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Derive the second amplitude's parity sign from the first using a mask-dependent sign computed outside the hot loop. On a 12-qubit, 20-step dynamics benchmark, this reduces CPU cycles by an average of 4.06% across three paired runs. Numerical output is byte-identical to the reference. Eight relevant Pauli-operation tests pass. Co-authored-by: ChatGPT <chatgpt@openai.com>
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Summary
Compute the parity relationship between paired amplitudes once, outside the hot loop.
Since iB = iA ^ maskXY, the second parity sign can be derived from the first using a precomputed mask-dependent sign. This eliminates one parity calculation per amplitude pair.
Performance
12-qubit, 20-step dynamics benchmark, serial CPU, three paired runs:
Validation