#35 More trajectory demos

[Burkhard Schmidt]

We should add (quantum-)classical trajectory simulations to more of the (existing!) demo examples. The aim should be to learn more physics from the comparison with fully quantum-mechanical simulations. For example, the following demos could be extended:

• Double Well
• ConicalInter/SpinBoson

[Burkhard Schmidt]

It would be good to have (at least) one demo example involving more than two states