fixed circuit_from_scratch

UTokyo-ICEPP · Mar 30, 2023 · ec9b3fa · ec9b3fa
1 parent 84e0c59
commit ec9b3fa
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Showing 2 changed files with 9 additions and 6 deletions.
diff --git a/source/ja/circuit_from_scratch.md b/source/ja/circuit_from_scratch.md
@@ -82,6 +82,8 @@ circuit.draw('mpl')
 
 ```{code-cell} ipython3
 def get_statevector_array(circuit):
+    # 渡された回路のコピーを使う
+    circuit = circuit.copy()
     # 量子回路の終状態の状態ベクトルを保存するインストラクション
     circuit.save_statevector()
     # 再び「おまじない」のtranspileをしてから、run()に渡す
@@ -857,11 +859,11 @@ print(np.square(np.abs(np.sum(sv_psi.conjugate() * sv_phi))))
 それに対し上の回路を1000000回実行した時の$P_0 - P_1$は
 
 ```{code-cell} ipython3
-qasm_simulator = Aer.get_backend('qasm_simulator')
+simulator = AerSimulator()
 shots = 1000000
 
-circuit = transpile(circuit, backend=qasm_simulator)
-counts = qasm_simulator.run(circuit, shots=shots).result().get_counts()
+circuit = transpile(circuit, backend=simulator)
+counts = simulator.run(circuit, shots=shots).result().get_counts()
 
 print((counts['0'] - counts['1']) / shots)
 ```
@@ -969,8 +971,8 @@ $$
 ```{code-cell} ipython3
 shots = 1000000
 
-circuit = transpile(circuit, backend=qasm_simulator)
-counts = qasm_simulator.run(circuit, shots=shots).result().get_counts()
+circuit = transpile(circuit, backend=simulator)
+counts = simulator.run(circuit, shots=shots).result().get_counts()
 
 print(counts['000'] / shots)
 ```

diff --git a/source/qc_workbook/show_state.py b/source/qc_workbook/show_state.py
@@ -86,14 +86,15 @@ def statevector_expr(
     ## If a QuantumCircuit is passed, extract the statevector
 
     if isinstance(statevector, QuantumCircuit):
+        circuit = statevector.copy()
         # Run the circuit in statevector_simulator and obtain the final state statevector
         simulator = AerSimulator(method='statevector')
 
         # Append an instruction to save the statevector of the final state of the circuit
         circuit.save_statevector()
 
         # Transpile and run the circuit
-        circuit = transpile(statevector, backend=simulator)
+        circuit = transpile(circuit, backend=simulator)
         statevector = np.asarray(simulator.run(circuit).result().data()['statevector'])
 
     ## Setup