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`HoareOptimizer` crashes with `ValueError: DAGOpNode is not in list`

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### Environment - **Qiskit version**: 2.1.2 - **Python version**: 3.13 - **Operating system**: MacOS 15.6 ### What is happening? Running `PassManager(HoareOptimizer())` on the cirucuit below crashes with: ``` ValueError: DAGOpNode(op=Instruction(name='cy',...

p51lee

Add feat(transpiler): add UnrollBoxes pass

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- Implement a new UnrollBoxes transpiler pass to replace BoxOp “scaffolding” with the gates from the boxed circuit body. - Support nested boxes via @trivial_recurse, so boxes inside boxes are...

debasmita2102

Fix timeline drawer for gates without unitary in target (backport #15421)

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### Summary The timeline drawer was storing the unitary of a gate from the target in the metadata collected around drawing properties for some reason. This field was never used...

mergify[bot]

Improve memory safety when writing to uninitialized buffers in C API

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# Description: Based on @jakelishman analysis and explanation here: https://github.com/Qiskit/qiskit/pull/15297#discussion_r2556111303, we should refactor the C API functions below to make writing data to uninitialized arrays safer. https://github.com/Qiskit/qiskit/blob/ea01d9985a0d9da1eeaaed3caace3fe11389e4f7/crates/cext/src/transpiler/transpile_layout.rs#L98 https://github.com/Qiskit/qiskit/blob/ea01d9985a0d9da1eeaaed3caace3fe11389e4f7/crates/cext/src/transpiler/transpile_layout.rs#L153 https://github.com/Qiskit/qiskit/blob/ea01d9985a0d9da1eeaaed3caace3fe11389e4f7/crates/cext/src/transpiler/transpile_layout.rs#L207

eliarbel

Simplify SabrePreLayout based on recent improvements to the VF2 search

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### Summary While reviewing/experimenting with Jake's recent improvements to `VF2` (especially the on-the-fly scoring mechanism and the revamp of `VF2Layout` and `VF2PostLayout` passes), I've realized that the (very expensive) extra...

alexanderivrii

QDrift C API Implementation

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### Summary This pull request implements QDrift Trotterization within the C circuit library. ### Details and comments As part of the implementation, some things were made public: `pauli_evolution` module from...

Didgety

Add methods to get active bits from QuantumCircuit

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### Summary This commit adds two new methods to QuantumCircuit to get the indices of active bits in the circuit. There was an existing rust space method to get a...

mtreinish

QAMP - Expose IQP circuit generator via C bindings

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**Title:** Expose IQP circuit generator via C bindings ## Summary This PR exposes the IQP circuit generator from `qiskit-circuit-library` through the C API and adds C tests for the new...

Ameya28Bhave

Bump ndarray from 0.16.1 to 0.17.1

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Bumps [ndarray](https://github.com/rust-ndarray/ndarray) from 0.16.1 to 0.17.1. Release notes Sourced from ndarray's releases. 0.17.1 Version 0.17.1 provides a patch to fix the originally-unsound implementation of the new array reference types. The...

dependabot[bot]

Add fixedbitset clifford for simd bitwise composition

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### Summary This commit adds a custom clifford implementation for the litinski transform that is simd optimized by using fixedbitset. This makes most of the operations operating on the clifford...

mtreinish