Update tutorial_lcu_blockencoding.py (#1122)

In the block encoding example from [this demo](https://pennylane.ai/qml/demos/tutorial_lcu_blockencoding/), the resulting matrix does not appear correctly. This PR solves the problem.
PennyLaneAI · May 31, 2024 · a9151f6 · a9151f6
1 parent 94563bf
commit a9151f6
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/demonstrations/tutorial_lcu_blockencoding.metadata.json b/demonstrations/tutorial_lcu_blockencoding.metadata.json
@@ -12,7 +12,7 @@
  }
  ],
  "dateOfPublication": "2023-10-25T00:00:00+00:00",
- "dateOfLastModification": "2024-05-13T00:00:00+00:00",
+ "dateOfLastModification": "2024-05-31T00:00:00+00:00",
  "categories": [
  "Algorithms",
  "Quantum Computing"

diff --git a/demonstrations/tutorial_lcu_blockencoding.py b/demonstrations/tutorial_lcu_blockencoding.py
@@ -259,7 +259,7 @@ def lcu_circuit(): # block_encode
  return qml.state()
 
 
-output_matrix = qml.matrix(lcu_circuit, wire_order=[0, "ancilla"])()
+output_matrix = qml.matrix(lcu_circuit, wire_order=["ancilla", 0])()
 print("Block-encoded projector:\n")
 print(np.real(np.round(output_matrix,2)))