Three Labs Report Quantum Photonics Breakthroughs Toward Smaller Scalable Devices

Three separate research teams this week reported advances in quantum photonics that could accelerate the development of smaller, more practical quantum devices — from fiber-integrated light sources to chip-scale multi-emitter platforms.

A Quantum Light Source on a Fiber Tip

Scientists at A*STAR's Quantum Innovation Centre in Singapore demonstrated a lens-free entangled photon-pair source by placing an ultrathin crystal of niobium oxide diiodide (NbOI₂) directly onto the end of an optical fiber. The device generates pairs of correlated photons through spontaneous parametric down-conversion without any bulk free-space optics, achieving a coincidence-to-accidental ratio (CAR) of up to approximately 4,600 — far exceeding the previous record of around 800 for similar van der Waals crystal sources. Graphene encapsulation protects the crystal from environmental degradation, and both the pump laser and the generated photon pairs travel entirely through optical fibers, eliminating alignment complexity. The work, posted to arXiv on March 25, provides what the authors describe as "a practical platform for future two-photon quantum interference experiments directly using optical fibers".

Optical Tornadoes from Liquid Crystals

Separately, physicists at the University of Warsaw, the Military University of Technology, and France's Institut Pascal CNRS reported creating "optical tornadoes" — laser light carrying orbital angular momentum in its lowest energy state — using topological defects called torons embedded in a liquid crystal microcavity. Published in Science Advances, the work showed that these self-organizing structures generate a synthetic gauge field that inverts the usual ordering of energy states, causing the ground state to carry angular momentum. "For the first time, we managed to obtain this effect in the ground state," said Prof. Guillaume Malpuech of Université Clermont Auvergne. "This is significant because the ground state is the most stable and the easiest for energy to accumulate in". Because light naturally settles into this state, lasing becomes easier to achieve — potentially enabling simpler photonic devices for optical communication and quantum technologies without complex nanofabrication.

Five Quantum Dots Interfere on a Single Chip

Researchers at Heriot-Watt University, collaborating with colleagues at Technical University, scaled quantum interference from two emitters to five independent quantum dots fabricated on a single chip. Using programmable spatial light modulators to shape the excitation and collection of single photons, the team compensated for manufacturing imperfections and spectral variations that had previously limited multi-emitter interference. The group verified interference through cooperative-emission measurements and Hong-Ou-Mandel two-photon interference, observing a peak bunching parameter of 1.52 — well above the 0.5 ceiling for two-dot systems. The results, posted to arXiv on March 27, establish what the researchers call "a route towards large-scale, programmable quantum photonic architectures," though they acknowledge that scaling well beyond five emitters while maintaining coherence remains an open engineering challenge.

China Tests Hybrid Engine for Next-Generation Stealth Battle Drones

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China has flight-tested a hybrid propulsion system designed to make small battlefield drones quieter, harder to detect, and capable of flying longer distances, according to a report broadcast on Friday by CCTV-7, China's military television channel.

The 60-kilowatt system, which was tested in December, combines fuel-powered and electric propulsion to address a longstanding tradeoff in drone design. Fuel-powered systems used in larger uncrewed aircraft deliver strong performance and long endurance but produce considerable noise and heat. Smaller battery-powered drones are quieter and less visible on infrared sensors but suffer from limited flight time

How the System Works

The hybrid unit generates electricity from fuel during flight, then allows the drone to switch to a quiet electric mode when stealth is required, according to the South China Morning Post, which first reported the CCTV-7 broadcast. This dual-mode capability would enable small drones to cover longer distances while maintaining low noise levels and reduced thermal signatures — qualities that could make them harder to detect and intercept on the battlefield.

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The system was developed by Sichuan Tianfu Light Power Technology, a state-backed firm that also unveiled the hybrid power unit alongside two turbofan engines at a low-altitude economy industry conference in late 2024. The company, which operates under the umbrella of China's Aero Engine Corporation, has been working to bring both the hybrid system and a larger 600-kilogram-force turbofan engine to commercialization.

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A Broader Drone Buildup

The hybrid propulsion test is one element in a sweeping Chinese effort to expand unmanned aerial capabilities. In February, China flew the CH-YH1000S, described as the world's first hybrid cargo drone, in Chongqing — a project that drew on a partnership between the aerospace sector and the country's electric vehicle industry. In December, the CH-7 stealth endurance drone completed its maiden flight. And in late March, state media broadcast a live demonstration of the Atlas drone swarm system, which allows a single operator to command up to 96 coordinated drones through an AI-driven kill chain.

Meanwhile, a Mitchell Institute report published this week revealed that China has stationed more than 200 obsolete J-6 fighter jets, converted into attack drones, at six air bases near the Taiwan Strait. Analysts said the converted jets would function like cruise missiles in the opening phase of any Taiwan conflict, designed to overwhelm air defenses by forcing expensive interceptors to be spent on cheap, expendable targets.

The Stealth Advantage

The hybrid propulsion breakthrough addresses a specific gap: giving small tactical drones the range of fuel-powered aircraft without sacrificing the stealth advantages of electric flight. As drone warfare shifts toward autonomous swarms and attrition-based strategies, the ability to operate quietly and evade infrared detection could prove decisive in contested airspace.

Scientists Discover Simple Amino Acid Cocktail That Boosts mRNA and CRISPR Delivery

A team of scientists at Biohub has found that co-injecting three common amino acids alongside lipid nanoparticles — the same delivery technology behind COVID-19 mRNA vaccines — can increase mRNA delivery to cells up to 20-fold and push CRISPR gene editing efficiency from roughly 25% to nearly 90% in a single dose, according to a study published Wednesday in Science Translational Medicine.

The discovery, led by Daniel Zongjie Wang and Shana O. Kelley, offers a strikingly simple workaround to one of the most persistent obstacles in genetic medicine: lipid nanoparticles, or LNPs, work far better in laboratory dishes than they do inside living organisms.

A Metabolic Bottleneck, Not a Design Flaw

Rather than attempting to engineer a better nanoparticle, the Biohub team investigated why cells in the body are so much worse at absorbing LNPs than cells grown in standard lab conditions. They found that when cells were cultured in a medium mimicking the nutrient-lean environment of human blood plasma, LNP uptake dropped 50% to 80%.

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Metabolic analysis traced the problem to suppressed amino acid pathways. "The field has spent enormous effort engineering nanoparticles," Wang said. "We found, however, that the cell's own metabolic state is an equally important — and addressable — part of the equation."

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Through systematic screening, the team identified an optimized supplement of methionine, arginine, and serine that restored and amplified the cellular uptake pathway. The cocktail worked across intramuscular, intratracheal, and intravenous delivery routes and was effective regardless of the specific lipid formulation or mRNA cargo used.

Striking Results in Preclinical Models:

In mice with acetaminophen-induced acute liver failure, LNPs carrying growth hormone mRNA produced only a 33% survival rate when administered alone. With the amino acid supplement, every mouse survived, therapeutic protein levels rose nearly nine-fold, and markers of liver damage dropped to near-healthy levels.

In a separate set of experiments targeting lung tissue with CRISPR-Cas9, a single dose without the supplement achieved editing efficiencies of 20% to 30%. Adding the amino acid cocktail pushed that figure to 85% to 90% — a result that could prove transformative for diseases like cystic fibrosis that demand efficient gene correction in the lungs.