Default (zero) objective

src/objectives.jl

@@ -1,7 +1,7 @@
 module Objectives
 
 export Objective
-
+export DefaultObjective
 export QuantumObjective
 export QuantumStateObjective
 export QuantumUnitaryObjective
@@ -85,6 +85,36 @@ function sparse_to_moi(A::SparseMatrixCSC)
     vals = [A[i,j] for (i,j) ∈ inds]
     return (inds, vals)
 end
+
+"""
+    DefaultObjective
+
+    
+"""
+function DefaultObjective()
+    params = Dict()
+
+	@views function L(Z⃗::AbstractVector{<:Real}, Z::NamedTrajectory)
+        return 0.0
+    end
+
+    @views function ∇L(Z⃗::AbstractVector{<:Real}, Z::NamedTrajectory)
+        ∇ = zeros(Z.dim * Z.T)
+        return ∇
+    end
+
+    function ∂²L_structure(Z::NamedTrajectory)
+        structure = []
+        return structure
+    end
+
+    @views function ∂²L(Z⃗::AbstractVector{<:Real}, Z::NamedTrajectory; return_moi_vals=true)
+        return return_moi_vals ? [] : spzeros(Z.dim * Z.T, Z.dim * Z.T)
+    end
+
+	return Objective(L, ∇L, ∂²L, ∂²L_structure, Dict[params])
+end
+
 """
     QuantumObjective