half integer ell

[gdurkin]

So I am using this code to generate Wigner rotation matrices quickly -- but when I rotate a normalized ket with the matrix derived in this way it produces a new ket with the wrong normalization IF the ket is a half integer spin ket, e.g. a qubit or spin 3/2 particle. (everything is fine when the state has integer spin, ell = 1,2,3,..)

am i missing the code for the half-integer case?

[moble]

You're not using this code to generate Wigner rotation matrices. Are you talking about this code?

[gdurkin]

Thanks for the quick reply, I was using:

import quaternion
import spherical_functions as sf

def QuaternionRotMat(ell,aa,bb,cc,dd):
indices = []
R = np.quaternion(aa,bb,cc,dd).normalized()
indices = np.array([[ell,mp,m]
for mp in np.arange(-ell, ell + 1) for m in
np.arange(-ell, ell+ 1)])
mat = sf.Wigner_D_element(R, indices).reshape((2_ell + 1, 2_ell + 1))
return mat

On 20 January 2016 at 17:04, Mike Boyle notifications@github.com wrote:

You're not using this code to generate Wigner rotation matrices. Are
you talking about this https://github.com/moble/spherical_functions
code?

—
Reply to this email directly or view it on GitHub
#21 (comment).

Dr. Gabriel A. Durkin,
Senior Research Scientist
SGT, Inc.
and
Quantum Artificial Intelligence Laboratory (QuAIL)
at
NASA Ames Research Center
Moffett Field
CA 94035
USA
Tel: +1 626 993 4132
Email: gabriel.durkin@qubit.org
Web: http://www.nas.nasa.gov/quantum/durkin.html
http://www.nasa.gov/centers/ames/research/qpl/durkin-index.html
NASA QFT 1.0 Conference: http://quantum.nasa.gov

[moble]

This issue was moved to moble/spherical_functions#17

[moble]

This is an issue with the spherical_functions package, so I used the issue mover to move it there.

[gdurkin]

ok jolly good

On 20 January 2016 at 20:11, Mike Boyle notifications@github.com wrote:

This is an issue with the spherical_functions package, so I used the
issue mover https://github-issue-mover.appspot.com/ to move it there.

—
Reply to this email directly or view it on GitHub
#21 (comment).

Dr. Gabriel A. Durkin,
Senior Research Scientist
SGT, Inc.
and
Quantum Artificial Intelligence Laboratory (QuAIL)
at
NASA Ames Research Center
Moffett Field
CA 94035
USA
Tel: +1 626 993 4132
Email: gabriel.durkin@qubit.org
Web: http://www.nas.nasa.gov/quantum/durkin.html
http://www.nasa.gov/centers/ames/research/qpl/durkin-index.html
NASA QFT 1.0 Conference: http://quantum.nasa.gov