Created
August 10, 2022 18:01
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Qutip 4 feedback solver
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| ## From https://github.com/qutip/qutip/issues/1571#issuecomment-859873615 | |
| times = [0, ...] | |
| # Liouvillians for parts you have control over | |
| control_liouvillians = [qutip.liouvillian(h) for h in control_hamiltonians] | |
| # The time-dependent Hamiltonian for stuff you're not controlling | |
| base_hamiltonian = qutip.QobjEvo([H0, [H1, time_dependence], ...]) | |
| # Turn it into a Liouvillian once, so we don't repeat the cost | |
| base = qutip.liouvillian(base_hamiltonian, collapse_operators) | |
| state = ... | |
| options = qutip.Options(store_states=False, store_final_state=True) | |
| for prev, time in zip(times[:-1], times[1:]): | |
| controls = krotov.get_next_controls(time, state, ...) | |
| current_liouvillian = base.copy() | |
| for control, operator in zip(controls, control_liouvillians): | |
| current_liouvillian += control * operator | |
| # ^^^^^^^^^^^^^^^^^^ | |
| # each of these terms is a single time-independent Qobj, | |
| # and the sum is a single QobjEvo with all the uncontrolled | |
| # time dependence already handled. | |
| state = qutip.mesolve(current_liouvillian, state, [prev, time], options=options).final_state |
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