This circuit prepares superposition states, applies CZ gates according to a binary tree topology, and then measures all qubits.
```python
from qiskit import *
# Create circuit with 7 qubits and 7 classical bits
qc = QuantumCircuit(7, 7)
# Initialize all qubits to |+⟩ state
qc.h(range(7))
# Apply CZ gates according to binary tree topology
qc.cz(0, 1)
qc.cz(0, 2)
qc.cz(1, 3)
qc.cz(1, 4)
qc.cz(2, 5)
qc.cz(2, 6)
# Measure all qubits
qc.measure(range(7), range(7))
```'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"}]}\''