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Ran 15 Aug 2025 05:28PM UTC

Files 839

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Committed 15 Aug 2025 04:12PM UTC coverage: 88.285% (+0.005%) from 88.28%

Job # 16994827085.1

Build Type

push

github

Committed by

web-flow

Commit Message

Fix composition of `final_layout` (#14919)

The previous implementation had it backwards.  There are two ways to
think about the `final_layout`, which is a `Layout` object mapping
"virtual" objects (qubits at the start of the circuit) to "physical"
indices (qubits at the end of the circuit):

- It is a "goes to" permutation that you would _prepend_ to the
  _unrouted_ circuit to have the same effect as routing.

- It is a "comes from" permutation that you would _append_ to the
  _routed_ circuit to undo the effects of routing.

If you have permutation `A` that is already applied, and you're newly
applying permutation `B`, then in the first interpretation, you want to
transform
    A and then (B and then circuit)
into
    (A and then B) and then circuit.

In the second interpretation, you instead want to turn
    (circuit then "undo B") then "undo A"
into
    circuit then ("undo B" then "undo A")

The composition "undo B then undo A" is the same as "undo (A then B)"
by standard inverse rules.

In both cases, the logic is implemented as `previous.compose(new)` in
terms of `Layout.compose`.

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