This circuit initializes three qubits to the |+⟩ state, applies controlled-Z gates to form a triangle cluster state, and then measures all qubits.
```python
from qiskit import *
# Create circuit with 3 qubits and 3 classical bits
qc = QuantumCircuit(3, 3)
# Initialize all qubits to |+⟩ state
qc.h([0, 1, 2])
# Apply controlled-Z gates between all pairs to form a triangle cluster state
qc.cz(0, 1)
qc.cz(1, 2)
qc.cz(0, 2)
# Measure all qubits
qc.measure([0, 1, 2], [0, 1, 2])
```'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"}]}\''