Experimental ten-photon entanglement

Understand

Quantum entanglement among multiple spatially separated particles is of fundamental interest, and can serve as central resources for studies in quantum nonlocality, quantum-to-classical transition, quantum error correction, and quantum simulation.

• The ability of generating an increasing number of entangled particles is an important benchmark for quantum information processing.
• The largest entangled states were previously created with fourteen trapped ions, eight photons, and five superconducting qubits.
• Here, based on spontaneous parametric down-converted two-photon entanglement source with simultaneously a high brightness of ~12 MHz/W, a collection efficiency of ~70% and an indistinguishability of ~91% between independent photons, we demonstrate, for the first time, genuine and distillable entanglement of ten single photons under different pump power.