Multi-channel, tunable array of single-photon sources on a fiber chip

Single-photon sources provide an important building block for quantum technologies using photons, including photonic quantum simulators and quantum networks. To increase quantum channel capacity and advance quantum protocols, reliable multi-channel quantum light sources are essential. Recent advancements in solid-state quantum emitters have led to high-performance single-photon generation; however, integrating these quantum devices into practical optical platforms remains a significant challenge.

In this work, we present a breakthrough in developing a tunable array of fiber-integrated single-photon sources. A hole-based circular Bragg grating cavity produces vertical beaming that matches with a single-mode fiber. The pick-and-place technique enables the selective integration of multiple quantum dot devices onto a V-groove fiber platform. Additionally, metal patterning on the fiber cools the integrated devices to low temperatures, and it also plays as electrodes applying electric fields to the integrated quantum dot devices.

Our fiber-integrated quantum platform offers scalability, tunability, high yield, and high single-photon coupling efficiency, enabling the realization of a reliable and compact single-photon array on a fiber chip at telecom wavelengths.