Changelog

The format is based on Keep a Changelog, and uses Semantic Versioning.

[1.2.0] - 2026-05-22

Added

  • Rigetti Cepheus 108Q support via Amazon Braket.

  • Auxiliary energy contributions (DFT mean-field energies) for projective embedding problems.

  • Active electrons correlation energy property added on GroundStateProblemCalculatorResult

  • Verification that hardware backends function correctly on creation of a backend sampler or estimator.

  • Data persister support for the Configuration Interaction calculator.

  • Improved default for RI/Auxiliary basis sets.

  • VQE warm start utilities for starting VQE calculations from a previous result, a custom circuit, or a parameterized circuit.

Changed

  • Upgraded Qrunch to Python 3.12.

Fixed

  • Fixed measurement result bit ordering for IQM backends.

  • Fixed memory leak in RI integral evaluation.

  • Fixed support for Amazon Braket Hybrid Jobs.

[1.1.0] - 2026-03-03

Added

  • BEAST-PT2 (Second-Order Correction for BEAST-VQE)

    BEAST-VQE can now be augmented with a second-order perturbative correction to improve accuracy beyond the paired-electron approximation. The correction supports pair-breaking effects, single excitations, or both, and can be enabled directly in the calculator configuration.

  • Noisy Memory Restricted Simulator

    A new memory-restricted simulator can emulate physical quantum hardware, including user configured device data. It combines the standard memory restricted simulator with Monte Carlo sampling, to emulate hardware-like behavior based on calibration data.

  • GPU Acceleration

    We introduced a new GPU acceleration module with initial support for accelerated orbital rotations, providing improved performance for selected workflows.

  • Hardware Backend Improvements

    • Support for IBM NightHawk architecture devices (e.g., Miami).

    • Optional instance selection for IBM Quantum Platform backends.

    • Improved robustness of IQM backends when handling missing qubits or calibration data.

  • Performance Improvements

    • Faster mapping from second-quantized Hamiltonians to Pauli operators.

    • Performance improvements for FAST-VQE and BEAST-VQE workflows.

    • Reduced logging overhead in the memory-restricted simulator.

Deprecated

  • Tensor Hypercontraction integrals have been deprecated as it never worked to our satisfaction and it will be removed in a future release.

Fixed

  • Fixed a performance issue in even-handed projective-embedding calculations.