diff --git a/src/Quantum/MP.jl b/src/Quantum/MP.jl
index 52ca5cb7a..18ba008a5 100644
--- a/src/Quantum/MP.jl
+++ b/src/Quantum/MP.jl
@@ -32,7 +32,6 @@ sitealias(::Type{MatrixProduct{P,Open}}, order, n, i) where {P<:Plug} =
         order
     end
 sitealias(::Type{MatrixProduct{P,Periodic}}, order, n, i) where {P<:Plug} = tuple(order...)
-sitealias(::Type{MatrixProduct{P,Infinite}}, order, n, i) where {P<:Plug} = tuple(order...)
 
 defaultorder(::Type{<:MatrixProduct{Property}}) = (:l, :r)
 defaultorder(::Type{<:MatrixProduct{State}}) = (:l, :r, :o)
diff --git a/src/Quantum/PEP.jl b/src/Quantum/PEP.jl
index df3fb5533..06e36d742 100644
--- a/src/Quantum/PEP.jl
+++ b/src/Quantum/PEP.jl
@@ -30,7 +30,6 @@ function sitealias(::Type{<:ProjectedEntangledPair{P,Open}}, order, size, pos) w
     end
 end
 sitealias(::Type{<:ProjectedEntangledPair{P,Periodic}}, order, _, _) where {P<:Plug} = tuple(order...)
-sitealias(::Type{<:ProjectedEntangledPair{P,Infinite}}, order, _, _) where {P<:Plug} = tuple(order...)
 
 defaultorder(::Type{<:ProjectedEntangledPair{State}}) = (:l, :r, :u, :d, :o)
 defaultorder(::Type{<:ProjectedEntangledPair{Operator}}) = (:l, :r, :u, :d, :i, :o)
diff --git a/src/Quantum/Quantum.jl b/src/Quantum/Quantum.jl
index e09528736..65b4bbe42 100644
--- a/src/Quantum/Quantum.jl
+++ b/src/Quantum/Quantum.jl
@@ -230,7 +230,6 @@ end
 abstract type Boundary end
 struct Open <: Boundary end
 struct Periodic <: Boundary end
-struct Infinite <: Boundary end
 
 """
     boundary(::QuantumTensorNetwork)
@@ -239,7 +238,6 @@ Return the `Boundary` type of the [`TensorNetwork`](@ref). The following `Bounda
 
   - `Open`
   - `Periodic`
-  - `Infinite`
 """
 function boundary end
 
diff --git a/src/Tenet.jl b/src/Tenet.jl
index 8e0b066ef..bbe52d09f 100644
--- a/src/Tenet.jl
+++ b/src/Tenet.jl
@@ -19,7 +19,7 @@ export transform, transform!
 include("Quantum/Quantum.jl")
 export QuantumTensorNetwork, sites, fidelity
 export Plug, plug, Property, State, Dual, Operator
-export Boundary, boundary, Open, Periodic, Infinite
+export Boundary, boundary, Open, Periodic
 
