concentrate -> subroutine

quick-start/2.qft-phase-estimation/main.jl

@@ -134,14 +134,14 @@ ControlU(n, m, U) = chain(n+m, control(k, n+1:n+m=>matblock(U^(2^(k-1)))) for k
 # each of them is a `U` of power ``2^(k-1)``.
 
 # Since we will only apply the qft and Hadamard on first `n` qubits,
-# we could use `Concentrator`, which creates a context of
+# we could use `Subroutine`, which creates a context of
 # a sub-scope of the qubits.
 
 PE(n, m, U) =
     chain(n+m, # total number of the qubits
-        concentrate(Hadamards(n), 1:n), # apply H in local scope
+        subroutine(Hadamards(n), 1:n), # apply H in local scope
         ControlU(n, m, U),
-        concentrate(QFT(n)', 1:n))
+        subroutine(QFT(n)', 1:n))
 
 # we use the first `n` qubits as the output space to store phase ``ϕ``, and the
 # other `m` qubits as the input state which corresponds to an eigenvector of

quick-start/4.shor-algorithm/main.jl

@@ -108,7 +108,7 @@ feeding input `|1>⊗|0>` will get the resulting quantum register with the desir
 function order_finding_circuit(x::Int, L::Int; nbit::Int, ncbit::Int)
     N = nbit+ncbit
     chain(N, repeat(N, H, 1:ncbit), KMod{N, ncbit}(x, L),
-        concentrate(N, QFTCircuit(ncbit)', 1:ncbit))
+        subroutine(N, QFTCircuit(ncbit)', 1:ncbit))
 end
 
 # The circuit for order finding is consisted of three parts