Propagators

calculate_bare_propagators(; Hamiltonian::AbstractMatrix{<:Complex}, dt::AbstractFloat, ntimes=1, external_fields::Union{Nothing,Vector{Utilities.ExternalField}}=nothing, forward_backward=true, L::Union{Nothing, Vector{Matrix{ComplexF64}}}=nothing)

This function calculates the bare propagators for a given system.

Arguments:

• Hamiltonian: the system is fundamentally described by the Hamiltonian
• external_fields [Default: nothing]: an optional listing of external fields that are acting on the system
• forward_backward [Default: true]: do you want a forward-backward propagator or just the forward propagator?
• L [Default: nothing]: an optional listing of Lindblad jump operators acting on the system (Acts only when forward_backward = true)
• dt: time-step corresponding to the bare propagator calculation
• ntimes [Default: 1]: number of time-steps for which the bare propagator should be calculated

Returns the ntimes propagators.

ReferenceChoice{choice}

This empty struct holds the particular choice of algorithm for selecting reference forces. choice currently can be one of fixed or ehrenfest.