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Quantum protocol achieves Heisenberg-limited measurement precision with robust spin states

Researchers from the National University of Singapore (NUS) have achieved exciting progress in quantum metrology, a field that harnesses quantum effects to make measurements with unprecedented accuracy. Their newly developed protocol could potentially benefit emerging technologies such as navigation and sensing of extremely weak signals.

Quantum metrology exploits the unique properties of to achieve sensitivities far exceeding classical limits. Pushing beyond the so-called standard quantum limit (SQL) to reach the ultimate Heisenberg limit (HL) typically requires highly entangled quantum states, such as Greenberger–Horne–Zeilinger (GHZ) states. However, these states are extremely challenging to generate, maintain, and measure, as they are highly susceptible to and readout errors, which are major obstacles for practical deployment.

Led by Professor Gong Jiangbin from the Department of Physics at the NUS Faculty of Science, the research team has developed a novel strategy that eliminates these roadblocks. Their method leverages quantum resonance dynamics in a periodically driven spin system, a well-studied model called the quantum kicked top.

Manipulation of light at the nanoscale helps advance biosensing

Traditional medical tests often require clinical samples to be sent off-site for analysis in a time-intensive and expensive process. Point-of-care diagnostics are instead low-cost, easy-to-use, and rapid tests performed at the site of patient care. Recently, researchers at the Carl R. Woese Institute for Genomic Biology reported new and optimized techniques to develop better biosensors for the early detection of disease biomarkers.

People have long been fascinated with the iridescence of peacock feathers, appearing to change color as light hits them from different angles. With no pigments present in the feathers, these colors are a result of light interactions with nanoscopic structures, called photonic crystals, patterned across the surface of the feathers.

Inspired by biology, scientists have harnessed the power of these photonic crystals for biosensing technologies due to their ability to manipulate how light is absorbed and reflected. Because their properties are a result of their nanostructure, photonic crystals can be precisely engineered for different purposes.

Virtual reality software uncovers new details in pediatric heart tumors

New cutting-edge software developed in Melbourne can help uncover how the most common heart tumor in children forms and changes. And the technology has the potential to further our understanding of other childhood diseases, according to a new study.

The research, led by Murdoch Children’s Research Institute (MCRI) and published in Genome Biology, found the software, VR-Omics, can identify previously undetected cell activities of cardiac rhabdomyoma, a type of benign heart tumor.

Developed by MCRI’s Professor Mirana Ramialison, VR-Omics is the first tool capable of analyzing and visualizing data in both 2D and 3D virtual reality environments. The innovative technology aims to analyze the spatial genetic makeup of to better understand a specific disease.

Proteins important in brain communication have different roles than previously thought

Cellular communication between neurons within our brain is complex and busy, much like a USPS mailroom.

To keep things running smoothly, the brain uses specialized molecules, termed alpha-2-delta (α2δ) proteins, to coordinate the sending and receival of signals between nerve cells in the brain.

Genetic variations in these types of proteins can impact important brain messaging and function, resulting in chronic pain, , epilepsy, migraines, and other conditions.

RisingAttacK: New technique can make AI ‘see’ whatever you want

Researchers have demonstrated a new way of attacking artificial intelligence computer vision systems, allowing them to control what the AI “sees.” The research shows that the new technique, called RisingAttacK, is effective at manipulating all of the most widely used AI computer vision systems.

At issue are so-called “adversarial attacks,” in which someone manipulates the data being fed into an AI system to control what the system sees, or does not see, in an image. For example, someone might manipulate an AI’s ability to detect , pedestrians or other cars—which would cause problems for . Or a hacker could install code on an X-ray machine that causes an AI system to make inaccurate diagnoses.

“We wanted to find an effective way of hacking AI vision systems because these vision systems are often used in contexts that can affect human health and safety—from autonomous vehicles to health technologies to ,” says Tianfu Wu, co-corresponding author of a paper on the work and an associate professor of electrical and computer engineering at North Carolina State University.

Photon ‘time bins’ and signal stability show promise for practical quantum communication via fiber optics

Researchers at the Leibniz Institute of Photonic Technology (Leibniz IPHT) in Jena, Germany, together with international collaborators, have developed two complementary methods that could make quantum communication via fiber optics practical outside the lab.

One approach significantly increases the amount of information that can be encoded in a ; the other improves the stability of the quantum signal over long distances. Both methods rely on standard telecom components—offering a realistic path to secure through existing fiber networks.

From hospitals to government agencies and industrial facilities—anywhere must be kept secure—quantum communication could one day play a key role. Instead of transmitting electrical signals, this technology uses individual particles of light—photons—encoded in delicate quantum states. One of its key advantages: any attempt to intercept or tamper with the signal disturbs the , making eavesdropping not only detectable but inherently limited.

First-ever collisions of oxygen at the Large Hadron Collider

“The current operating mode, in which a beam of protons collides with a beam of oxygen ions, is the most challenging,” points out Roderik Bruce, an LHC ion specialist. “This is because the inside the accelerator affects protons and oxygen ions differently, due to their different charge-to-mass ratios. In other words, without corrections the two beams would collide in different places at each turn.”

To overcome this problem, the engineers are carefully adjusting the frequency of revolution and the momentum of each beam, so that the collisions take place right at the heart of the LHC’s four main experiments: ALICE, ATLAS, CMS and LHCb.

But these four experiments are not the only ones to be involved in this special campaign. Last week, the LHCf experiment, which studies cosmic rays using the small-angle particles created during collisions, installed a detector along the LHC beamline, 140 meters from the ATLAS experiment’s point, which it will use for proton–oxygen run. This detector will later be removed and replaced by a calorimeter, which will provide additional data during the oxygen–oxygen and neon–neon collisions.

Platform enables tunable photonic crystals with integrated spin-orbit coupling and controlled laser emission

A team of researchers has developed a novel method for using cholesteric liquid crystals in optical microcavities. The platform created by the researchers enables the formation and dynamic tuning of photonic crystals with integrated spin-orbit coupling (SOC) and controlled laser emission. The results of this research have been published in the journal Laser & Photonics Reviews. The team is from the Faculty of Physics at the University of Warsaw, the Military University of Technology, and the Institut Pascal at Université Clermont Auvergne.

“A uniform lying helix (ULH) structure of a cholesteric phase liquid crystal is arranged in the optical cavity. The self-organized helix structure with the axis lying in the plane of the cavity acts as a one-dimensional periodic photonic lattice. This is possible due to the unique properties of liquid crystals, which are elongated molecules that resemble a pencil,” explains Prof. Jacek Szczytko from the Faculty of Physics at the University of Warsaw, where research on novel optical microcavities is being conducted.

A cholesteric structure is a made up of layers of almost parallel oriented molecules lying in a single plane. From layer to layer, the orientation of the molecules is gently twisted, which altogether builds up a helical structure reminiscent of DNA helixes or ‘piggyback’ noodles. The direction perpendicular to the layers of molecules determines the axis of the helix formed.

Physicists Unlock New Path to Weighing the Universe’s “Ghost Particle”

Silver-110’s decay reveals a promising path to measure antineutrino mass. New data could reshape future neutrino studies. Neutrinos and antineutrinos are fundamental particles that possess mass, although their exact value remains unknown. Recent high-precision atomic mass measurements carried out