Add basic stabilizer generation.

Probably time to run some tests against anders and Briegel

abp/graphstate.py

@@ -108,6 +108,10 @@ class GraphState(object):
         #TODO
         pass
 
+    def order(self):
+        """ Get the number of qubits """
+        return len(self.vops)
+
     def __str__(self):
         """ Represent as a string for quick debugging """
         return "graph:\n vops: {}\n ngbh: {}\n"\
@@ -139,4 +143,20 @@ class GraphState(object):
         for key, (x, y, z) in pos.items():
             self.meta[key]["pos"] = {"x": round(x-ax, 0), "y": round(y-ay, 0), "z": round(z-az, 0)}
 
+    def to_stabilizer(self):
+        """ Get the stabilizer of this graph """
+        # TODO: VOPs are not implemented yet
+        output = ""
+        for a in self.ngbh:
+            for b in self.ngbh:
+                if a == b:
+                    output += " X "
+                elif a in self.ngbh[b]:
+                    output += " Z "
+                else:
+                    output += " I "
+            output += "\n"
+        return output
+            
+
         

tests/test_graph.py

@@ -80,4 +80,8 @@ def test_cz():
     g.act_cz(0, 1)
     assert g.has_edge(0, 1)
 
+def test_stabilizer():
+    """ Test that we can generate stabilizers okay """
+    g = demograph()
+    print g.to_stabilizer()
 

tests/test_json.py

@@ -19,7 +19,7 @@ def test_json_basic():
     """ Test that we can export to JSON """
     g = demograph()
     js = g.to_json()
-    assert "ngbh" in js
+    assert "edge" in js
     assert "vops" in js
     json.loads(js)