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change default site value for FiniteMPS in entanglement_spectrum #245

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merged 2 commits into from
Feb 5, 2025
Merged

change default site value for FiniteMPS in entanglement_spectrum #245

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235fbe3
change default site value for `FiniteMPS` in `entanglement_spectrum`
VictorVanthilt Feb 5, 2025
02f208c
change `entanglement_spectrum` docstring
VictorVanthilt Feb 5, 2025
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12 changes: 10 additions & 2 deletions src/algorithms/toolbox.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -86,13 +86,21 @@
end

"""
entanglement_spectrum(ψ, [site::Int=0]) -> SectorDict{sectortype(ψ),Vector{<:Real}}
entanglement_spectrum(ψ, site::Int) -> SectorDict{sectortype(ψ),Vector{<:Real}}

Compute the entanglement spectrum at a given site, i.e. the singular values of the gauge
matrix to the right of a given site. This is a dictionary mapping the charge to the singular
values.

For `InfiniteMPS` and `WindowMPS` the default value for `site` is 0.

For `FiniteMPS` no default value for `site` is given, it is up to the user to specify.
"""
function entanglement_spectrum(st::Union{InfiniteMPS,FiniteMPS,WindowMPS}, site::Int=0)
function entanglement_spectrum(st::Union{InfiniteMPS,WindowMPS}, site::Int=0)
checkbounds(st, site)
return LinearAlgebra.svdvals(st.C[site])
end
function entanglement_spectrum(st::FiniteMPS, site::Int)

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checkbounds(st, site)
return LinearAlgebra.svdvals(st.C[site])
end
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