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Photonic interconnects between quantum systems will play a central role inboth scalable quantum computing and quantum networking. Entanglement of remotequbits via photons has been demonstrated in many platforms; however, improvingthe rate of entanglement generation will be instrumental for integratingphotonic links into modular quantum computers. We present an ion trap systemthat has the highest reported free-space photon collection efficiency forquantum networking. We use a pair of in-vacuum aspheric lenses, each with anumerical aperture of 0.8, to couple 10% of the 493 nm photons emitted from a$^{138}$Ba$^+$ ion into single-mode fibers. We also demonstrate that proximaleffects of the lenses on the ion position and motion can be mitigated.

Ion Trap with In-Vacuum High Numerical Aperture Imaging for a Dual-Species Modular Quantum Computer