fix test
renatomello Feb 3, 2025
7c00b7e
removed commented lines
renatomello Feb 3, 2025
cf99513
short one liner
renatomello Feb 3, 2025
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9 changes: 9 additions & 0 deletions src/qibo/models/encodings.py
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Original file line number Diff line number Diff line change
Expand Up @@ -371,6 +371,15 @@ def hamming_weight_encoder(
initial_string = np.array([1] * weight + [0] * (nqubits - weight))
bitstrings, targets_and_controls = _ehrlich_algorithm(initial_string)

# sort data such that the encoding is performed in lexicographical order
bitstrings_lexicographical = list(zip(bitstrings, range(len(bitstrings))))
bitstrings_lexicographical.sort()
bitstrings_lexicographical = np.asarray(bitstrings_lexicographical)
lexicographical_order = list(bitstrings_lexicographical[:, 1].astype(int))
bitstrings_lexicographical = list(bitstrings_lexicographical[:, 0])
data = data[lexicographical_order]
del bitstrings_lexicographical

# Calculate all gate phases necessary to encode the amplitudes.
_data = np.abs(data) if complex_data else data
thetas = _generate_rbs_angles(_data, nqubits, architecture="diagonal")
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