This circuit initializes five qubits to the |+⟩ state, applies controlled-Z gates to form a cluster state in the shape of a pentagon and measures all qubits.
```python
from qiskit import QuantumCircuit
qc = QuantumCircuit(5, 5)
# Initialize all qubits to the |+⟩ state
qc.h(range(5))
# Apply controlled-Z gates to form a pentagon cluster state
qc.cz(0, 1)
qc.cz(1, 2)
qc.cz(2, 3)
qc.cz(3, 4)
qc.cz(4, 0)
# Measure all qubits
qc.measure(range(5), range(5))
```'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"}]}\''