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[ITensorMPS] Small simplification to OpSum examples #1456

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May 22, 2024
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[ITensorMPS] Small simplification to OpSum examples #1456

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4 changes: 2 additions & 2 deletions docs/src/examples/DMRG.md
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Expand Up @@ -308,10 +308,10 @@ let
#
os = OpSum()
for j=1:N-1
os += -4,"Sz",j,"Sz",j+1
os -= 4,"Sz",j,"Sz",j+1
end
for j=1:N
os += -2*h,"Sx",j;
os -= 2*h,"Sx",j;
end
H = MPO(os,sites)

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2 changes: 1 addition & 1 deletion src/lib/ITensorMPS/examples/autodiff/circuit_optimization/vqe.jl
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Expand Up @@ -11,7 +11,7 @@ gradtol = 1e-4 # Tolerance for stopping gradient descent
function ising_hamiltonian(nsites; h)
ℋ = OpSum()
for j in 1:(nsites - 1)
ℋ += -1, "Z", j, "Z", j + 1
ℋ -= 1, "Z", j, "Z", j + 1
end
for j in 1:nsites
ℋ += h, "X", j
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4 changes: 2 additions & 2 deletions src/lib/ITensorMPS/examples/autodiff/mps_autodiff.jl
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Expand Up @@ -5,10 +5,10 @@ using Zygote
function ising(n; J, h)
os = OpSum()
for j in 1:(n - 1)
os += -J, "Z", j, "Z", j + 1
os -= J, "Z", j, "Z", j + 1
end
for j in 1:n
os += -h, "X", j
os -= h, "X", j
end
return os
end
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16 changes: 8 additions & 8 deletions src/lib/ITensorMPS/examples/dmrg/1d_hubbard_extended.jl
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Expand Up @@ -17,17 +17,17 @@ let

os = OpSum()
for b in 1:(N - 1)
os += -t1, "Cdagup", b, "Cup", b + 1
os += -t1, "Cdagup", b + 1, "Cup", b
os += -t1, "Cdagdn", b, "Cdn", b + 1
os += -t1, "Cdagdn", b + 1, "Cdn", b
os -= t1, "Cdagup", b, "Cup", b + 1
os -= t1, "Cdagup", b + 1, "Cup", b
os -= t1, "Cdagdn", b, "Cdn", b + 1
os -= t1, "Cdagdn", b + 1, "Cdn", b
os += V1, "Ntot", b, "Ntot", b + 1
end
for b in 1:(N - 2)
os += -t2, "Cdagup", b, "Cup", b + 2
os += -t2, "Cdagup", b + 2, "Cup", b
os += -t2, "Cdagdn", b, "Cdn", b + 2
os += -t2, "Cdagdn", b + 2, "Cdn", b
os -= t2, "Cdagup", b, "Cup", b + 2
os -= t2, "Cdagup", b + 2, "Cup", b
os -= t2, "Cdagdn", b, "Cdn", b + 2
os -= t2, "Cdagdn", b + 2, "Cdn", b
end
for i in 1:N
os += U, "Nupdn", i
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2 changes: 1 addition & 1 deletion src/lib/ITensorMPS/examples/dmrg/1d_ising_with_observer.jl
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Expand Up @@ -11,7 +11,7 @@ function tfimMPO(sites, h::Float64)
N = length(sites)
os = OpSum()
for j in 1:(N - 1)
os += -1, "Z", j, "Z", j + 1
os -= 1, "Z", j, "Z", j + 1
end
for j in 1:N
os += h, "X", j
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8 changes: 4 additions & 4 deletions src/lib/ITensorMPS/examples/dmrg/2d_hubbard_conserve_particles.jl
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Expand Up @@ -14,10 +14,10 @@ function main(; Nx=6, Ny=3, U=4.0, t=1.0)

