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[na] Let stage weight change the chosen schedule - #526
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A weighted layer keeps today's assignment unless moving one placed gate into a follow-up layer is a strictly cheaper section-9 cost. That lets rydberg_stage_weight change the verified stage count. Co-authored-by: Arnab Ghosh <ag2583@cornell.edu>
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The stage-count fixture turned movement weight on and off, so the long move was free under stage-only weights. Keep movement, transfer, and idle fixed and put the stage weight on either side of that cost. Co-authored-by: Arnab Ghosh <ag2583@cornell.edu>
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Summary
Next slice of issue 484. A weighted zoned layer can defer one placed gate into a later Rydberg stage when that is a strictly cheaper §9 cost.
rydberg_stage_weightthen changes which verified schedule is chosen. Movement, transfer, and idle weights already change a one-gate orientation; this slice is the stage-count choice.Issue 484 stays open.
What changed
PlacementCostModel::Weightedcompares keeping every placed gate against moving one gate into the follow-up layer. The split is taken only when the follow-up can place every deferred gate and the total is strictly lower.TimeandErrorBudgetschedules are unchanged. Placeholder weights still selectTime.Still open on issue 484
cost_modelfields, units, the canonical formula, and schema versioning.The resource report already records each component, weight, and total from the verified schedule.
Test
cargo test -p quon_na --features mlir --lib -- rydberg_stage_weight_selects changing_target_weights_selects