量子コンピュータを始めたい1

今回の参照先

やったこと

とりあえずコピペ

hello-qc.py

from qiskit import QuantumCircuit
from qiskit.quantum_info import SparsePauliOp
from qiskit.transpiler import generate_preset_pass_manager
from qiskit_ibm_runtime import EstimatorV2 as Estimator
 
# Create a new circuit with two qubits
qc = QuantumCircuit(2)
 
# Add a Hadamard gate to qubit 0
qc.h(0)
 
# Perform a controlled-X gate on qubit 1, controlled by qubit 0
qc.cx(0, 1)
 
# Return a drawing of the circuit using MatPlotLib ("mpl"). This is the
# last line of the cell, so the drawing appears in the cell output.
# Remove the "mpl" argument to get a text drawing.
qc.draw("mpl")

諸々抜けてると思うので簡単に環境作り

py -m venv venv

./vemv/Scripts/activate

pip install qiskit

とりあえず実行！

python ./hello-qc.py

モジュールがいろいろ足りていないらしい

ImportError: DLL load failed while importing symengine_wrapper: 指定されたモジュールが見つかりません。

qiskit.exceptions.MissingOptionalLibraryError: "The 'matplotlib' library is required to use 'MatplotlibDrawer'. You can install it with 'pip install matplotlib'."

qiskit.exceptions.MissingOptionalLibraryError: "The 'pylatexenc' library is required to use 'MatplotlibDrawer'. You can install it with 'pip install pylatexenc'."

上記の解消含めてやったこと

• C++ ランタイムインストール（https://www.microsoft.com/ja-jp/download/details.aspx?id=48145）
• symengineのバージョンダウン

pip uninstall symengine
pip install symengine==0.13.0

• matplotlibのpip install

pip install matplotlib

• pylatexencのpip install

pip install pylatexenc

再度実行してみた

python ./hello-qc.py

→何も出力されない...

サンプルコードには何かを出力するような処理はないらしい

以下の2行をコード中に追加

import matplotlib.pyplot as plt
plt.show()

最終姿

from qiskit import QuantumCircuit
from qiskit.quantum_info import SparsePauliOp
from qiskit.transpiler import generate_preset_pass_manager
from qiskit_ibm_runtime import EstimatorV2 as Estimator

import matplotlib.pyplot as plt
 
# Create a new circuit with two qubits
qc = QuantumCircuit(2)
 
# Add a Hadamard gate to qubit 0
qc.h(0)
 
# Perform a controlled-X gate on qubit 1, controlled by qubit 0
qc.cx(0, 1)
 
# Return a drawing of the circuit using MatPlotLib ("mpl"). This is the
# last line of the cell, so the drawing appears in the cell output.
# Remove the "mpl" argument to get a text drawing.
qc.draw("mpl")
plt.show()

今度こそ！

python ./hello-qc.py

でた！