qutip/qutip: QuTiP 5.2.0

Features

Improvements to Environment

• Two 'DrudeLorentzPadeBath' can be added with complex conjugate 'gammas' to create a Shifted-DrudeLorentzPadeBath. (#2574, by Akhil Bhartiya)
• Adds extra fitting methods (power spectrum, prony, esprit, aaa, espira-I, espira-II) for bosonic environments (#2594, by Gerardo Jose Suarez)
• Add support for FermionicEnvironment in Bloch Redfield tensor and solver. (#2628)

New experimental solver

• Add a first version of Dysolve solver as dysolve_propagator. A perturbation solver for Schrödinger equation optimized for driven systems. (#2648, #2679, by Mathis)

Better matrix format control

• Add "default_dtype_scope" option. Add dtype to Qobj initialization method. Give more control on matrix format used by operations. (#2519)
• Creating operator from dense ket.proj return CSR when appropriate (#2700)
• |ket> @ <bra| create sparse matrix per default. (#2611)
• Tensor product of sparse and dense matrices return sparse matrix per default. (#2391)

Other improvements

• Add the calculation of the third cumulant to the functions of countstat.py. I use a result of "Electrons in nanostructures" C. Flindt, PhD Thesis (#2435, by Daniel Moreno Galán)
• Support pretty-printing of basis expansion for states (e.g. (0.5+0j) |0010> + ...). (#2620, by Sola85)
• Added QuTiP family package information to qutip.about(). The information is provided by a new QuTiP family package entry point. (#2604)
• Speed up ptrace for kets (by several orders of magnitude for large states). (#2657, by Sola85)
• Implement partial trace and tensor product for states in excitation-number restricted space. (#2696, magzpavz)

Bug Fixes

• Fix arc behind hidden behind the wireframe. (#2467, by PositroniumJS)
• Update mkl finding to support the 'emscripten' sys.platform. (#2606)
• Make sure that dims of rand_ket output are set correctly. (#2613, reported by Mário Filho)
• Allow np.int as targets in expand_operator (#2634, by Sola85)
• Fix coefficient args not being properly updated when initiated from another coefficient. (#2646, reported by Kyle Wamer)
• Fix equality operators for diagonal format Qobj. (#2669, reported by Richard Dong)
• Enable again to plot a state as a point on the Bloch sphere with a RGBA tuple. Enable to do the same as a vector. (#2678, by PositroniumJS)
• Added missing abs when checking hermiticity (#2680, by Tanuj Rai, reported by tuureorell)
• Fix types and exceptions (#2701, Emmanuel Ferdman)

Documentation

• Docstrings, typing, guide page for distributions. (#2599, by Mathis)
• Guide for qutip.distributions (#2600, by Mathis)
• Removes the Quantum Optimal Control page in the Users Guide and adds Family guide page in Users guide. (#2616, by Kavya Rambhia)
• Fix small typo in docstring for sesolve. (#2677, by Sarang Joshi)

Miscellaneous

• Removed WignerDistribution, QDistribution from distributions with their tests. Added plot_qfunc to plot Husimi-Q function with tests and animation. (#2607, by Mathis)
• Specialized A @ B.dag() operation. (#2610)
• Set auto_tidyup_dims default to True (#2623)
• Change default ode method for mcsolve (#2643)
• Fix parameter name inconsistency in qsave (#2688, by Andrey Rakhubovsky)
• Add tests for qdiags and phasegate Hermitian fix (#2698, by Tanuj Rai)
• Changed type hints in function visualize in distributions.py (tests failed if mpl not installed). (#2607, by Mathis)