os = OpSum()
for b in lattice
os += -t, "Cdagup", b.s1, "Cup", b.s2
os += -t, "Cdagup", b.s2, "Cup", b.s1
os += -t, "Cdagdn", b.s1, "Cdn", b.s2
os += -t, "Cdagdn", b.s2, "Cdn", b.s1
os -= t, "Cdagup", b.s1, "Cup", b.s2
os -= t, "Cdagup", b.s2, "Cup", b.s1
os -= t, "Cdagdn", b.s1, "Cdn", b.s2
os -= t, "Cdagdn", b.s2, "Cdn", b.s1
end
for n in 1:N
os += U, "Nupdn", n
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18 changes: 9 additions & 9 deletions src/lib/ITensorMPS/test/base/test_autompo.jl
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Expand Up @@ -905,7 +905,7 @@ end
M1 = MPO(a1, s)

a2 = OpSum()
a2 += -1, "C", 3, "Cdag", 1
a2 -= 1, "C", 3, "Cdag", 1
M2 = MPO(a2, s)

a3 = OpSum()
Expand Down Expand Up @@ -938,7 +938,7 @@ end
M1 = MPO(a1, s)

a2 = OpSum()
a2 += -1, "Cdn", 3, "Cdagdn", 1
a2 -= 1, "Cdn", 3, "Cdagdn", 1
M2 = MPO(a2, s)

p0uu = MPS(s, [1, 2, 2, 1, 1])
Expand Down Expand Up @@ -1013,9 +1013,9 @@ end
if m == i && n == j && p == l && q == k
exact_val += V[i, j, l, k]
elseif m == i && n == j && p == k && q == l
exact_val += -V[i, j, k, l]
exact_val -= V[i, j, k, l]
elseif m == j && n == i && p == l && q == k
exact_val += -V[j, i, l, k]
exact_val -= V[j, i, l, k]
elseif m == j && n == i && p == k && q == l
exact_val += V[j, i, k, l]
end
Expand All @@ -1036,7 +1036,7 @@ end
os = OpSum()
for i in 1:(N - 1)
os += +1im, "S+", i, "S-", i + 1
os += -1im, "S-", i, "S+", i + 1
os -= 1im, "S-", i, "S+", i + 1
end
H = MPO(os, sites)
psiud = MPS(sites, [1, 2, 1, 2])
Expand Down Expand Up @@ -1100,8 +1100,8 @@ end
t = 1.0
os = OpSum()
for n in 1:(N - 1)
os .+= -t, "Cdag", n, "C", n + 1
os .+= -t, "Cdag", n + 1, "C", n
os .-= t, "Cdag", n, "C", n + 1
os .-= t, "Cdag", n + 1, "C", n
end
s = siteinds("Fermion", N; conserve_qns=true)
os_original = deepcopy(os)
Expand Down Expand Up @@ -1138,8 +1138,8 @@ end

os = OpSum()
for j in 1:(N - 1)
os += -t, "Adag", j, "A", j + 1
os += -t, "A", j, "Adag", j + 1
os -= t, "Adag", j, "A", j + 1
os -= t, "A", j, "Adag", j + 1
os += V1, "N", j, "N", j + 1
end
for j in 1:(N - 2)
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20 changes: 10 additions & 10 deletions src/lib/ITensorMPS/test/base/test_dmrg.jl
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Expand Up @@ -283,10 +283,10 @@ using ITensors.ITensorMPS: nsite, set_nsite!, site_range

os = OpSum()
for j in 1:(N - 1)
os += -1, "Sz", j, "Sz", j + 1
os -= 1, "Sz", j, "Sz", j + 1
end
for j in 1:N
os += -0.2, "Sx", j
os -= 0.2, "Sx", j
end
H = MPO(os, sites)

Expand Down Expand Up @@ -390,13 +390,13 @@ using ITensors.ITensorMPS: nsite, set_nsite!, site_range

os = OpSum()
for j in 1:(N - 1)
os += -t1, "Cdag", j, "C", j + 1
os += -t1, "Cdag", j + 1, "C", j
os -= t1, "Cdag", j, "C", j + 1
os -= t1, "Cdag", j + 1, "C", j
os += V, "N", j, "N", j + 1
end
for j in 1:(N - 2)
os += -t2, "Cdag", j, "C", j + 2
os += -t2, "Cdag", j + 2, "C", j
os -= t2, "Cdag", j, "C", j + 2
os -= t2, "Cdag", j + 2, "C", j
end
H = MPO(os, s)

