Heralded three-photon entanglement from a single-photon source on a photonic chip

Understand

In the quest to build general-purpose photonic quantum computers, fusion-based quantum computation has risen to prominence as a promising strategy.

• This model allows a ballistic construction of large cluster states which are universal for quantum computation, in a scalable and loss-tolerant way without feed-forward, by fusing many small n-photon entangled resource states.
• However, a key obstacle to this architecture lies in efficiently generating the required essential resource states on photonic chips.
• One such critical seed state that has not yet been achieved is the heralded three-photon Greenberger-Horne-Zeilinger (3-GHZ) state.