diff --git a/src/express.jl b/src/express.jl
index c088c27..2da5077 100644
--- a/src/express.jl
+++ b/src/express.jl
@@ -23,9 +23,11 @@ express(s, repr::AbstractRepresentation) = express(s, repr, UseAsState())
 ##
 
 """Representation using kets, bras, density matrices, and superoperators governed by `QuantumOptics.jl`."""
-Base.@kwdef struct QuantumOpticsRepr <: AbstractRepresentation 
+Base.@kwdef struct QuantumOpticsRepr <: AbstractRepresentation
     cutoff::Int = 2
+    lazy::Bool = false
 end
+QuantumOpticsRepr(cutoff::Int) = QuantumOpticsRepr(cutoff=cutoff)
 """Similar to `QuantumOpticsRepr`, but using trajectories instead of superoperators."""
 struct QuantumMCRepr <: AbstractRepresentation end
 """Representation using tableaux governed by `QuantumClifford.jl`"""