Symbol θ

The passage around this formula

…survive, recombine, or get discarded, with the cycle repeating across generations. Read against that schema, the variational loop’s mapping is direct rather than metaphorical in its outline: the parameter vector $\theta$ is a genotype; the measured expectation value E($\theta$) is a fitness score, evaluated by a fitness oracle that happens to require physical qubits rather than a spreadsheet; and the classical update rule is a selection-and-variation operator proposing the next candidate.

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