diff --git a/src/Quantum.jl b/src/Quantum.jl
index ee8ccf5..d87b169 100644
--- a/src/Quantum.jl
+++ b/src/Quantum.jl
@@ -79,6 +79,8 @@ struct Quantum
     end
 end
 
+Quantum(qtn::Quantum) = qtn
+
 Tenet.TensorNetwork(q::Quantum) = q.tn
 
 Base.copy(q::Quantum) = Quantum(copy(TensorNetwork(q)), copy(q.sites))