Researchers Demonstrate Quantum Randomness Amplification on Silicon Photonic Chip
Scientists have demonstrated the first semi-device-independent (SDI) randomness amplification protocol implemented on an integrated silicon photonic chip, achieving a throughput of 20 Mbps. The work introduces a novel entropy certification technique that produces tighter security bounds than existing methods and remains valid even when preparation and measurement devices share quantum correlations. The advance could enable portable, high-security quantum cryptographic hardware compatible with existing telecom infrastructure.
A research team has reported the first on-chip implementation of semi-device-independent (SDI) quantum randomness amplification, a cryptographic primitive that converts biased, partially compromised random seeds into uniformly distributed private bits. The experiment was carried out on an integrated silicon photonic chip and achieved a throughput rate of 20 Mbps, a level the authors consider suitable for practical deployment. Central to the result is a new entropy certification technique that yields strictly tighter von Neumann entropy bounds than prior approaches, strengthening the security guarantees of the protocol. Crucially, the method remains secure even when the preparation and measurement devices share quantum correlations, addressing a potential vulnerability in earlier SDI schemes. SDI protocols occupy a middle ground between fully device-independent protocols—which offer the highest theoretical security but are difficult to scale—and standard quantum random number generators that rely on stronger device trust assumptions. The silicon photonic platform is compatible with standard telecom wavelengths, suggesting a pathway toward integrating this technology into portable consumer or network devices. The preprint was submitted to arXiv on 10 June 2026 and has not yet undergone formal peer review.
What's missing
As a preprint, the work has not yet been peer-reviewed, so independent validation of the security proofs and experimental claims is pending. The paper does not appear to report a comparison against existing commercial quantum random number generators in terms of cost, device footprint, or power consumption, which would be relevant for assessing practical competitiveness. Long-term stability and performance of the silicon photonic chip under real-world operating conditions are not addressed.
What different sources said
- arXiv physicsCenter
On-Chip Quantum Randomness Amplification
Related
Gut Bacteria Enzyme Found to Break Down Heat-Processed Food Compounds, Producing Novel Biogenic Amines
Researchers have discovered that an enzyme in common gut bacteria can degrade N-epsilon-carboxymethyllysine (CML), a compound formed during thermal food processing, producing previously unknown biogenic amines. The enzyme, ornithine decarboxylase SpeC from enterobacteria, acts on CML and related modified lysine derivatives through a low-level 'underground' catalytic activity. This finding suggests a previously unrecognized communication axis between thermally processed dietary compounds and gut microbial physiology, with potential implications for host health.
Full-Length Gene Sequencing Reveals Two Distinct Bacterial Communities in Black-Legged Ticks Expanding Into Canada
Researchers used Oxford Nanopore full-length 16S rRNA gene sequencing to characterize the microbiome of Ixodes scapularis black-legged ticks collected in Nova Scotia, Canada, distinguishing between tick-adapted bacteria and environmentally acquired bacteria. The study comes as I. scapularis — the primary vector of Lyme disease — is rapidly expanding northward into Canada due to climate change. The findings suggest that environmentally derived bacteria in tick microbiomes are not mere contamination, which has implications for how tick microbiome data is collected and interpreted across surveillance studies.
Study Identifies Metabolic Link Between Cell Envelope Stress and Biofilm Formation in Bacteria
Researchers have discovered that the metabolite acetyl-CoA directly inhibits enzymes that degrade the bacterial signaling molecule c-di-GMP, connecting cell envelope biosynthesis stress to biofilm formation in Pseudomonas aeruginosa. The study found that sub-inhibitory concentrations of antibiotics targeting early peptidoglycan biosynthesis — but not other antibiotic classes — elevate c-di-GMP levels by reducing phosphodiesterase activity, with acetyl-CoA competing for the enzyme active site. Because the relevant enzyme domain is broadly conserved across bacterial species, this checkpoint mechanism may be widespread and could have implications for understanding antibiotic-induced biofilm responses.