Related papers: Integrated time-bin entangled quantum light source on a 4H-SiC microring chip

Integrated time-bin entangled quantum light source on a 4H-SiC microring chip

URL: http://arxiv.org/abs/2605.18124v1
Date: Mon, 18 May 2026 09:30:21 GMT
Title: Integrated time-bin entangled quantum light source on a 4H-SiC microring chip
Abstract summary: Integrated time-bin-entangled photon-pair source with cavity-enhanced nonlinear optical processes is essential for quantum information technologies.<n>We optimize the nonlinearity property of the material and the geometry of the integrated microring resonator with a 4H-silicon carbide platform.<n>Device achieves a time-bin-entangled photon-pair generation rate of 1.35 $times$ 107 s-1 mW-2.
Score: 18.136236279639004
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Integrated time-bin-entangled photon-pair source with cavity-enhanced nonlinear optical processes is essential for quantum information technologies. However, microcavities with a high quality factor inherently introduce a trade-off between generation efficiency and photon bandwidth, which hinders the development of high-speed quantum networks with an integrated source. Here, we address this challenge by optimizing the nonlinearity property of the material and the geometry of the integrated microring resonator with a 4H-silicon carbide platform. Operating at a loaded quality factor of 1.9 $\times$ 10^5 - spectral bandwidth of 1.0 GHz and pumped with 300-ps double pulses separated by 1.25 ns at a repetition rate of 160 MHz, the device achieves a time-bin-entangled photon-pair generation rate of 1.35 $\times$ 10^7 s^-1 mW^-2. A raw visibility of 95.55 $\pm$ 0.18% is measured, showing a violation of Bell's inequality by more than 138 standard deviations, and a fidelity of 94.37 $\pm$ 0.22% is obtained by quantum state tomography. These results provide a scalable pathway to an efficient and broadband time-bin entangled quantum light source, overcoming intrinsic limitations of cavity-based designs and advancing integrated platforms for future quantum communication networks.

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