Re: something about using Dicke.states

[Nathan Shammah]

Hi NI, 

If you are interested only in the symmetric subspace with j=N/2, you can use the `jmat` functions, https://qutip.org/docs/latest/apidoc/functions.html#qutip.operators.jmat.

The piqs module is only for the study of (homogeneous) local dissipation mechanisms, which mix `j`. If your total spin length is fixed, you can use the jmat functions that span a space of size (N+1).

Here is a tutorial illustrating the use of different spin operators in the:

- full 2^N space, `uncoupled` basis

- reduced Dicke space (effective density matrix), `jspin`

- symmetric subspace, `jmat`

Bests, 

Nathan 

On Tue, Jun 14, 2022 at 8:47 AM 'NI' via QuTiP: Quantum Toolbox in Python <qu...@googlegroups.com> wrote:

Hello,

I'm trying to simulate an open system with a time-dependent Hamiltonian with a particle number N > 200. My first thought was to use qutip.piqs Dicke.liouvillian(), but his \nLiouvillian space dim(N)=(N+2)^2/4 would be extremely large. At present, I only want to call \left | N/2,M \right \rangle, is there a related processing method in qutip? Or any other suggestion, how can I simulate such a multi-particle system.

Thanks!

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Dr. Nathan Shammah

www.nathanshammah.com