Photonic fusion of entangled resource states from a quantum emitter

Understand

Fusion-based photonic quantum computing architectures rely on two primitives: i) near-deterministic generation and control of constant-size entangled states and ii) probabilistic entangling measurements (photonic fusion gates) between entangled states.

• Here, we demonstrate these key functionalities by fusing resource states deterministically generated using a solid-state spin-photon interface.
• Repetitive operation of the source leads to sequential entanglement generation, whereby curiously entanglement is created between the quantum states of the same spin at two different instances in time.
• Such temporal multiplexing of photonic entanglement provides a resource-efficient route to scaling many-body entangled systems with photons.