Qiskit is an open-source framework for programming quantum computers. It provides tools for creating quantum circuits, simulating their behavior, and executing them on real or simulated quantum devices. Qiskit is written in Python and can be installed using pip.

The basic unit of a quantum circuit in Qiskit is the quantum register, which consists of a fixed number of qubits. To create a quantum circuit, we first create a quantum register and then add gates to it. Gates in Qiskit are represented as classes, and we can import them from the qiskit.circuit library. For example, the Hadamard gate can be imported as follows:

from qiskit.circuit.library import H

Once we have created a circuit, we can simulate its behavior using the built-in simulator in Qiskit. For example, to simulate a circuit with 2 qubits and a Hadamard gate on the first qubit, we can write:

from qiskit import QuantumCircuit, execute, Aer

# Create a quantum circuit with 2 qubits
circ = QuantumCircuit(2)

# Add a Hadamard gate to the first qubit
circ.h(0)

# Simulate the circuit using the built-in simulator
simulator = Aer.get_backend('qasm_simulator')
result = execute(circ, simulator).result()

# Print the resulting counts
print(result.get_counts(circ))

This will output a dictionary of counts, indicating the number of times each possible outcome was observed.

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