Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Optical and Quantum Sensing and Precision Metrology II

Pushing the limits on chip-scale quantum light generation for sensing and precision metrology

Trevor J. Steiner, Joshua E. Castro, Lin Chang, John Edward Bowers, Galan Moody

Published Mar 3, 2022• 1 citation
Publisher

Abstract

The AlGaAsOI material platform offers great promise as a source of quantum states of light that can be utilized for enhanced sensing and metrology beyond the standard quantum limit. Here we focus on preliminary results from AlGaAsOI microring resonator sources that demonstrate a 1000-fold improvement in the brightness of entangled photon pairs compared to state-of-the-art chip-scale sources. The source maintains high single photon purity < 99% and time-energy entanglement visibility < 95%.

DOI
10.1117/12.2616972

Related papers

Ultrabright Entangled-Photon-Pair Generation from an AlGaAs -On-Insulator Microring Resonator

Trevor J. Steiner, Joshua E. Castro, Lin Chang +5 more

An on-chip entangled-photon pair source from an AlGaAs-on-insulator microring resonator is demonstrated, offering a nearly 1000-fold improvement over state-of-the-art brightness while maintaining >97% fidelity and >99% purity.

arXiv:2009.13462•PRX Quantum•Mar 4, 2021•156 citations

Time-energy Entangled Photon Pairs Generated via SFWM in an AlGaAsOI Ring Resonator

Joshua E. Castro, Trevor J. Steiner, Lin Chang +6 more

We report a time-energy entangled photon pair source from an AlGaAs microring resonator with an internal generation rate greater than 20× 109 pairs sec–1 mW-2 while maintaining high heralded single photon purity > 99% and visibility > 97%.

Optical Fiber Communication Conference•Jan 1, 2021•0 citations

Photon-pair sources for chip-scale quantum technology

Imad I. Faruque, Ben M. Burridge, Siddarth Koduru Joshi +2 more

Quantum technology promises to deliver quantum computers, unbreakable communication and ultra-sensitive sensors. Quantum photonics is one of the prominent platforms of quantum technology which utilizes photons – often called flying qubits. Entanglement generated from a photon-pair source is a crucial resource for many quantum photonic implementations, for example, an entanglement-based global quantum network and metrology beyond classical limits. Here, we will discuss our recent results of chip-scale photon-pair sources in silicon photonics. These results are focused on improving brightness, spectral purity and indistinguishability of the photon-pair sources, for example, by engineering photonic structures and temporal pulse shaping. We have found that both methods have trade-offs among brightness, spectral purity and indistinguishability. Additionally, we have observed that generating a high-fidelity quantum state using a quantum photonic circuit requires sufficient isolation between the nonlinear photon-pair sources and the linear photonic circuit. It is crucial to remove the nonlinear effect of the strong pump both before and after the sources to limit the spurious photon-pair generation which contaminates the target quantum state.

Quantum Sensing and Nano Electronics and Photonics•Mar 15, 2023•0 citations

Narrowband and High-Rate Entangled Photon-Pair Generation from a High-Q Silicon Microring Resonator

Shoichiro Yasui, Tomohiro Inaba, Hidetaka Nishi +4 more

Entangled photon-pair sources are essential components for emerging quantum information-processing technologies. Among various platforms, on-chip microresonators offer strong potential due to their resonant enhancement and suitability for wafer-scale integration. In this study, we demonstrate ultrabright entangled photon-pair generation from high- Q silicon microring resonators. By optimizing the device geometry and coupling configuration to suppress sidewall scattering and selectively excite the fundamental mode, we achieve single-mode resonance with an intrinsic Q -factor of 1.26 × 10 6 using only standard fabrication processes available in CMOS foundries. The resulting high- Q resonator yields a record-high brightness coefficient of 3.9 × 10 9 Hz/GHz/mW 2 . At an on-chip pump power of 240 μW, we obtain a maximum brightness of 22.0 MHz/GHz and a maximum photon-pair generation rate of 9.19 MHz. At a low-pump power of 10 μW, Franson-type two-photon interference exhibits a visibility of 98.0 ± 0.2%, confirming high-quality time–energy entanglement. These results show that narrow bandwidth and high generation rate can be achieved simultaneously in CMOS-compatible silicon photonic sources, thereby advancing their use in quantum repeaters and scalable quantum networks.

