QuTiP 4.4.0
The release of QuTiP 4.4.0
Improvements
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MAJOR FEATURE: Added methods and techniques to the stochastic solvers (by Eric Giguère) which allows to use a much broader set of solvers and much more efficiently.
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MAJOR FEATURE: Optimization of the montecarlo solver (by Eric Giguère). Computation are faster in many cases. Collapse information available to time dependant information.
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Added the QObjEvo class and methods (by Eric Giguère), which is used behind the scenes by the dynamical solvers, making the code more efficient and tidier. More built-in function available to string coefficients. The coefficients can be made from interpolated array with variable timesteps and can obtain state information more easily. Time-dependant collapse operator can have multiple terms.
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New wigner_transform and plot_wigner_sphere function. (by Nithin Ramu).
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ptrace is faster and work on bigger systems, from 15 Qbits to 30 Qbits.
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QIP module: added the possibility for user-defined gates, added the possibility to remove or add gates in any point of an already built circuit, added the molmer_sorensen gate, and fixed some bugs (by Boxi Li).
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Added the quantum Hellinger distance to qutip.metrics (by Wojciech Rzadkowski).
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Implemented possibility of choosing a random seed (by Marek marekyggdrasil).
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Added a code of conduct to Github.
Bug Fixes
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Fixed bug that made QuTiP incompatible with SciPy 1.3.
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quite.cite() is improved.
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Added matplotlib as optional dependency and updated numpy and scipy requirements.
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Fixed matrix generating coherent spin states in qutip.piqs to include complex coefficients.