Aug 2026· Nano letters (Print)· Vol 26 34, pp.
11370-11377
· 0 citations· 42 references
Medicine
Abstract
Nanoscale quantum light sources are essential building blocks for integrated quantum photonic systems. Here, we report a wavelength-scale entangled-photon source based on van der Waals-engineered NbOBr2 and benchmark its performance for telecom-wavelength quantum light generation. By exploiting the material's second-order nonlinearity, we generate quantum-correlated photon pairs via spontaneous parametric down-conversion. We then use a 90° twisted stacking to induce quantum interference in photon-pair generation, yielding polarization-entangled photons. This approach enables tunability of the quantum optical state via control of the excitation laser polarization. We experimentally obtain entanglement fidelities exceeding 95% for Bell states, along with a high coincidence-to-accidental ratio of ∼335 and a brightness approximately 1 order of magnitude higher than recently reported telecom sources based on transition metal dichalcogenide two-dimensional materials. These results establish twisted van der Waals engineering as a powerful platform for highly tunable, high-brightness quantum light sources at telecom wavelengths.
The realization of quantum light sources is crucial for advancing quantum technologies. Two‐dimensional van der Waals (vdW) materials offer a compelling platform for ultracompact entangled photon‐pair sources due to their strong optical nonlinearities and relaxed phase‐matching constraints. Here, the generation of enta...
Shao-Hua Fu, Divyanshu Kumar, Xiao-Dong Yang et al.· Advanced Photonics Research· 0 citations
Quantum nonlocality, typically revealed through entanglement distribution across quantum networks, is a cornerstone of quantum information science. Long-distance distribution of entanglement requires the information carrier, i.e. flying photons, to operate in the minimum-loss telecom band of optical fiber. While extens...
Dong-Fei Huang, Jian Wang, Xiao-Long Zhou et al.· 0 citations
Wavelength-tunable sources of single photons are key devices for scaling up optical quantum technologies. In this context, individual quantum dots (QDs) embedded in broadband photonic nanostructures are particularly appealing. The nanopost cavity, which is built with a segment of photonic wire, offers a rare combinatio...
Maxime Gaignard, L. De Santis, M. Nahra et al.· APL Quantum· 0 citations
Chiral light-matter interactions lie at the heart of emerging technologies such as quantum network protocols and quantum logic gates. In the few photon regime, it has been shown that chiral interactions between photons and a waveguide-embedded two-level quantum emitter can break reciprocity and impart a directional $\p...
Cedric Dufresne, Annabelle Makowski, N. Rotenberg· 1 citation
Over the past twenty-five years, intensive research on epitaxial semiconductor quantum dots (QDs) has transformed these systems from random quantum emitters embedded in a noisy solid-state environment into one of the most efficient platforms for generating not only single photons but also multiple entangled photons in...
P. Senellart· Physical Review Letters· 0 citations
Polarization-entangled photon pairs are essential resources for quantum information technologies, yet realizing compact sources with intrinsically controllable entanglement remains challenging. Van der Waals (vdW) nonlinear materials such as NbOCl2 provide atomically thin platforms for quantum light generation, yet the...
Xin Zeng, Wen-Na Du, Yun-Kun Wu et al.· 0 citations
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