QuTiP 4.2.0 released July 28th, 2017.

[Paul Nation]

We are proud to announce the release of QuTiP 4.2.  This release include the initial implimentation of a time-dependent Bloch-Redfield solver, as well as several performance improvements and bug fixes.  The new version is available via conda or the qutip.org website.

Improvements

• MAJOR FEATURE: Initial implementation of time-dependent Bloch-Redfield Solver.
• Qobj tidyup is now an order of magnitude faster.
• Time-dependent codegen now generates output NumPy arrays faster.
• Improved calculation for analytic coefficients in coherent states (Sebastian Kramer).
• Input array to correlation FFT method now checked for validity.
• Function-based time-dependent mesolve and sesolve routines now faster.
• Codegen now makes sure that division is done in C, as opposed to Python.
• Can now set different controls for a each timeslot in quantum optimization.
• This allows time-varying controls to be used in pulse optimisation.

Bug Fixes

• rcsolve importing old Odeoptions Class rather than Options.
• Non-int issue in spin Q and Wigner functions.
• Qobj’s should tidyup before determining isherm.
• Fixed time-dependent RHS function loading on Win.
• Fixed several issues with compiling with Cython 0.26.
• Liouvillian superoperators were hard setting isherm=True by default.
• Fixed an issue with the solver safety checks when inputing a list with Python functions as time-dependence.
• Fixed non-int issue in Wigner_cmap.
• MKL solver error handling not working properly.

[Kevin Fischer]

Hi Paul,

Thanks so much for all your great work on this release, especially on the time-dependent Bloch-Redfield Solver! I look forward to using it :)

I also wanted to direct attention to a QuTiP notebook tutorial, which shows how this new solver can be used for understanding dissipative initialization of two-level systems (just created a PR on the qutip-notebooks repository). It's based on some of my previous work that might be helpful for the community in understanding how to apply this solver.

Regards,

Kevin

[Kevin Fischer]

Sorry, forgot to include a link to the notebook on my forked repository.

Kevin

[Paul Nation]

Hey Kevin,

Good to hear from you again.  Just had a look at the notebook, and as usual, it looks very good.  It is not so easy to find papers on time-dependent Bloch-Redfield, so your contribution is most welcomed.  Given that you are submitting a notebook rather than a bug report, I am guessing that the solver is working as it should.  That makes me even more happy.

Thanks again!

Cheers,

Paul

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[Paul Nation]

Kevin,

I should also say thanks for the other notebook as well.  I should have them up with the rest of the tutorials on Sunday.

-Paul

On Aug 4, 2017, at 18:53, Kevin Fischer <fischer...@gmail.com> wrote:

[Kevin Fischer]

Hi Paul, I can't seem to find them - did you have a chance to put them up?

Thanks!

Kevin

[Paul Nation]

Kevin,

It seems I put them up on the users page but not the tutorial page.  Will fix ASAP.

I also modified the td BR example a bit.  Reusing the rhs function makes it much much faster.

-Paul

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[Paul Nation]

Added.

-P

[chus...@yahoo.com.tw]

Hi, 

Thank you for so good material. 

I tried to install and operate with notebook, but showed a error message below that means qutip.version is not correct. Can you help to fix it. Thank you 

=====================================================

# setup the matplotlib graphics library and configure it to show 

# figures inline in the notebook

%matplotlib inline

import matplotlib.pyplot as plt

import numpy as np

# make qutip available in the rest of the notebook

from qutip import *

Traceback (most recent call last):

  File "<ipython-input-2-97f6f10d2c40>", line 2, in <module>

    from qutip import *

  File "C:\Users\cchang\qutip\__init__.py", line 39, in <module>

    import qutip.version

ModuleNotFoundError: No module named 'qutip.version'   

=======================================================

On Friday, July 28, 2017 at 12:43:40 PM UTC-7, Paul Nation wrote:

[Paul Nation]

You are probably in the install directory.

-P

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[azim1...@gmail.com]

Hi Paul, I just installed qutip in anaconda prompt, "conda install qutip", but as i run the python codes, i cant find the qutip.tr() and qutip.conj() for trace and conjugate purpose. 

Attached is the proof

[Paul Nation]

Because they are methods of the Qqobj class

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