A topological source of quantum light

Mohammad Hafezi

Ping Xu, Chao Wu, Biao Yang +9 more

Abstract Non-Abelian topological charges herald a new epoch in topological classification, featuring multiple tangled-bandgaps that promise conceptual breakthroughs. Here, we engineered the first photonic non-Abelian topological insulators by the integrated waveguide and demonstrating a novel quantum light source that exhibits non-Abelian topological features. We experimentally observed the generation of a discrete-band two-photon source with extended wavelengths of signal and idler photons lying in S and L bands, respectively, exhibiting an enhanced coincidence-to-accidental ratio. Additionally, we demonstrated the robustness of this quantum light sources by introducing significant disorders. Such non-Abelian two-photon source can be engineered within the transmission window of the material as well as provides a natural scheme for optimizing the spectral purity towards robust indistinguishable photons. Our scheme paves the way for non-Abelian topological quantum device applications in quantum light sources engineering, quantum computing and quantum simulation as well as shedding light on interdisciplinary studies of non-Abelian physics and quantum optics.

S. Chua

Armando Perez Leija, Andrea Blanco‐Redondo

Boubacar Kanté

Single photon sources play a fundamental role in quantum science and engineering. In the first part of the talk, I will present a deterministic quantum light source in silicon based on single emissive centers that emit in the telecom band [1]. In the second part of the talk, I will discuss a probabilistic source based on an interpretable inverse design cavity enhancing the efficiency of on-chip photon pair generation rate through nonlinear processes [2]. I will also discuss how topological disorder can enhance non-linearities on chip [3]. References. 1- W. Redjem*, Y. Zhiyenbayev*, W. Qarony* et al., “All-silicon quantum light source by embedding an atomic emissive center in a nanophotonic cavity,” Nat Commun 14, 3321 (2023). 2- Z. Jia, W. Qarony, J. Park, S. Hooten, D. Wen, Y. Zhiyenbayev, M. Seclì, W. Redjem, S. Dhuey, A. Schwartzberg, E. Yablonovitch, and B. Kanté, “Interpretable inverse-designed cavity for on-chip nonlinear photon pair generation,” Optica 10, 1529-1534 (2023). 3- Z. Jia, M. Seclì, A. Avdoshkin et al., “Disordered topological graphs enhancing nonlinear phenomena,” Sci. Adv. 9, 14 (2023).

Jonny Roberts, Robert James Young