From three-photon GHZ states to ballistic universal quantum computation

Understand

Single photons, manipulated using integrated linear optics, constitute a promising platform for universal quantum computation.

• A series of increasingly efficient proposals have shown linear-optical quantum computing to be formally scalable.
• However, existing schemes typically require extensive adaptive switching, which is experimentally challenging and noisy, thousands of photon sources per renormalized qubit, and/or large quantum memories for repeat-until-success strategies.
• Our work overcomes all these problems.