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Replace one final instance of the power operator with a bitshift

This idiom is used in other places in the code, so we should
remain consistent.

Joseph Weston authored on 15/11/2019 18:03:41
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@@ -53,7 +53,7 @@ def test_n_qubits_invalid(gate):
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 @given(n_qubits, n_qubit_gates)
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 def test_controlled(n, gate):
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-    nq = 2 ** n
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+    nq = 1 << n
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     controlled_gate = qsim.gate.controlled(gate)
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     assert controlled_gate.shape[0] == 2 * nq
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     assert np.all(controlled_gate[:nq, :nq] == np.identity(nq))