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Fix bug in DMRG-X with QNs #61

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Jan 22, 2024
Merged

Fix bug in DMRG-X with QNs #61

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2 changes: 1 addition & 1 deletion src/dmrg_x.jl
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Expand Up @@ -2,7 +2,7 @@ function dmrg_x_solver(PH, t, psi0; kwargs...)
H = contract(PH, ITensor(true))
D, U = eigen(H; ishermitian=true)
u = uniqueind(U, H)
max_overlap, max_ind = findmax(abs, array(psi0 * U))
max_overlap, max_ind = findmax(abs, array(psi0 * dag(U)))
U_max = U * dag(onehot(u => max_ind))
return U_max, nothing
end
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1 change: 1 addition & 0 deletions test/Project.toml
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@@ -1,5 +1,6 @@
[deps]
DifferentialEquations = "0c46a032-eb83-5123-abaf-570d42b7fbaa"
ITensorTDVP = "25707e16-a4db-4a07-99d9-4d67b7af0342"
ITensors = "9136182c-28ba-11e9-034c-db9fb085ebd5"
KrylovKit = "0b1a1467-8014-51b9-945f-bf0ae24f4b77"
LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
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2 changes: 1 addition & 1 deletion test/test_dmrg.jl
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Expand Up @@ -29,7 +29,7 @@ using Test
H, psi; nsweeps, maxdim, cutoff, nsite, solver_krylovdim=3, solver_maxiter=1
)

e2, psi2 = dmrg(H, psi, sweeps; normalize=false, outputlevel=0)
e2, psi2 = dmrg(H, psi, sweeps; outputlevel=0)

@test inner(psi', H, psi) ≈ inner(psi2', H, psi2)
end
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4 changes: 2 additions & 2 deletions test/test_dmrg_x.jl
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Expand Up @@ -3,7 +3,7 @@ using ITensorTDVP
using Random
using Test

@testset "DMRG-X" begin
@testset "DMRG-X (conserve_qns=$conserve_qns)" for conserve_qns in [false, true]
function heisenberg(n; h=zeros(n))
os = OpSum()
for j in 1:(n - 1)
Expand All @@ -20,7 +20,7 @@ using Test
end

n = 10
s = siteinds("S=1/2", n)
s = siteinds("S=1/2", n; conserve_qns)

Random.seed!(12)

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