Hey Hans, It's been a while since I have had any time to code for this, so the density operator stuff is nowhere near ready to be integrated into Sympy. The test suite I have put in place is pretty small, so I have not really validated the software. (Nor is the way I implement some things the way I would like)
With that warning in place, you can find the density operator code on my personal github repository under the branch 'density'. https://github.com/addisonc/sympy/tree/density It might be a good idea to wait for a Dr Brian Granger to respond, as he (or one of his new students) might have added some things to the code base since I last touched it. Cheers, Addison Cugini On Tue, Sep 20, 2011 at 7:49 AM, Hans Harhoff Andersen < [email protected]> wrote: > Ok, thanks I will wait for his reply then. > Mean while I found a working copy of the density operator function in > a github fork (repo of addisonc). It just sounded from the paper as if > it was included in Sympy already. > > Now I am stuck trying to use the represent method on the resulting > density operator to find out whether i can represent it in a nicer way > using another basis state. > > I am trying to use represent on a matrix with basis=the two basis > vectors, but it either throws exception or just outputs the input. how > do I input a correctly formatted basis? The example in the docstrings > uses an operator, but I do not have the corresponding operator just > the basis kets/vectors. > > Ideas, anyone? > > (I am hoping that be posing a lot of questions and providing at least > part of the answers here myself that this will serve as a guide for > others) > > -Hans > > On 20 Sep., 16:30, Ondřej Čertík <[email protected]> wrote: > > Hi Hans, > > > > On Tue, Sep 20, 2011 at 6:27 AM, Hans Harhoff Andersen > > > > <[email protected]> wrote: > > > that's ok. I found a way around the problem for now by manually typing > > > out explicitly what i mean. > > > whenever the quantum folks take a look at this I'd also like to aks > > > where the functions density and reduced_density are defined. (They are > > > mentioned in the paper by Cugini) but I can't find them in the version > > > of sympy I have 0.7.0 (I just downloaded the git version but I can't > > > find it there either). > > > > Thanks for your interest. The best is to ask Brian about this. I > > already sent him an email yesterday, so let's wait a few days. > > > > Ondrej > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/sympy?hl=en. > > -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
