Description

This quantum circuit implements the Bernstein-Vazirani algorithm to identify a hidden binary string, specifically '1011', in a single query.

Qiskit Circuit Code

```python
from qiskit import QuantumCircuit

# Bernstein-Vazirani Algorithm with secret string '1011'
qc = QuantumCircuit(5, 4)

# Initialize the ancilla qubit in state |1⟩
qc.h(4)
qc.z(4)

# Apply Hadamard gates to the first 4 qubits
qc.h(range(4))

# Oracle implementation for secret string '1011'
secret_string = '1011'
for i, bit in enumerate(secret_string):
    if bit == '1':
        qc.cx(i, 4)

# Apply Hadamard gates again to the first 4 qubits
qc.h(range(4))

# Measure the first 4 qubits
qc.measure(range(4), range(4))
```

Quantum Execution Results

{
  "0000": 3,
  "0001": 1,
  "0101": 18,
  "1000": 1,
  "1001": 46,
  "1100": 11,
  "1101": 944
}

{
  "array_shape": "(1024, 1)",
  "array_size": "1024",
  "backend": "ibm_kyiv",
  "counts": {
    "0000": 3,
    "0001": 1,
    "0101": 18,
    "1000": 1,
    "1001": 46,
    "1100": 11,
    "1101": 944
  },
  "execution_time": "unknown",
  "num_bits": 4,
  "num_shots": 1024
}

Download Results