量子计算中的Python珍宝：探寻复杂问题的神奇解法

import qiskit
from qiskit import QuantumCircuit, ClassicalReGISter, QuantumRegister, Aer

# Define the number of qubits and classical bits
num_qubits = 3
num_classical_bits = num_qubits

# Create a quantum and classical register
qreg = QuantumRegister(num_qubits, "q")
creg = ClassicalRegister(num_classical_bits, "c")

# Create a quantum circuit
circuit = QuantumCircuit(qreg, creg)

# Apply Hadamard gates to all qubits
for i in range(num_qubits):
circuit.h(qreg[i])

# Apply controlled-Z gates to entangle the qubits
for i in range(num_qubits):
for j in range(i+1, num_qubits):
circuit.cz(qreg[i], qreg[j])

# Apply Hadamard gates to all qubits again
for i in range(num_qubits):
circuit.h(qreg[i])

# Measure the qubits
circuit.measure(qreg, creg)

# Create a quantum simulator
simulator = Aer.get_backend("qasm_simulator")

# Execute the circuit
result = simulator.run(circuit).result()

# Get the measurement results
counts = result.get_counts()

# Print the measurement results
print(counts)