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QuTiP v4.3.1 Release Notes

Release Date: 2018-07-18 // almost 6 years ago

  • 🚀 The release of QuTiP 4.3.1

    👌 Improvements

    MAJOR FEATURE : Added the Permutational Invariant Quantum Solver (PIQS) module ( by Nathan Shammah and Shahnawaz Ahmed ) which allows the simluation of large TLSs ensembles including collective and local Lindblad dissipation. Applications range from superradiance to spin squeezing.

    MAJOR FEATURE : Added a photon scattering module ( by Ben Bartlett ) which can be used to study scattering in arbitrary driven systems coupled to some configuration of output waveguides.

    Cubic_Spline functions as time-dependent arguments for the collapse operators in mesolve are now allowed.

    Added a faster version of bloch_redfield_tensor, using components from the time-dependent version. About 3x+ faster for secular tensors, and 10x+ faster for non-secular tensors.

    Computing Q.overlap() [inner product] is now ~30x faster.

    ➕ Added projector method to Qobj class.

    ➕ Added fast projector method, Q.proj().

    Computing matrix elements, Q.matrix_element is now ~10x faster.

    Computing expectation values for ket vectors using expect is now ~10x faster.

    Q.tr() is now faster for small Hilbert space dimensions.

    Unitary operator evolution added to sesolve

    👉 Use OPENMP for tidyup if installed.

    🐛 Bug Fixes

    🛠 Fixed bug that stopped simdiag working for python 3.

    🛠 Fixed semidefinite cvxpy Variable and Parameter.

    🛠 Fixed iterative lu solve atol keyword issue.

    🛠 Fixed unitary op evolution rhs matrix in ssesolve.

    🛠 Fixed interpolating function to return zero outside range.

    🛠 Fixed dnorm complex casting bug.

    🛠 Fixed control.io path checking issue.

    🛠 Fixed ENR fock dimension.

    🛠 Fixed hard coded options in propagator 'batch' mode

    🛠 Fixed bug in trace-norm for non-Hermitian operators.

    Fixed bug related to args not being passed to coherence_function_g2

    🛠 Fixed MKL error checking dict key error