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qiskit

Builds, simulates, transpiles, and executes quantum circuits with Qiskit and IBM Quantum Runtime. Use for Qiskit 2.x circuits and operators, V2 Sampler or Estimator primitives, target-aware transpilation, local or noisy simulation, IBM QPU execution, Runtime sessions or batches, error mitigation, and Qiskit ecosystem packages.

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# Qiskit

Use current Qiskit 2.x APIs to build circuits, prepare hardware-compatible instruction set architecture (ISA) circuits, and execute them through V2 primitives.

Reviewed **2026-10-01** with local tests on `qiskit==2.5.2`, `qiskit-ibm-runtime==0.50.0`, and `qiskit-aer==0.17.2`. IBM account, QPU, session, and batch examples are illustrative and documentation/source-checked; no remote workloads were submitted. See [references/sources.md](references/sources.md) for the verification boundary.

Runtime 0.50 deprecates the top-level `SamplerV2`/`EstimatorV2` implementations. New code imports `Sampler` from `qiskit_ibm_runtime.executor_sampler` and `Estimator` from `qiskit_ibm_runtime.executor_estimator`. These still implement the V2 PUB interface, using client-side processing and `Executor`. Use option models from `qiskit_ibm_runtime.options_models`.

## Choose the Right Path

| Goal | Recommended interface |
|---|---|
| Ideal evolution with finite-shot sampling | `qiskit.primitives.StatevectorSampler` |
| Exact local expectation values | `qiskit.primitives.StatevectorEstimator` |
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