Release 2.4.0 · PsiQ/psiqdk

Released on: 2026-09-01

Package updates

Features

psiqdk-workbench

psiqdk.workbench.integrations.resource_analyzer: added draw(qc, kind=..., title=...), which renders a Resource Analyzer graph as an interactive widget in Jupyter notebooks. kind accepts "call_graph" (the default) or "flame_graph". (N.B. requires psiqdk-visualize to be installed.)
RossSelingerSynthesis now supports multi-qubit target registers for controlled rotations. Previously this was handled only by the single-control compilation filter, and calling the qubrick directly with a multi-qubit target raised an assertion; the qubrick and the filter now agree.
Qubrick now supports dagger=True for qubricks that leave qubits allocated at the end of compute(). This was previously forbidden.
Added a sparse state-vector simulation backend, >>sparse-sv-sim>>, for use in a QPU filter stack alongside >>witness>> and >>buffer>>.
Added preliminary, experimental simulation backends for Qiskit, PennyLane and QBlaze, exposed as the QISKIT_STATE_VEC, PENNYLANE_STATE_VEC and QBLAZE_SPARSE_STATE_VEC presets in psiqdk.workbench.filter_presets. These are native simulation filters rather than OpenQASM round-trips.

workbench-sim-native

psiqdk-workbench

RossSelingerSynthesis: for controlled rotations, error_param is now the error budget for each constituent single-qubit rotation, rather than a total budget divided across them. Previously the value was split (error_param / 2 for Rz, error_param / 3 for phase rotations). For an unchanged error_param, controlled rotations are now synthesized at looser per-gate precision, which lowers their T counts and active volume; pass a correspondingly smaller error_param to retain the previous overall accuracy.

psiqdk-workbench

psiqdk.workbench.qre.get_baseline_costs_from_witness and psiqdk.workbench.qre.get_active_volume_from_witness now raise a FutureWarning and will be removed in a future release. Use resource_estimator(qc).resources(expanded=True) and resource_estimator(qc).resources()["active_volume"] instead.

psiqdk-workbench

RossSelingerSynthesis: fixed incorrect synthesis of open-controlled (~ctrl) phase rotations.
Circuit Designer export: circuits containing nops or unnamed Qubits registers (those created via Qubits(N, qpu=qc) with no name) no longer fail to export. nops are now drawn as separators, and unnamed registers are correctly distinguished from registers the user explicitly named with an empty string.
Lowered the numpy floor for Python versions below 3.14. The minimum had been raised to numpy>=2.4.6 solely to gain Python 3.14 support, which unnecessarily prevented older numpy pins on earlier Python versions.

psiqdk-workbench