Photonic source of heralded GHZ states

Understand

Generating large multiphoton entangled states is of main interest due to enabling universal photonic quantum computing and all-optical quantum repeater nodes.

• These applications exploit measurement-based quantum computation using cluster states.
• Remarkably, it was shown that photonic cluster states of arbitrary size can be generated by using feasible heralded linear optics fusion gates that act on heralded three-photon Greenberger-Horne-Zeilinger (GHZ) states as the initial resource state.
• Thus, the capability of generating heralded GHZ states is of great importance for scaling up photonic quantum computing.