Researchers Develop Scalable Method to Create Single-Photon Emitter Arrays in Boron Nitride
Scientists have demonstrated a three-step fabrication process using focused ion beam milling, carbon deposition, and thermal annealing to create deterministic single-photon emitters in hexagonal boron nitride with ~89% yield. Single-photon emitters are critical components for quantum computing and integrated photonic circuits, but have been difficult to produce reliably at room temperature in van der Waals materials. This lithography-free approach offers a scalable pathway for manufacturing on-demand emitter arrays needed for practical quantum photonics applications.
Researchers have developed a novel three-step fabrication process for generating spatially controlled arrays of single-photon emitters (SPEs) in hexagonal boron nitride (hBN), a van der Waals material. The method combines site-selective gallium focused ion beam milling, nanoscale conformal carbon deposition, and subsequent thermal annealing. The process achieved a site-correlated emitter yield of approximately 89% across 100 fabrication sites, with the best-performing emitters exhibiting high purity as measured by second-order autocorrelation. The researchers claim this is the first lithography-free, direct-write approach combining these three techniques to deterministically generate hBN single-photon emitters. The reproducibility of the method was validated across multiple independently fabricated samples, establishing a scalable pathway toward on-demand SPE arrays for integrated quantum photonics applications.
What's missing
The study does not discuss potential scalability limitations beyond the 100 fabrication sites demonstrated, cost comparisons with alternative SPE generation methods, or practical timelines for integration into commercial quantum photonic systems. Additionally, the paper does not address potential environmental stability or long-term performance degradation of the emitters under operational conditions.
What different sources said
- arXiv physicsCenter
Deterministic Single-Photon Emitter Arrays in Hexagonal Boron Nitride by Carbon-Assisted Focused Ion Beam Engineering
Related
Genetic Drift, Not Selection, Drives Rapid Feather Color Evolution in Island Bird Radiation
A new study of an island bird radiation found that rapid evolution of feather coloration is driven primarily by genetic drift in small populations rather than sexual or ecological selection. The research integrated whole-genome data with detailed plumage measurements across complete species sampling to test whether signaling trait evolution correlates with speciation rates. The findings suggest that neutral demographic processes play a central role in generating phenotypic diversity during island radiations, challenging assumptions about the mechanisms driving rapid evolution.
New AI Model Improves Prediction of Therapeutic Peptide Function from Protein Sequences
Researchers developed a lightweight CNN classifier that predicts whether peptide sequences have therapeutic properties, trained on a database of 54,655 peptides across 48 functional categories. The model uses a novel negative sampling strategy to reduce false positive rates from over 60% in previous approaches to 2.1%. This advancement could accelerate drug discovery by enabling faster computational screening of peptide candidates before expensive experimental testing.
Study Shows Different Metabolic Stress Models Produce Distinct Effects on Human Neuronal Networks
Researchers tested three common in vitro metabolic stress models on human-derived neuronal networks and found each produced different patterns of neuronal activity and cell damage. The models tested were hypoxia alone, oxygen-glucose deprivation (OGD), and hypoxia combined with glutamate exposure. The findings suggest that choice of experimental model significantly affects results and that combining electrophysiological and structural analyses is important for accurately assessing metabolic stress in stroke research.