This circuit creates a unique entangled state of four qubits, applies a rotation to one of them, and then measures the resulting state.
```python
from qiskit import QuantumCircuit
# Create a circuit with 4 qubits and 4 classical bits
qc = QuantumCircuit(4, 4)
# Initialize qubits in a superposition state
qc.h(0)
qc.h(1)
qc.h(2)
qc.h(3)
# Apply a series of controlled-phase gates to create a unique entangled state
qc.cp(np.pi/2, 0, 1)
qc.cp(np.pi/2, 1, 2)
qc.cp(np.pi/2, 2, 3)
# Apply a rotation to one of the qubits to break symmetry
qc.ry(np.pi/4, 2)
# Entangle qubits further with controlled-NOT gates
qc.cx(3, 0)
qc.cx(2, 1)
# Measure all qubits
qc.measure([0, 1, 2, 3], [0, 1, 2, 3])
```'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"}]}\''