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LLNL / Juqbox.jl

Juqbox.jl solves quantum optimal control problems in closed quantum systems
MIT License
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Pmin, calculate_timestep() and samplerate #9

Closed relugzosiraba closed 3 years ago

relugzosiraba commented 3 years ago

How should we choose Pmin?

Is samplerate for plots related to calculate_timestep()? They seem to be not directly related. What does samplerate represent for plots? Where do we takes "samples" from?

andersp commented 3 years ago

The samplerate parameter only controls the resolution in plots. The rate equals the number of samples per nano sec.

relugzosiraba commented 3 years ago

Thanks.

How should we choose Pmin? Could you point to the paper?

andersp commented 3 years ago

Pmin is used to specify the number of time steps per shortest period in the state vector. In many cases Pmin=40 keeps the time-stepping of Schroedinger's equation sufficiently accurate . Once you find a converged solution, you can test the time stepping accuracy by setting Pmin=80 and just evaluating the objective function with the same control functions. The gate infidelity and the evolution of populations should not change in any significant way. If they do, you need to increase Pmin.