This circuit attempts to clone an arbitrary quantum state using a controlled-not gate but fails due to the no-cloning theorem.
```python
from qiskit import QuantumCircuit
# Create a circuit with 3 qubits and 2 classical bits
qc = QuantumCircuit(3, 2)
# Prepare an unknown quantum state on qubit 0
theta = 1.23 # Arbitrary angle
qc.ry(theta, 0)
# Attempt to clone the state of qubit 0 onto qubit 1
qc.cx(0, 1)
# Measure both qubits
qc.measure([0, 1], [0, 1])
```'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"}]}\''