This circuit initializes a star graph state by applying Hadamard and controlled-Z gates, and then measures all qubits.
```python
from qiskit import *
# Create a quantum circuit with 5 qubits and 5 classical bits
qc = QuantumCircuit(5, 5)
# Initialize all qubits in the |+⟩ state
qc.h([0, 1, 2, 3, 4])
# Apply CZ gates between the central qubit (qubit 0) and all other qubits to create a star graph state
qc.cz(0, 1)
qc.cz(0, 2)
qc.cz(0, 3)
qc.cz(0, 4)
# Measure all qubits
qc.measure([0, 1, 2, 3, 4], [0, 1, 2, 3, 4])
```'Failed to run program: \'409 Client Error: Conflict for url: https://api.quantum.ibm.com/runtime/jobs. {"errors":[{"message":"You have reached the limit of 3 pending jobs. Please wait for a job to complete or cancel one before submitting anything new.","code":3458,"solution":"Wait until some previous jobs were finished. You can cancel pending jobs to run new jobs.","more_info":"https://docs.quantum-computing.ibm.com/errors"}]}\''