Qiskit/qiskit 2.6.0rc1

Qiskit 2.6.0rc1

on GitHub

Added

• Define Custom Operations via the C API (#16549)
• Add base implementation of LoweringPassManager (#17105)
• Define Pass and PassContext handles for Python (#17104)
• Add implementation of IR handle extraction (#17103)
• Define Python API for Rust-native PassManager (#17089)
• Add Delay with units of Dt to the C API (#16915)
• Expose the pass manager to C (#16839)
• Add VtableEntry to C API (#17055)
• Centralise dynamic-typing subsystem (#17050)
• Add MCTS to default HLS synthesis plugin for PauliEvolution gates (#16879)
• QPY: C API (#16881)
• Add access to QkParam types from the C API (#16936)
• A pass manager in Rust (#16820)
• feat(dagcircuit): allow DAGCircuit.op_nodes to accept iterable of operation types (#16552)
• Add dirty-ancilla Maslov MCX synthesis (#16815)
• Add non-allocating instruction views to C API (#16798)
• Implement SparseObservable.to_matrix (#16809)
• Add ParameterExpression.structurally_equal via SymbolExpr::eq_exact (#16952)
• Implement MCTS algorithm for synthesizing PauliEvolution gates (#16581)
• QPY 18: store each ParameterVector once and reference it by index (#16846)
• Add barrier label rendering with barrier_label_len to the Rust circuit drawer (#16598)
• feat: add qk_obs_with_capacity (#16889)
• Update Register pack for QPY v18 (#16813)
• Improved synthesis of MCXGate without ancillas (#16693)
• Allow null pointer in qk_circuit_barrier (#16797)
• Expose n_local to C API (#16295)
• New efficient decomposition of MCPhaseGate (#16550)
• Synthesize controlled RCCX with an exact compact decomposition (#16657)
• Parameter label added to all QuantumCircuit gate-methods that produce a single gate (#16373)
• Make a shallow copy of metadata in QuantumCircuit <> DAG conversion (#16142)
• Rewrite OpenQASM 2 expression parser as iterative (#16425)
• Allow transpile() to accept a Target as the backend positional argument (#15954)
• Use ParameterExpression.numeric() in SparsePauliOp.simplify (#16345)

