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qalu.py

@@ -19,7 +19,7 @@ def nor_(circ,a,b,out):
     circ.cx(b,out)
     circ.ccx(a,b,out)
     circ.x(out)
- 
+
 def xnor_(circ,a,b,out):
     circ.cx(a,out)
     circ.cx(b,out)
@@ -34,6 +34,10 @@ def full_adder(circ,a,b,c_in,t_0,t_1,t_2,c_out,sum_):
     and_(circ,a,b,t_1)
     and_(circ,c_in,t_0,t_2)
     or_(circ,t_1,t_2,c_out)
+    circ.ccx(c_in,t_0,t_2)
+    circ.cx(a,t_0)
+    circ.cx(b,t_0)
+    circ.ccx(a,b,t_1)
 
 def half_subtractor(circ, a, b, carry, diff):
     xor_(circ,a,b,diff)
@@ -44,7 +48,12 @@ def full_subtractor(circ,a,b,c_in,t_0,t_1,t_2,c_out,diff):
     xor_(circ,t_0,c_in,diff)
     circ.x(a)
     circ.ccx(a,b,t_1)
-    circ.x(a)
     circ.x(t_0)
     circ.ccx(t_0,c_in,t_2)
     or_(circ,t_1,t_2,c_out)
+    circ.ccx(c_in,t_0,t_2)
+    circ.ccx(a,b,t_1)
+    circ.x(t_0)
+    circ.x(a)
+    circ.cx(a,t_0)
+    circ.cx(b,t_0)