arXiv:2511.22825•ACS Photonics•Apr 21, 2026•0 citations

Advanced photon-pair sources for chip-based quantum technology

Imad I. Faruque, Nathan Moses, Hugh Barrett +3 more

Quantum photonic entanglement generated from a photon-pair source is a crucial resource for many quantum technological implementations, for example, an entanglement-based global quantum network and metrology beyond classical limits. For the former, we require sufficient brightness to mitigate the loss to send the quantum state to a long distance. Additionally, to enable entanglement swapping, the heralded photons need to be spectrally pure and indistinguishable enabling high visibility quantum interference. Here, we discuss the required attributes and current benchmarks of the chip-scale photon-pair sources arguing that they are the prime candidate for the above applications.

Quantum Sensing and Nano Electronics and Photonics•Mar 5, 2026•0 citations

Quantum Light Generation Based on GaN Microring toward Fully On-Chip Source

Hong Zeng, Zhaoqin He, Yunru Fan +18 more

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.

Physical Review Letters•Mar 29, 2024•49 citations
The AlGaAsOI material platform offers great promise as a source of quantum states of light that can be utilized for enhanced sensing and metrology beyond the standard quantum limit. Here we focus on preliminary results from AlGaAsOI microring resonator sources that demonstrate a 1000-fold improvement in the brightness of entangled photon pairs compared to state-of-the-art chip-scale sources. The source maintains high single photon purity < 99% and time-energy entanglement visibility < 95%.
Quantum technology promises to deliver quantum computers, unbreakable communication and ultra-sensitive sensors. Quantum photonics is one of the prominent platforms of quantum technology which utilizes photons – often called flying qubits. Entanglement generated from a photon-pair source is a crucial resource for many quantum photonic implementations, for example, an entanglement-based global quantum network and metrology beyond classical limits. Here, we will discuss our recent results of chip-scale photon-pair sources in silicon photonics. These results are focused on improving brightness, spectral purity and indistinguishability of the photon-pair sources, for example, by engineering photonic structures and temporal pulse shaping. We have found that both methods have trade-offs among brightness, spectral purity and indistinguishability. Additionally, we have observed that generating a high-fidelity quantum state using a quantum photonic circuit requires sufficient isolation between the nonlinear photon-pair sources and the linear photonic circuit. It is crucial to remove the nonlinear effect of the strong pump both before and after the sources to limit the spurious photon-pair generation which contaminates the target quantum state.
Entangled photon-pair sources are essential components for emerging quantum information-processing technologies. Among various platforms, on-chip microresonators offer strong potential due to their resonant enhancement and suitability for wafer-scale integration. In this study, we demonstrate ultrabright entangled photon-pair generation from high- Q silicon microring resonators. By optimizing the device geometry and coupling configuration to suppress sidewall scattering and selectively excite the fundamental mode, we achieve single-mode resonance with an intrinsic Q -factor of 1.26 × 10 6 using only standard fabrication processes available in CMOS foundries. The resulting high- Q resonator yields a record-high brightness coefficient of 3.9 × 10 9 Hz/GHz/mW 2 . At an on-chip pump power of 240 μW, we obtain a maximum brightness of 22.0 MHz/GHz and a maximum photon-pair generation rate of 9.19 MHz. At a low-pump power of 10 μW, Franson-type two-photon interference exhibits a visibility of 98.0 ± 0.2%, confirming high-quality time–energy entanglement. These results show that narrow bandwidth and high generation rate can be achieved simultaneously in CMOS-compatible silicon photonic sources, thereby advancing their use in quantum repeaters and scalable quantum networks.
Quantum photonic entanglement generated from a photon-pair source is a crucial resource for many quantum technological implementations, for example, an entanglement-based global quantum network and metrology beyond classical limits. For the former, we require sufficient brightness to mitigate the loss to send the quantum state to a long distance. Additionally, to enable entanglement swapping, the heralded photons need to be spectrally pure and indistinguishable enabling high visibility quantum interference. Here, we discuss the required attributes and current benchmarks of the chip-scale photon-pair sources arguing that they are the prime candidate for the above applications.
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.