Jake Lishman

Move QPY tests to GitHub Actions and increase inter-symengine tests

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### Summary This commit has two major goals: - fix the caching of the QPY files for both the `main` and `stable/*` branches - increase the number of compatibility tests...

`box` is a simple control-flow operation, so there's very little complexity here. The tests of Qiskit `main` will fail until Qiskit/qiskit#13869 is merged to Qiskit.

`token_swapper` to accept generic map-and-support for target description

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### What is the expected enhancement? Currently `token_swapper` requires a `HashMap` to define the partial mapping that the token swapper is meant to effect. This is fine, but `token_swapper` takes...

`token_swapper` to return its swaps as `(G::NodeId, G::NodeId)` rather than `NodeIndex`

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### What is the expected enhancement? This would be a breaking change to the interface, but `token_swapper` currently returns `(NodeIndex, NodeIndex)` as its swaps for a graph `g: impl NodeIndexable`...

Rewrite Sabre interfaces to be Rust native

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### Summary From a pure-Rust interface perspective, there are several things going on here, ticks indicate whether they're done or not: - [x] Move all descriptions of the routing target...

Fix Sabre extended-set tracking

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### Summary This fixes the logic bug in extended-set tracking where the "other" qubit of a gate touched by a swap would not have its tracking data updated during an...

Collapse Sabre nodes with no routing implications

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### Summary Not all nodes in the `SabreDAG` actually imply additional routing constraints. For example, a 2q gate immediately following a prior 2q gate on the same qubits doesn't need...

Raise an error on multi-qubit gates in `SabreSwap`

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### Summary The documented behaviour of `SabreSwap` is that we assume that multi-qubit gates have already been decomposed. Previously, we silently ignored multi-qubit gates, most likely because this initial handling...

Compute dense-layout Sabre trial only over virtual qubits

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### Summary The previous Sabre implementation, when it used the Python-space disjoint handling, would always see incoming `DAGCircuit` objects as being already full-width on the chip subset. This meant that...

Support simple `IfElseOp` conditionals in OpenQASM 2 export

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### Summary With the removal of `Instruction.c_if` in gh-13506, we lost the ability to export the sort of simple conditionals that OpenQASM 2 can represent. This restores the ability, for...