Okay, I really like the idea of factory functions and a single State
class because (to the best of my knowledge) someone could do something
like:
>>> ket = Ket('beta')
>>> ket
|beta>
The Ket factory function would hand State the name as well as ket=True
and return a State instance or something like that. I think this would
be important for any kind of basic to midrange user's intuition
(rather than just knowing what dictionary keys to pass to State).
On Jul 17, 4:11 am, Øyvind Jensen <jensen.oyv...@gmail.com> wrote:
> fr., 16.07.2010 kl. 13.25 -0700, skrev Brian Granger:
>
>
>
>
>
> > Hi,
>
> > Currently in secondquant and quantum we are making Bra and Ket
> > subclasses of State:
>
> > class State(Expr):
> > class Bra(State):
> > class Ket(State):
>
> > the other option would be to make the ket/bra-ness an option:
>
> > bra = State('alpha', bra=True)
>
> > The advantage of this approach is that things like dagger can
> > automatically know how to build the bra or ket from the ket or bra,
> > without having to know what the appropriate class is. Also, the
> > inheritance diagram for states is getting to be pretty messy when we
> > introduce TensorProducts and this keeps it simple. We could still
> > have Bra/Ket factory functions that build State instances with the
> > right options. Thoughts?
>
> I don't see any problems with the approach you suggest, but your
> question inspired me to think a bit about dual states.
>
> Another approach entirely is to consider bra states as *operators*, and
> not states at all. I've seen some texts treating bras as operators
> mapping kets to the complex plane (as opposed to the usual operators
> mapping kets to kets.). I don't know exactly where that would lead with
> respect to a Sympy implementation, but it could be worth to consider it.
> I don't have strong opinions about this, I just wanted to share my
> thoughts.
>
> Cheers,
>
> Øyvind
>
>
>
>
>
> > Brian
>
> > --
> > Brian E. Granger, Ph.D.
> > Assistant Professor of Physics
> > Cal Poly State University, San Luis Obispo
> > bgran...@calpoly.edu
> > elliso...@gmail.com
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