---
title: Qiskit addon utilities release notes
description: Changes made to Qiskit addon utilities
source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit-addon-utils/release-notes
---

# Qiskit addon utilities release notes

## 0.4.0

### New Features

- Enable new input format for the executor\_expectation\_values function - allow a tuple of observables and measurement bases instead of a dictionary that maps between each measurement basis and its relevant commuting observables. In case such a tuple is given as input, the mapping between the measurement bases and the relevant commuting observables is done internally in the function.

- Added the [`qiskit_addon_utils.noise_management.bit_flip_checks`](/docs/api/qiskit-addon-utils/noise-management-bit-flip-checks#module-qiskit_addon_utils.noise_management.bit_flip_checks "qiskit_addon_utils.noise_management.bit_flip_checks") sub-package for detecting samples likely corrupted by non-Markovian noise with bit-flip checks. Postselecting only samples which pass all checks can result in a higher-fidelity distribution of samples from the QPU. See the [guide](https://github.com/Qiskit/qiskit-addon-utils/blob/stable/0.4/docs/how_tos/postselection_with_bitflip_checks.ipynb) for more details.

## 0.3.1

### Bug Fixes

- Fixed bugs in [`qiskit_addon_utils.exp_vals.executor_expectation_values()`](/docs/api/qiskit-addon-utils/exp-vals#executor_expectation_values "qiskit_addon_utils.exp_vals.executor_expectation_values") causing indexing errors when bit\_array dimensions associated with twirling randomizations were not specified in avg\_axis.

## 0.3.0

### New Features

- Added a new sub-package, [`qiskit_addon_utils.exp_vals`](/docs/api/qiskit-addon-utils/exp-vals#module-qiskit_addon_utils.exp_vals "qiskit_addon_utils.exp_vals"), containing functions for calculating expectation values from the outputs of Qiskit Runtime’s new `Executor` primitive prototype. This includes:

  > - [`qiskit_addon_utils.exp_vals.executor_expectation_values()`](/docs/api/qiskit-addon-utils/exp-vals#executor_expectation_values "qiskit_addon_utils.exp_vals.executor_expectation_values") for expectation value calculation
  > - [`qiskit_addon_utils.exp_vals.get_measurement_bases()`](/docs/api/qiskit-addon-utils/exp-vals#get_measurement_bases "qiskit_addon_utils.exp_vals.get_measurement_bases") for identifying a minimal set of measurement bases to cover all terms in the observable.
  > - [`qiskit_addon_utils.exp_vals.map_observable_isa_to_canonical()`](/docs/api/qiskit-addon-utils/exp-vals#map_observable_isa_to_canonical "qiskit_addon_utils.exp_vals.map_observable_isa_to_canonical"), [`qiskit_addon_utils.exp_vals.map_observable_virtual_to_canonical()`](/docs/api/qiskit-addon-utils/exp-vals#map_observable_virtual_to_canonical "qiskit_addon_utils.exp_vals.map_observable_virtual_to_canonical"), and [`qiskit_addon_utils.exp_vals.map_observable_isa_to_virtual()`](/docs/api/qiskit-addon-utils/exp-vals#map_observable_isa_to_virtual "qiskit_addon_utils.exp_vals.map_observable_isa_to_virtual") for transforming the qubit order of Pauli observables.

- Added two new functions to the [`qiskit_addon_utils.noise_management`](/docs/api/qiskit-addon-utils/noise-management#module-qiskit_addon_utils.noise_management "qiskit_addon_utils.noise_management") sub-package:

  > - [`qiskit_addon_utils.noise_management.trex_factors()`](/docs/api/qiskit-addon-utils/noise-management#trex_factors "qiskit_addon_utils.noise_management.trex_factors") for calculating TREX readout error mitigation scaling factors
  > - [`qiskit_addon_utils.noise_management.gamma_from_noisy_boxes()`](/docs/api/qiskit-addon-utils/noise-management#gamma_from_noisy_boxes "qiskit_addon_utils.noise_management.gamma_from_noisy_boxes") for calculating the gamma factor for a given circuit and noise model.

## 0.2.0

### New Features

- Add the transpiler passes required to pre-process the circuits, as well as the `PostSelector` and `PostSelectionSummary` objects required to post-process the results.

### Upgrade Notes

- This addition requires bumping the version of Qiskit SDK to at least 2.0.

- This package is now compatible with Qiskit SDK 2.0.

### Bug Fixes

- Support circuits that include classical bits when slicing a circuit by gate types. See #115 \<[https://github.com/Qiskit/qiskit-addon-utils/issues/115](https://github.com/Qiskit/qiskit-addon-utils/issues/115)> for details.

### Other Notes

- This release adds support for Python 3.13. No code changes were necessary, so older releases are expected to work on Python 3.13 too.

## 0.1.0

### Upgrade Notes

- The keyword argument `include_slice_barriers` of [`combine_slices()`](/docs/api/qiskit-addon-utils/slicing#combine_slices "qiskit_addon_utils.slicing.combine_slices") has been renamed to `include_barriers`.