 include("Quantum/MP.jl")
 export MatrixProduct, MPS, MPO
diff --git a/test/MatrixProductOperator_test.jl b/test/MatrixProductOperator_test.jl
index d0f5dbc5d..97cc6de2d 100644
--- a/test/MatrixProductOperator_test.jl
+++ b/test/MatrixProductOperator_test.jl
@@ -93,42 +93,6 @@
                 MatrixProduct{Operator,Periodic}(arrays) isa QuantumTensorNetwork
             end
         end
-
-        # @testset "`Infinite` boundary" begin
-        #     # product operator
-        #     @test skip = true begin
-        #         arrays = [rand(1, 1, 2, 2), rand(1, 1, 2, 2), rand(1, 1, 2, 2)]
-        #         MatrixProduct{Operator,Infinite}(arrays) isa MPO{Infinite}
-        #     end
-
-        #     # alternative constructor
-        #     @test skip = true begin
-        #         arrays = [rand(1, 1, 2, 2), rand(1, 1, 2, 2), rand(1, 1, 2, 2)]
-        #         MatrixProduct{Operator}(arrays; boundary = Infinite) isa MPO{Infinite}
-        #     end
-
-        #     # entangling operator
-        #     @test skip = true begin
-        #         i = 3
-        #         o = 5
-        #         arrays = [rand(2, 4, i, o), rand(4, 8, i, o), rand(8, 2, i, o)]
-        #         MatrixProduct{Operator,Infinite}(arrays) isa MPO{Infinite}
-        #     end
-
-        #     # entangling operator - change order
-        #     @test skip = true begin
-        #         i = 3
-        #         o = 5
-        #         arrays = [rand(2, i, 4, o), rand(4, i, 8, o), rand(8, i, 2, o)]
-        #         MatrixProduct{Operator,Infinite}(arrays, order = (:l, :i, :r, :o)) isa MPO{Infinite}
-        #     end
-
-        #     # fail on Infinite with Open format
-        #     @test_throws MethodError begin
-        #         arrays = [rand(1, 2, 2), rand(1, 1, 2, 2), rand(1, 2, 2)]
-        #         MatrixProduct{Operator,Infinite}(arrays) isa MPO{Infinite}
-        #     end
-        # end
     end
 
     @testset "merge" begin
diff --git a/test/MatrixProductState_test.jl b/test/MatrixProductState_test.jl
index a2066c940..c3459a66e 100644
--- a/test/MatrixProductState_test.jl
+++ b/test/MatrixProductState_test.jl
@@ -99,48 +99,6 @@
                 MatrixProduct{State,Periodic}(arrays) isa QuantumTensorNetwork
             end
         end
-
-        # @testset "`Infinite` boundary" begin
-        #     # product state
-        #     @test skip = true begin
-        #         arrays = [rand(1, 1, 2), rand(1, 1, 2), rand(1, 1, 2)]
-        #         MatrixProduct{State,Infinite}(arrays) isa MPS{Infinite}
-        #     end
-
-        #     # entangled state
-        #     @test skip = true begin
-        #         arrays = [rand(3, 4, 2), rand(4, 8, 2), rand(8, 3, 2)]
-        #         MatrixProduct{State,Infinite}(arrays) isa MPS{Infinite}
-        #     end
-
-        #     @testset "custom order" begin
-        #         arrays = [rand(3, 1, 3), rand(3, 1, 3), rand(3, 1, 3)]
-        #         ψ = MatrixProduct{State,Infinite}(arrays, order = (:r, :o, :l))
-
-        #         @test skip = true ψ isa MPS{Infinite}
-        #     end
-
-        #     # alternative constructor
-        #     @test skip = true begin
-        #         arrays = [rand(1, 1, 2), rand(1, 1, 2), rand(1, 1, 2)]
-        #         MatrixProduct{State}(arrays; boundary = Infinite) isa MPS{Infinite}
-        #     end
-
-        #     # fail on Infinite with Open format
-        #     @test_throws skip = true Exception begin
-        #         arrays = [rand(1, 2), rand(1, 1, 2), rand(1, 2)]
-        #         MatrixProduct{State,Infinite}(arrays) isa MPS{Infinite}
-        #     end
-
-        #     # @testset "tensors" begin
-        #     #     arrays = [rand(1, 1, 2), rand(1, 1, 2), rand(1, 1, 2)]
-        #     #     ψ = MatrixProduct{State,Infinite}(arrays, order = (:l, :r, :o))
-
-        #     #     @test tensors(ψ, 1) isa Tensor
-        #     #     @test tensors(ψ, 4) == tensors(ψ, 1)
-        #     #     @test tensors(ψ, 0) == tensors(ψ, 3)
-        #     # end
-        # end
     end
 
     @testset "merge" begin