Skip to content

Add regression test for long-range SvdCut with identity components #551

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
lkdvos merged 1 commit into from
Nov 2, 2026
Merged

Add regression test for long-range SvdCut with identity components #551

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
10 changes: 10 additions & 0 deletions test/algorithms/changebonds.jl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -247,6 +247,16 @@ end

ψ = FiniteMPS(rand, ComplexF64, L, pspace, ℙ^4)
@test expectation_value(ψ, H′) ≈ expectation_value(ψ, H) rtol = 1.0e-10

# operators with a non-zero trace lost precision geometrically with distance in v0.14.0 (#550)
pspace = ℂ^4
L = 30
n = TensorMap(ComplexF64[1 0 0 0; 0 0 0 0; 0 0 1 0; 0 0 0 0], pspace ← pspace)
H = FiniteMPOHamiltonian(fill(pspace, L), (5, 25) => n ⊗ n)

H′ = changebonds(H, SvdCut(; trunc = trunctol(; rtol = 0.0)))
ψ = FiniteMPS(rand, ComplexF64, L, pspace, ℂ^8)
@test expectation_value(ψ, H′) ≈ expectation_value(ψ, H) rtol = 1.0e-10
end

@testset "SvdCut on InfiniteMPOHamiltonian $(spacetype(pspace))" for (pspace, Dspace) in spacelist
Expand Down
Loading