19 lines
500 B
Python
19 lines
500 B
Python
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"""party_blocks.py -- extract the raw (unnormalized) single-party-to-single-party 3x3
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correlation blocks M_{a->b} from the Pauli correlation tensor."""
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import numpy as np
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def party_block(C, a, b):
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M = np.zeros((3, 3))
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for i, ia in enumerate([1, 2, 3]):
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for j, ib in enumerate([1, 2, 3]):
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idx = [0, 0, 0, 0]
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idx[a] = ia
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idx[b] = ib
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M[i, j] = C[tuple(idx)]
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return M
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def nuc(M):
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return np.linalg.svd(M, compute_uv=False).sum()
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