fix Qiskit#519 use scipy.stats.unitary_group

ikkoham · Aug 9, 2018 · 9f00614 · 9f00614
1 parent cf06614
commit 9f00614
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/qiskit/tools/qi/qi.py b/qiskit/tools/qi/qi.py
@@ -18,6 +18,7 @@
 
 import numpy as np
 import scipy.linalg as la
+from scipy.stats import unitary_group
 
 from qiskit import QISKitError
 from qiskit.tools.qi.pauli import pauli_group
@@ -335,8 +336,7 @@ def random_unitary_matrix(length):
     Returns:
         ndarray: U (length, length) unitary ndarray.
     """
-    q_matrix = la.qr(__ginibre_matrix(length))[0]  # Get only the first element
-    return q_matrix
+    return unitary_group.rvs(length)
 
 
 def random_density_matrix(length, rank=None, method='Hilbert-Schmidt'):