Progressing along with quantum technologies, scientists are focusing on building quantum network in last decades. Using photons as the flying qubits to link the remote nodes is the key technology in quantum network. Both schemes based on quantum state transfer (between the photons and atoms) and remote entanglement generation (by aid of photons) are the solutions. Aiming on the quantum state transfer scheme, which requires strong coupling between single photon and single atom, lots of work have been done including integrating a fiber Fabry–Pérot cavity to improve the coupling factor. However there is still a long way to transfer the state of an atom to another atom. On the other hand, although quantum teleportation between ions had been realized basing on entanglement generation scheme, the quite low state preparing rate, which is confined by the photon collection efficiency, limits its application.

We plan to use a fiber Fabry–Pérot cavity to enhance the collection efficiency of photons, which is based on fluorescence Purcell enhancement with a moderate cooperativity. The cavity is design in the ultraviolet range, which is resonant with dipole transition of Yb ion. The loss of mirror coatings in ultraviolet range is much larger than the coatings in infrared range, the ultraviolet cavity cannot support quantum state transfer scheme well. However, the cavity still have a good cooperativity for florescence enhancement. As the enhanced florescence couple into the cavity mode, the cavity can collect most part fluorescence of the ion when the Purcell enhancement is larger than 1. Utilizing a large core fiber to match the cavity mode and fiber mode, the collected photons can be well coupled in to a single mode fiber.

We have made the ultraviolet fiber cavity, the result shows that the cavity supports Purcell enhancement well while keeping a high transmission. Simulations show a single-mode fiber collection efficiency over 50%. This technology can provide ultra-bright single photon sources based on trapped ions, supporting high entanglement generation rate in quantum network.