fix low rank tutorial

Author: ytdHuang

QuantumToolbox.jl/time_evolution/lowrank.qmd

@@ -46,7 +46,7 @@ M = latt.N + 1
 Define `lr` states. Take as initial state all spins up. All other `N` states are taken as those with minimum Hamming distance to the initial state.
 
 ```{julia}
-ϕ = Vector{QuantumObject{Vector{ComplexF64},KetQuantumObject,M-1}}(undef, M)
+ϕ = Vector{QuantumObject{KetQuantumObject,Dimensions{M - 1,NTuple{M - 1,Space}},Vector{ComplexF64}}}(undef, M)
 ϕ[1] = kron(fill(basis(2, 1), N_modes)...)
 
 i = 1