Expand All @@ -421,10 +421,10 @@ using ITensors.ITensorMPS: nsite, set_nsite!, site_range
os += (U, "Nupdn", i)
end
for b in 1:(N - 1)
os += -t1, "Cdagup", b, "Cup", b + 1
os += -t1, "Cdagup", b + 1, "Cup", b
os += -t1, "Cdagdn", b, "Cdn", b + 1
os += -t1, "Cdagdn", b + 1, "Cdn", b
os -= t1, "Cdagup", b, "Cup", b + 1
os -= t1, "Cdagup", b + 1, "Cup", b
os -= t1, "Cdagdn", b, "Cdn", b + 1
os -= t1, "Cdagdn", b + 1, "Cdn", b
os += V1, "Ntot", b, "Ntot", b + 1
end
H = MPO(os, sites)
Expand Down
28 changes: 14 additions & 14 deletions src/lib/ITensorMPS/test/base/test_fermions.jl
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Expand Up @@ -50,8 +50,8 @@ import ITensors: Out, In
t1 = 1.0
os = OpSum()
for b in 1:(N - 1)
os += -t1, "Cdag", b, "C", b + 1
os += -t1, "Cdag", b + 1, "C", b
os -= t1, "Cdag", b, "C", b + 1
os -= t1, "Cdag", b + 1, "C", b
end
H = MPO(os, sites)

Expand All @@ -72,8 +72,8 @@ import ITensors: Out, In

os = OpSum()
for b in 1:(N - 1)
os += -t1, "Cdag", b, "C", b + 1
os += -t1, "Cdag", b + 1, "C", b
os -= t1, "Cdag", b, "C", b + 1
os -= t1, "Cdag", b + 1, "C", b
os += V1, "N", b, "N", b + 1
end
H = MPO(os, sites)
Expand Down Expand Up @@ -110,12 +110,12 @@ import ITensors: Out, In
s = siteinds("Fermion", N; conserve_qns=true)
os = OpSum()
for n in 1:(N - 1)
os += -t1, "Cdag", n, "C", n + 1
os += -t1, "Cdag", n + 1, "C", n
os -= t1, "Cdag", n, "C", n + 1
os -= t1, "Cdag", n + 1, "C", n
end
for n in 1:(N - 2)
os += -t2, "Cdag", n, "C", n + 2
os += -t2, "Cdag", n + 2, "C", n
os -= t2, "Cdag", n, "C", n + 2
os -= t2, "Cdag", n + 2, "C", n
end
H = MPO(os, s)

Expand Down Expand Up @@ -173,8 +173,8 @@ import ITensors: Out, In
ost = OpSum()
osV = OpSum()
for b in 1:(N - 1)
ost += -t1, "Cdag", b, "C", b + 1
ost += -t1, "Cdag", b + 1, "C", b
ost -= t1, "Cdag", b, "C", b + 1
ost -= t1, "Cdag", b + 1, "C", b
osV += V1, "N", b, "N", b + 1
end
Ht = MPO(ost, s)
Expand Down Expand Up @@ -213,12 +213,12 @@ import ITensors: Out, In

ost = OpSum()
for b in 1:(N - 1)
ost += -t1, "Cdag", b, "C", b + 1
ost += -t1, "Cdag", b + 1, "C", b
ost -= t1, "Cdag", b, "C", b + 1
ost -= t1, "Cdag", b + 1, "C", b
end
for b in 1:(N - 2)
ost += -t2, "Cdag", b, "C", b + 2
ost += -t2, "Cdag", b + 2, "C", b
ost -= t2, "Cdag", b, "C", b + 2
ost -= t2, "Cdag", b + 2, "C", b
end
Ht = MPO(ost, s)

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12 changes: 6 additions & 6 deletions src/lib/ITensorMPS/test/base/test_mps.jl
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Expand Up @@ -1811,8 +1811,8 @@ end
U = 1.0
opsum = OpSum()
for b in 1:(N - 1)
opsum .+= -t, "Cdag", b, "C", b + 1
opsum .+= -t, "Cdag", b + 1, "C", b
opsum .-= t, "Cdag", b, "C", b + 1
opsum .-= t, "Cdag", b + 1, "C", b
opsum .+= U, "N", b, "N", b + 1
end
H = MPO(opsum, s)
Expand Down Expand Up @@ -1897,10 +1897,10 @@ end
U = 1.0
opsum = OpSum()
for b in 1:(N - 1)
opsum .+= -t, "Cdagup", b, "Cup", b + 1
opsum .+= -t, "Cdagup", b + 1, "Cup", b
opsum .+= -t, "Cdagdn", b, "Cdn", b + 1
opsum .+= -t, "Cdagdn", b + 1, "Cdn", b
opsum .-= t, "Cdagup", b, "Cup", b + 1
opsum .-= t, "Cdagup", b + 1, "Cup", b
opsum .-= t, "Cdagdn", b, "Cdn", b + 1
opsum .-= t, "Cdagdn", b + 1, "Cdn", b
end
for n in 1:N
opsum .+= U, "Nupdn", n
Expand Down
10 changes: 5 additions & 5 deletions src/lib/ITensorMPS/test/base/test_qnmpo.jl
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Expand Up @@ -250,7 +250,7 @@ end
a = OpSum()
h = 0.5
for j in 1:(N - 1)
a .+= -1, "Sx", j, "Sx", j + 1
a .-= 1, "Sx", j, "Sx", j + 1
end
for j in 1:N
a .+= h, "Sz", j
Expand Down Expand Up @@ -323,10 +323,10 @@ function make_hubbard_opsum(
for dn in 1:NNN
tj, Vj = t / dn, V / dn
for n in 1:(N - dn)
os += -tj, "Cdagup", n, "Cup", n + dn
os += -tj, "Cdagup", n + dn, "Cup", n
os += -tj, "Cdagdn", n, "Cdn", n + dn
os += -tj, "Cdagdn", n + dn, "Cdn", n
os -= tj, "Cdagup", n, "Cup", n + dn
os -= tj, "Cdagup", n + dn, "Cup", n
os -= tj, "Cdagdn", n, "Cdn", n + dn
os -= tj, "Cdagdn", n + dn, "Cdn", n
os += Vj, "Ntot", n, "Ntot", n + dn
end
end
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8 changes: 4 additions & 4 deletions src/lib/ITensorMPS/test/base/test_threading.jl
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Expand Up @@ -33,10 +33,10 @@ end
lattice = square_lattice(Nx, Ny; yperiodic=true)
opsum = OpSum()
for b in lattice
opsum .+= -t, "Cdagup", b.s1, "Cup", b.s2
opsum .+= -t, "Cdagup", b.s2, "Cup", b.s1
opsum .+= -t, "Cdagdn", b.s1, "Cdn", b.s2
opsum .+= -t, "Cdagdn", b.s2, "Cdn", b.s1
opsum .-= t, "Cdagup", b.s1, "Cup", b.s2
opsum .-= t, "Cdagup", b.s2, "Cup", b.s1
opsum .-= t, "Cdagdn", b.s1, "Cdn", b.s2
opsum .-= t, "Cdagdn", b.s2, "Cdn", b.s1
end
for n in 1:N
opsum .+= U, "Nupdn", n
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6 changes: 3 additions & 3 deletions src/lib/ITensorMPS/test/ext/ITensorMPSChainRulesCoreExt/test_chainrules.jl
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Expand Up @@ -148,10 +148,10 @@ Random.seed!(1234)
function ising(n, h)
os = OpSum()
for j in 1:(n - 1)
os += -1, "Z", j, "Z", j + 1
os += -h, "X", j
os -= 1, "Z", j, "Z", j + 1
os -= h, "X", j
end
os += -h, "X", n
os -= h, "X", n
return os
end
H = MPO(ising(n, 1.0), s)
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2 changes: 1 addition & 1 deletion src/lib/ITensorMPS/test/ext/ITensorMPSChainRulesCoreExt/test_optimization.jl
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Expand Up @@ -198,7 +198,7 @@ include(joinpath(@__DIR__, "utils", "circuit.jl"))
function ising_hamiltonian(nsites; h)
ℋ = OpSum()
for j in 1:(nsites - 1)
ℋ += -1, "Z", j, "Z", j + 1
ℋ -= 1, "Z", j, "Z", j + 1
end
for j in 1:nsites
ℋ += h, "X", j
Expand Down
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