How to Create a Bell State with Qiskit
Solution to Question 3 of the ongoing Quantum programming challenge
Hey everyone!
I recently published a challenge with 6 Qiskit questions to get started with Quantum Computing.
Here is the solution to the third question from the challenge.
Question 3
Create a 2-qubit circuit that prepares the following Bell state. Measure both qubits using a Qiskit simulator and show the results.
Solution 3
We start by installing Qiskit and the Qiskit Aer library.
Qiskit Aer is a high-performance library with realistic noise models to run quantum computing simulations on classical computers.
!uv pip install qiskit qiskit-aer Next, we import the necessary packages.
from qiskit import QuantumCircuit # To create and manipulate quantum circuits
from qiskit_aer import Aer # Qiskit simulator backend
from qiskit.visualization import plot_histogram # To visualise measurement results We then create the quantum circuit using QuantumCircuit(2, 2) where:
The first argument (2) represents two qubits, both starting in the state |0>, so the full initial state is |00>.
The second argument represents (2) two classical bits used to store the measurement results of the two qubits.
# Create circuit
circuit = QuantumCircuit(2, 2)