Fig. 2: Experimental setup for scalable determination of multi-photon entanglement in quantum networks. | npj Quantum Information

Fig. 2: Experimental setup for scalable determination of multi-photon entanglement in quantum networks.

From: Scalable determination of multipartite entanglement in quantum networks

Fig. 2

A SPDC photon source consists of a BBO crystal and a compensator [a CBBO and a half wave plate (HWP)] pumped with a pulsed laser beam. To generate multi-photon entanglement, two SPDC photon sources were created, and photons in modes \(2^{\prime}\) and \(3^{\prime}\) interfere with a PBS under good spatial and temporal overlap. Photons were selected by the narrow-band filter (NBF) and long-pass filter (LPF), collected by fiber couplers and detected by silicon avalanche single-photon detectors (not shown).

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