Qubit ZooThe KLM scheme: proves that efficient quantum computation is possible using only single-photon sources, linear optical elements (beam splitters, phase shifters), and photon detectors with feed-forward. Overturns the assumption that photon-photon nonlinearities are required for photonic quantum computing.
Key Results
- Nondeterministic CNOT gate using ancilla photons and post-selection
- Success probability boosted to near-unity via teleportation gadgets
- Requires only linear optics + single-photon detection + classical feed-forward
- Resource overhead: ~10⁴ photons per gate (original), dramatically reduced by later schemes
Links
- Journal: Nature