Extend the perturbative expansion past 3 levels.

[shobhan126]

Within perturbative_transmon.jl one can find the functions necessary to get a three level transmon.

QSimulator.jl/src/perturbative_transmon.jl

Line 211 in 1d2d744

function perturbative_transmon_freq(EC::Real, EJ1::Real, EJ2::Real, ϕ::Real;

QSimulator.jl/src/perturbative_transmon.jl

Line 242 in 1d2d744

function perturbative_transmon_anharm(EC::Real, EJ1::Real, EJ2::Real, ϕ::Real;

We would like to extend the functionality so we can also get perturbative expansions for higher levels.