qubithubfidelity-kernel

Computes the quantum fidelity |⟨φ(x)|φ(y)⟩|² directly using the SWAP test circuit — an interferometric technique that measures state overlap via an ancilla qubit and controlled-SWAP gates. Requires 2n+1 qubits for n-qubit data encoding.

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Framework: PennyLane
Qubits: 5
Depth: 12
Gate set: H, RY, CSWAP
Licence: Not specified
Version: v1
Updated: 3 days ago
Last run: 3 months ago

5 of 7 runs

Status	Backend	Shots	Wall time
Completed	Simulator default.qubit	1024	27.1 s
Completed	Simulator default.qubit	1024	29.5 s
Completed	Simulator default.qubit	1024	27.6 s
Completed	Simulator qiskit_aer	1024	24.8 s
Completed	Simulator qiskit_aer	1024	18.8 s

All 7 runs

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Suggested citation

@software{qubithub_fidelitykernel_2026,
  author = {QubitHub Circuits},
  title = {Fidelity Kernel (SWAP Test)},
  year = {2026},
  version = {v1},
  url = {https://qubithub.co/qubithub/fidelity-kernel},
}

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Suggested citation