add Statistics.jl to dependency

Author: ytdHuang

Project.toml

@@ -23,6 +23,7 @@ SciMLOperators = "c0aeaf25-5076-4817-a8d5-81caf7dfa961"
 SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
 StaticArraysCore = "1e83bf80-4336-4d27-bf5d-d5a4f845583c"
+Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 StochasticDiffEq = "789caeaf-c7a9-5a7d-9973-96adeb23e2a0"
 
 [weakdeps]
@@ -63,6 +64,7 @@ SciMLOperators = "0.3, 0.4"
 SparseArrays = "1"
 SpecialFunctions = "2"
 StaticArraysCore = "1"
+Statistics = "1"
 StochasticDiffEq = "6"
 Test = "1"
 julia = "1.10"

src/QuantumToolbox.jl

@@ -5,6 +5,7 @@ using LinearAlgebra
 import LinearAlgebra: BlasInt, BlasFloat, checksquare
 import LinearAlgebra.LAPACK: hseqr!
 using SparseArrays
+import Statistics: mean, std
 
 # SciML packages (for QobjEvo, OrdinaryDiffEq, and LinearSolve)
 import SciMLBase: