Deterministic generation of indistinguishable photons in a cluster state

This paper demonstrates the deterministic generation of a multi-indistinguishable photon cluster state using periodic excitation of a semiconductor quantum-dot-confined spin. The generated photons are highly indistinguishable, enabling measurements and fusion of clusters by interfering photons. The continuously generated string of photons achieves deterministic gigahertz generation rates and an optimized entanglement length of about ten photons. This breakthrough opens new possibilities for scaling up cluster dimensionality and building graph states suitable for measurement-based photonic quantum computers and all-photonic quantum repeaters.

Dan Cogan, Zu-En Su, Oded Kenneth, David Gershoni