Description

This quantum circuit creates two entangled pairs of qubits and performs a Bell state measurement on the second qubit of each pair.

Qiskit Circuit Code

```python
from qiskit import *

# Create circuit with 4 qubits and 2 classical bits
qc = QuantumCircuit(4, 2)

# Create first entangled pair between qubits 0 and 1
qc.h(0)
qc.cx(0, 1)

# Create second entangled pair between qubits 2 and 3
qc.h(2)
qc.cx(2, 3)

# Perform Bell state measurement on qubits 1 and 2
qc.cx(1, 2)
qc.h(1)
qc.measure([1, 2], [0, 1])  # Measure qubits 1 and 2

# At this point, qubits 0 and 3 are entangled
```

Quantum Execution Results

{
  "backend": "ibm_kyiv",
  "error": "\u0027Failed to run program: \\\u0027409 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\"}]}\\\u0027\u0027",
  "status": "failed"
}

Download Results