Description

This circuit implements the Deutsch-Jozsa algorithm for a balanced function and measures the first three qubits of a four-qubit system.

Qiskit Circuit Code

```python
from qiskit import QuantumCircuit

# Create circuit with 4 qubits and 3 classical bits
qc = QuantumCircuit(4, 3)

# Initialize the last qubit to |1>
qc.x(3)

# Apply Hadamard gates to all qubits
qc.h([0, 1, 2, 3])

# Oracle for a balanced function (example for Deutsch-Jozsa algorithm)
qc.cx(0, 3)
qc.cx(1, 3)
qc.cx(2, 3)

# Apply Hadamard gates to the first three qubits
qc.h([0, 1, 2])

# Measure the first three qubits
qc.measure([0, 1, 2], [0, 1, 2])
```

Quantum Execution Results

{
  "000": 8,
  "001": 4,
  "010": 4,
  "011": 16,
  "101": 20,
  "110": 45,
  "111": 927
}

{
  "array_shape": "(1024, 1)",
  "array_size": "1024",
  "backend": "ibm_kyiv",
  "counts": {
    "000": 8,
    "001": 4,
    "010": 4,
    "011": 16,
    "101": 20,
    "110": 45,
    "111": 927
  },
  "execution_time": "unknown",
  "num_bits": 3,
  "num_shots": 1024
}

Download Results