We propose a non-deterministic CNOT gate based on a quantum cloner, a quantum switch based on all optical routing of single photon by single photon, a quantum-dot spin in a double-sided optical microcavity with two photonic qubits, delay lines and other linear optical photonic devices. Our CNOT provides a fidelity of 78% with directly useful outputs for a quantum computing circuit and requires no ancillary qubits or electron spin measurements.
@article{arxiv.1811.06044,
title = {Can A Universal Quantum Cloner Be Used to Design an Experimentally Feasible Near-Deterministic CNOT Gate ?},
author = {Amor Gueddana and Peyman Gholami and Vasudevan Lakshminarayanan},
journal= {arXiv preprint arXiv:1811.06044},
year = {2019}
}