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arXiv:2402.08888

Quantum Light Generation based on GaN Microring towards Fully On-chip Source

Zeng, Hong, Zhao-Qin He, Yunru Fan, Yue Luo, Lyu, Chen, Jinpeng Wu, Yunbo Li, Sheng Hong Liu, Dong Wang, Dechao Zhang, Juan-Juan Zeng, Guangwei Deng, You Wang, Hai‐Zhi Song, Zhen Wang, Lixing You, Kai Guo, Changzheng Sun, Luo, Yi, Guang‐Can Guo, Qiang Zhou

Published Feb 14, 2024• 0 citations
arXivHTMLPDF

Abstract

Integrated quantum light source is increasingly desirable in large-scale quantum information processing.~Despite recent remarkable advances, new material platform is constantly being explored for the fully on-chip integration of quantum light generation, active and passive manipulation, and detection. Here, for the first time, we demonstrate a gallium nitride (GaN) microring based quantum light generation in the telecom C-band, which has potential towards the monolithic integration of quantum light source.~In our demonstration, the GaN microring has a free spectral range of 330 GHz and a near-zero anomalous dispersion region of over 100 nm. The generation of energy-time entangled photon pair is demonstrated with a typical raw two-photon interference visibility of 95.5$\pm$6.5%, which is further configured to generate heralded single photon with a typical heralded second-order auto-correlation $g^{(2)}_{H}(0)$ of 0.045$\pm$0.001. Our results pave the way for developing chip-scale quantum photonic circuit.

DOI
10.48550/arxiv.2402.08888

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Integrated quantum light source is increasingly desirable in large-scale quantum information processing.~Despite recent remarkable advances, new material platform is constantly being explored for the fully on-chip integration of quantum light generation, active and passive manipulation, and detection. Here, for the first time, we demonstrate a gallium nitride (GaN) microring based quantum light generation in the telecom C-band, which has potential towards the monolithic integration of quantum light source.~In our demonstration, the GaN microring has a free spectral range of 330 GHz and a near-zero anomalous dispersion region of over 100 nm. The generation of energy-time entangled photon pair is demonstrated with a typical raw two-photon interference visibility of 95.5±\pm±6.5%, which is further configured to generate heralded single photon with a typical heralded second-order auto-correlation gH(2)(0)g^{(2)}_{H}(0)gH(2)​(0) of 0.045±\pm±0.001. Our results pave the way for developing chip-scale quantum photonic circuit.
An integrated quantum light source is increasingly desirable in large-scale quantum information processing. Despite recent remarkable advances, a new material platform is constantly being explored for the fully on-chip integration of quantum light generation, active and passive manipulation, and detection. Here, for the first time, we demonstrate a gallium nitride (GaN) microring based quantum light generation in the telecom C-band, which has potential toward the monolithic integration of quantum light source. In our demonstration, the GaN microring has a free spectral range of 330 GHz and a near-zero anomalous dispersion region of over 100 nm. The generation of energy-time entangled photon pair is demonstrated with a typical raw two-photon interference visibility of 95.5±6.5%, which is further configured to generate a heralded single photon with a typical heralded second-order autocorrelation g_{H}^{(2)}(0) of 0.045±0.001. Our results pave the way for developing a chip-scale quantum photonic circuit.
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Abstract Entanglement plays a vital role in quantum information processing. Owing to its unique material properties, silicon carbide recently emerged as a promising candidate for the scalable implementation of advanced quantum information processing capabilities. To date, however, in silicon carbide only entanglement of nuclear spins has been reported, while an entangled photon source, whether it is based on bulk or chip-scale technologies, remains elusive. Here, we report the first demonstration of an entangled photon source in an integrated silicon carbide platform. Specifically, strongly correlated photon pairs are efficiently generated at the telecom C-band wavelength through implementing spontaneous four-wave mixing in a compact microring resonator in the 4H-silicon-carbide-on-insulator platform. Energy-time entanglement is created and verified for such signal-idler photon pairs, with the two-photon interference fringes exhibiting a visibility larger than 99%. The heralded single-photon properties are also measured, with the heralded g (2) (0) on the order of 10 − 3 , demonstrating the CMOS-compatible integrated platform as a prospective fully integrated CMOS-compatible single-photon source for quantum applications.
Thin-film lithium tantalate (TFLT) has emerged as a promising integrated photonic platform owing to its low photorefractive noise, high optical damage threshold, and reduced birefringence, attracting increasing interest for scalable photonic technologies. Here, to the best of our knowledge, we demonstrate the first quantum light source with TFLT via spontaneous four-wave mixing, bridging the gap between the rapidly advancing classical TFLT ecosystem and integrated quantum photonics. The fabricated microring exhibits a free spectral range of 350~GHz and an optical quality factor of 10610^6106, enabling efficient cavity-enhanced nonlinear interactions. Correlated photon pairs are generated across the telecom band from 1510 to 1570~nm, with a photon pair generation rate of 24 MHz/mW2\mathrm{MHz/mW^{2}}MHz/mW2 at a wavelength of 1535.04 nm. The source delivers strongly antibunched heralded single photons with gH(2)(0)=0.071±0.004g^{(2)}_{H}(0)=0.071\pm0.004gH(2)​(0)=0.071±0.004 at a heralding rate of 170 kHz, while the unheralded statistics yield g(2)(0)=1.93±0.05g^{(2)}(0)=1.93 \pm 0.05g(2)(0)=1.93±0.05, indicating near-single-temporal-mode emission. Energy-time entanglement is further confirmed by a raw two-photon interference visibility of 92.55±0.94%92.55\pm0.94\%92.55±0.94%, well above the Bell-inequality violation threshold. These results establish TFLT as a manufacturing-compatible platform for scalable photonic quantum circuits, paving the way for the monolithic co-integration of classical and quantum photonic functionalities.