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flexibilize types for partial_trace #109

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merged 2 commits into from
Dec 19, 2023
Merged

flexibilize types for partial_trace #109

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237043d
flexibilize types for partial_trace
araujoms Dec 9, 2023
ea673d4
a bit more elegant
araujoms Dec 9, 2023
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8 changes: 5 additions & 3 deletions src/math_util.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -212,7 +212,9 @@
0.2 0.6
```
"""
function partial_trace(ρ::Matrix, sys_dim::AbstractVector{Int}, dim_2_keep::AbstractVector{Int})
partial_trace(ρ::AbstractMatrix, sys_dim::AbstractVector{<:Integer}, dim_2_keep::Integer) = partial_trace(ρ,sys_dim,[dim_2_keep])

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function partial_trace(ρ::AbstractMatrix, sys_dim::AbstractVector{<:Integer}, dim_2_keep::AbstractVector{<:Integer})
size(ρ, 1) != size(ρ, 2) && throw(ArgumentError("ρ is not a square matrix."))
prod(sys_dim) != size(ρ, 1) && throw(ArgumentError("System dimensions do not multiply to density matrix dimension."))

Expand All @@ -226,7 +228,7 @@
re_dim[dim_2_trace] .= 1
tr_dim = copy(sys_dim)
tr_dim[dim_2_keep] .= 1
res = zeros(ComplexF64, re_dim..., re_dim...)
res = zeros(eltype(ρ), re_dim..., re_dim...)
for I in CartesianIndices(size(res))
for k in CartesianIndices((tr_dim...,))
delta = CartesianIndex(k, k)
Expand Down Expand Up @@ -358,4 +360,4 @@
L = diag(r)
L=L./abs.(L)
q*diagm(0=>L)
end
end
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