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2.0.0-dev (unreleased)

  • Changed: minimum supported Python version is Python 3.10 (drop support for Python 3.7-3.9)

1.3.0 (2024-06-03)

  • Bugfix: ∫gₐdt and total functional were reported incorrectly (#96, thanks to @daviehh)
  • Bugfix: Restrict qutip to version 4. Support for qutip 5.0 will be added in a later release
  • Changed: Dropped support for Python 3.5 and Python 3.6
  • Changed: The documentation will no longer be provided in PDF format
  • Changed: Development is now organized around hatch instead of tox

1.2.1 (2021-01-13)

  • Bugfix: Crash when initializing discretized numpy-array controls (#79, thanks to @loganbvh)
  • Bugfix: Corrected definition of co-states in Dissipative Qubit Reset example (#80, thanks to Alberto Castro)
  • Update: Switched Testing and Documentation deployment from Travis to Github Actions (#82)

1.2.0 (2020-08-17)

  • Added: via_midpoints argument to krotov.conversions.discretize function
  • Changed: Controls and update shapes are now discretized in a way that ensures numerical stability (#74, thanks to @zachmanson)
  • Changed: Replaced uniseg dependency with grapheme (#76)

Note: due to the changes in the time discretization of the controls and update shapes, this version will generally not reproduce optimization results from previous versions to machine precision.

1.1.0 (2020-03-24)

  • Added: Support for Python 3.8
  • Added: Support for QuTiP 4.5.0
  • Added: Support for parallelization with loky (#72)
  • Added: krotov.parallelization.set_parallelization function
  • Added: krotov.parallelization.parallel_map function (improved implementation of QuTiP's parallel_map)
  • Added: Ability to use threadpoolctl to limit unwanted threading
  • Added: limit_thread_pool option to krotov.optimize_pulses
  • Changed: krotov.propagators.expm now guarantees single-threaded execution

1.0.0 (2019-12-16)

  • Update: Citation info now points to SciPost paper (#61)
  • Added: parameters col_formats and col_headers to customize the output of krotov.info_hooks.print_table (#65)
  • Added: info-hooks now have access to the additional arguments propagator, chi_constructor, mu, sigma, iter_start, and iter_stop (#66)
  • Added: parameter keep_original_objectives to krotov.objectives.ensemble_objectives (#67)
  • Added: "Related Software" in the documentation
  • Update: Documentation is now hosted on gh-pages and deployed by Doctr (#68)

0.5.0 (2019-12-04)

  • Update: Documentation now contains all information from https://arxiv.org/abs/1902.11284v5
  • Added: Allow to pass args to time-dependent control functions (#56, thanks to @timohillmann)
  • Changed: Renamed krotov.structural_conversions to krotov.conversions
  • Bugfix: Crash when krotov.optimize_pulses is called with iter_stop=0 (#58)
  • Added: krotov.result.Result is now exposed at the top level of the API, as krotov.Result (#59, thanks to @nathanshammah)
  • Added: str-representation of krotov.result.Result now includes the total running time (#60, thanks to @nathanshammah)

0.4.1 (2019-10-11)

0.4.0 (2019-10-08)

  • Added: Support for Python 3.7
  • Changed: The 'shape' key in pulse_options was renamed to 'update_shape', to further avoid confusion between pulse shapes and update shapes.
  • Changed: The .adjoint property of Objective is now a method
  • Added: Ability to not use QuTiP Qobj objects, but arbitrary low-level objects instead.
  • Improved: Printing an Objective now uses internal counters and a symbolic notation to identify objects shared between different objectives. (#43)
  • Improved: gate_objectives now takes into account if target states are (reshuffled) basis states and does not create unnecessary new copies.
  • Bugfix: Two Objective instances that contain numpy arrays as controls can now be compared with == (#44)
  • Bugfix: Custom attributes (such as weight) are now preserved when copying an Objective (#44)
  • Bugfix: Calling copy.deepcopy on an Objective now preserves control functions (#44)
  • Improved: The Objective.mesolve and Objective.propagate methods can now receive arguments H and c_ops to override the respective attributes of the objectives. This make is easier to analyze perform a robustness analysis, where the result of an optimization should be propagated under a perturbed Hamiltonian.
  • Improved: The print_table and print_debug_information info-hooks now flush their output buffers after each iteration. As a result, when writing to a file, that file can be watched with tail -f.
  • Changed: Redefine tau_vals as their complex conjugate, fixing a bug in chis_ss and chis_sm (#46)
  • Bugfix: Correctly calculate ∂H/∂ϵ if ϵ occurs in H multiple times (#47, thanks to @uiofgh)
  • Bugfix: Correctly calculate ∂H/∂ϵ=0 if the specific ϵ currently being updated does not occur in H (#48)
  • Added: Method objectives_with_controls for Result object.

0.3.0 (2019-03-01)

  • Added: Preprint citation information (krotov.__arxiv__, krotov.__citation__, krotov.__bibtex__)
  • Added: Ability to continue from a previous optimization (#26)
  • Added: Parameter out to print_table info-hook
  • Added: Parameter finalize to Result.load
  • Added: Ability to dump optimization result every so many iterations (dump_result check-convergence routine)
  • Added: re-entrant option for DensityMatrixODEPropagator
  • Bugfix: Discretize controls to float values (#41)
  • Bugfix: Fix overlap for non-Hermitian operators (#39)
  • Bugfix: Interface for passing tau_vals to chi_constructor (#36)
  • Added: function above_value for convergence check (#35)

0.2.0 (2019-02-14)

  • Added: Implementation of all the standard functionals
  • Added: The info_hook receives additional information, including ∫gₐ(t)dt (#32)
  • Added: Initialization of objectives for gate optimization in Liouville space
  • Added: A new propagator DensityMatrixODEPropagator for faster density matrix propagation
  • Added: Support for "stateful" propagators by subclassing from krotov.propagators.Propagator
  • Changed: more flexibility for parallelization (#29)
  • Added: Support for the second-order pulse update
  • Changed: The options for the controls (λₐ, update-shape) are now passed through a simplified dict interface, instead of a custom PulseOptions class.

0.1.0 (2018-12-24)

  • Initial release with complete implementation of first-order Krotov's method
  • Support for state-to-state and gate optimization, for both closed and open systems