Description

This circuit performs a swap test to estimate the inner product of two quantum states.

Qiskit Circuit Code

```python
from qiskit import *

# Swap Test Circuit for Inner Product Estimation
qc = QuantumCircuit(3, 1)

# Prepare quantum states on qubits 1 and 2
qc.h(1)   # |ψ⟩ = |+⟩ state on qubit 1
# Qubit 2 remains in |0⟩ state (|ϕ⟩)

# Apply Hadamard gate to ancilla qubit 0
qc.h(0)

# Apply controlled-SWAP gate between qubits 1 and 2, controlled by qubit 0
qc.cswap(0, 1, 2)

# Apply Hadamard gate to qubit 0
qc.h(0)

# Measure qubit 0
qc.measure(0, 0)
```

Quantum Execution Results

{
  "0": 723,
  "1": 301
}

{
  "array_shape": "(1024, 1)",
  "array_size": "1024",
  "backend": "ibm_kyiv",
  "counts": {
    "0": 723,
    "1": 301
  },
  "execution_time": "unknown",
  "num_bits": 1,
  "num_shots": 1024
}

Download Results