A quantum circuit that applies Hadamard and Controlled-Z gates to seven qubits based on a Sierpinski triangle pattern, then measures all qubits.
```python
from qiskit import QuantumCircuit
# Create a circuit with 7 qubits and 7 classical bits
qc = QuantumCircuit(7, 7)
# Apply Hadamard gates to all qubits to create superposition
qc.h(range(7))
# Apply Controlled-Z gates according to a Sierpinski triangle pattern
# Level 1 connections
qc.cz(0, 1)
qc.cz(1, 2)
qc.cz(0, 2)
# Level 2 connections
qc.cz(3, 4)
qc.cz(4, 5)
qc.cz(3, 5)
# Cross-level connections
qc.cz(0, 3)
qc.cz(1, 4)
qc.cz(2, 5)
# Central connection for fractal pattern
qc.cz(6, 3)
qc.cz(6, 4)
qc.cz(6, 5)
# 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"}]}\''