Fixed

• Raise ValueError when BitArray samples do not fit in num_bits (#17123)
• Preserve seeded pass-manager qubit metadata (#16827)
• Fix divide by zero in QDrift.expand (#17117)
• Leave unitaries unchanged when UnitarySynthesis has no basis or target (#16944)
• Make null-freeing uniform across the C API qk_*_free functions (#17067)
• QPY ancilla registers handling (#16836)
• Rename identifiers colliding with OpenQASM 3 built-in constants (#16183)
• Fix star-import of qiskit.visualization (#17008)
• Fix potential panics in QPY deserialization on malformed payloads (#16973)
• Fix: CouplingMap storing parallel edges (#16988)
• Avoid hard allocation abort from QPY provided sizes (#16966)
• Fix GIL deadlock in CommutationAnalysis with Python-defined gates (#16963)
• Fix Litinski transformation on PPR with 32+ qubits (#16950)
• Fixed HighLevelSynthesis qubit tracking for if-then-else instructions (#16896)
• Apply to_instruction parameter_map to definition.global_phase (#16234)
• Fix BlueprintCircuit.compose to respect inline_captures (#16538)
• fix(transpiler): preserve layout in OptimizeSwapBeforeMeasure (#16920)
• Fix identity one-qubit gates in the U and U3 Euler bases (#16834)
• Accumulate add/sub in SymbolExpr on the fly (#16753)
• fix template optimization bug (#10151)
• Bug-Fix: BarrierBeforeFinalMeasurements can reorder measurements sharing the same Clbit and change circuit semantics (#16900)
• Fix ParameterExpression equality for inverse vs negative power (#16840) (#16883)
• Keep identical summands when running FindCommutingPauliEvolutions. (#16892)
• Implement Drop for SymbolExpr iteratively (#16775)
• Port synth_cnot_phase_aam to Rust (#12937)
• Fix DAGCircuit.__eq__ with Unitary, PPRs and PPMs (#16826)
• Fixed Litinski transformation on PPMs with negative phases (#16880)
• Fix spurious clone on SparsePauliOp.to_matrix(sparse=False) (#16828)
• QPY: Bug fix in Rust implementation of SparsePauliObservableElemPack (#16788)
• Preserve MCPhase parameters in MCX synthesis (#16781)
• Reject multi-qubit Solovay-Kitaev basis gates (#16718)
• Sum VF2Layout average errors in a deterministic order (#16732)
• Fix add/sub optimizations including the same symbols (#16752)
• Reimplement SymbolExpr::eval to be iterative (#16756)
• dagcircuit: transfer DAG-level variables in substitute_node_with_dag (#15542)
• Fix memory leak in Suzuki-Trotter synthesis (#16687)
• Fix OptimizeCliffordT producing non-unitarily-equivalent output when basis excludes sx/sxdg (#16729)
• Fix potential panic in DAGCircuit.depth by bumping rustworkx-core to 0.18.1 (#16686)
• Parameter expression bugfixes (#16283)
• Update to rsgridsynth 0.2.2 (#16685)
• Consistent identity removal for ConsolidateBlocks (#16082)
• Preserve StatePreparation width in inverse (#16431)
• Fix circuit drawing layer overlaps inside of ControlFlowOps (#16639)
• Fix non-determinism in DAGCircuit::remove_qubits (#16656)
• Fix serial_layers global phase copying (#16362)
• Fix deadlock in Optimize1qGatesDecomposition (#16592)
• Fix transpiler error message with routing_pass when layout_trials or swap_trials is set (#16637)
• Clarify error message about gate missing from WrapAngleRegistry (#16633)
• Fix sx resynthesis of negative angles in CommutativeCancellation (#16599)
• Use target error rates when selecting Euler basis in Optimize1qGatesDecomposition (#16575)
• Fix commuting2q block parameter preservation (#16459)
• Fix tautological boolean oracle synthesis (#16530)
• fixes #11393 sampled_expectation_value returning incorrect results for complex coefficients (gave 0.0 rather than 1j) (#16443)
• Fix OverflowError in QuantumCircuit.for_loop for negative integers in list indexset (#16432)
• Fix Initialize.gates_to_uncompute for integer inputs (#16492)
• Fix incorrect global phase shift for P and U1 gates in CommutativeCancellation (#16402)
• Fix qasm3 experimental exporter delay units for ms and ps (#16233)

Changed

• Add Delay with units of Dt to the C API (#16915)
• Disable multiprocessing by default on Linux (#16904)
• Add Param::Int variant for Dt in Rust. (#16768)
• OQ2 import: Move custom-instruction expression evaluation fully into Rust (#16697)
• Split PyDAGCircuit and DAGCircuit (#16471)
• QPY: make custom gate names deterministic (#16843)
• Narrow QPY 18 SPARSE_OBSERVABLE bit terms from uint16_t to uint8_t (#16800)
• QPY 18: give the register/clbit payload a tag byte instead of a "\x00"-prefixed string (#16765)
• Qpy v18 big endian (#16707)

Build System

• Bump MSRV to 1.89 (#16603)
• Bump setuptools-rust to 1.13 (#16500)

Performance

• Faster Heisenberg-frame evolution of Paulis by Clifford (#16842)
• Migrate synth_mcx_{1,2}_kg24 to Rust (#16783)
• speed up case of BasePauli._evolve_clifford (#16835)
• Port synth_mcx_noaux_sp22 to Rust (#16818)
• Port synth_cnot_phase_aam to Rust (#12937)
• Allow calloc-like optimisations in SparsePauliOp allocations (#16830)
• Port synth_mcp_noaux_sp22 to Rust (#16755)
• Port the Quantum Fourier Transform (QFT) all-to-all implementation to Rust (#16789)
• Allow null pointer in qk_circuit_barrier (#16797)
• Migrate synth_mcx_n_clean_m15 to Rust (#16703)
• Migrate synth_mcx_1_clean_b95 synthesis to Rust (#16710)
• Remove redundant name check when adding QuantumCircuit registers. (#16678)
• Simplify optimization loops in Clifford+T pass manager (#16406)
• Fix cache and prediction misses in Target::qargs (#16476)