Lifeboat Foundation

A team of researchers affiliated with several institutions in China has used drones to create a prototype of a small airborne quantum network. In their paper published in the journal Physical Review Letters, the researchers describe sending entangled particles from one drone to another and from a drone to the ground.

Computer scientists, physicists and engineers have been working over the last several years toward building a usable quantum network —doing so would involve sending entangled particles between users and the result would be the most secure network ever made. As part of that effort, researchers have sent entangled particles over fiber cables, between towers and even from satellites to the ground. In this new effort, the researchers have added a new element—drones.

To build a long-range quantum network, satellites appear to be the ideal solution. But for smaller networks, such as for communications between users in the same city, another option is needed. While towers can be of some use, they are subject to weather and blockage, intentional or otherwise. To get around this problem, the researchers used drones to carry the signals.

A small prototype of a drone-based quantum network has successfully relayed a quantum signal over a kilometer of free space.

The airwaves are chock full of “classical” information from cell phones, radio stations, and Wi-Fi hubs, but one day those waves could be carrying quantum encrypted messages or data input for a quantum computer. A new experiment has used a pair of hovering drones to dole out quantum information to two ground stations separated by 1 km [1]. This demonstration could lead to a drone-based quantum network that could be positioned—and easily repositioned—over a city or rural area.

Quantum communication promises fully secure message sharing. For example, two users could exchange encrypted messages using “entangled” photons, pairs of particles with a unique quantum-mechanical relationship. For every pair, one photon would be sent to each of the users, who would be alerted to any eavesdropping by a loss of entanglement between the photons. One of the most common methods for sending such quantum encrypted messages relies on optical fibers (see Viewpoint: Record Distance for Quantum Cryptography). But in fibers, a large fraction of the photons scatter before reaching their destination. More photons can survive if quantum information is transmitted through the atmosphere, as in the quantum link established using a Chinese satellite in 2018 (see Focus: Intercontinental, Quantum-Encrypted Messaging and Video). However, satellites are expensive and difficult to adapt to changing demands on the ground.

In Oranmore, a town on the west coast of Ireland, residents have turned to ordering books, groceries, and their morning coffee via drone delivery.

The Federal Aviation Administration has released new and looser rules for flying drones over highly populated areas and at night, effectively laying a welcome mat for future aerial deliveries of takeout food, Amazon packages, prescription drugs — you name it.

Why it matters: While the prospect of Jetsons-style convenience with less street gridlock is tantalizing, there are still plenty of logistical hurdles, and it will take some time for cities to figure out how to manage low-altitude air traffic as routinely as they do today’s road traffic.

Driving the news: FAA rules — handed down late last month — will require drones flying over cities to use remote identification technology, so people on the ground can tell what they’re doing and who owns them.

PORTLAND, Ore. — Skyward, A Verizon company, and UPS Flight Forward today announced collaborative efforts to deliver retail products with drones connected to Verizon 4G LTE, as well as 5G testing and integration for delivery. The companies aim to deliver retail products via connected drones at The Villages in Florida.

“We will need the ability to manage and support multiple drones, flying simultaneously, dispatched from a centralized location, operating in a secure and safe environment. To do this at scale, alongside Verizon and Skyward, we’ll need the power of 5G,” said Carol B. Tomé, CEO of UPS.

“We’re just beginning to see how the power of 5G Ultra Wideband will transform the way businesses operate,” said Rima Qureshi, Chief Strategy Officer at Verizon. “By partnering with UPS and other innovative companies, we can learn from each other’s expertise and collaborate to create solutions that help move the world forward.”

The arrival of government-operated autonomous police robots does not look like predictions in science fiction movies. An army of robots with gun arms is not kicking down your door to arrest you. Instead, a robot snitch that looks like a rolling trash can is programmed to decide whether a person looks suspicious —and then call the human police on them. Police robots may not be able to hurt people like armed predator drones used in combat— yet —but as history shows, calling the police on someone can prove equally deadly.

Long before the 1987 movie Robocop, even before Karel Čapek invented the word robot in 1920, police have been trying to find ways to be everywhere at once. Widespread security cameras are one solution—but even a blanket of CCTV cameras couldn’t follow a suspect into every nook of public space. Thus, the vision of a police robot continued as a dream, until now. Whether they look like Boston Dynamics’ robodogs or Knightscope’s rolling pickles, robots are coming to a street, shopping mall, or grocery store near you.

Continue reading “Police Robots Are Not a Selfie Opportunity, They’re a Privacy Disaster Waiting to Happen” »

The odd, wavy pattern that results from viewing certain phone or computer screens through polarized glasses has led researchers to take a step toward thinner, lighter-weight lenses. Called moiré, the pattern is made by laying one material with opaque and translucent parts at an angle over another material of similar contrast.

A team of researchers from Tokyo University of Agriculture and Technology, TUAT, in Japan have demonstrated that moiré metalenses—tiny, patterned lenses composed of artificial ‘meta’ atoms—can tune focal length along a wider range than previously seen. They published their results on November 23 in Optics Express.

“Metalenses have attracted a lot of interest because they are so thin and lightweight, and could be used in ultra-compact imaging systems, like future smart phones, virtual reality goggles, drones or microbots,” said paper author Kentaro Iwami, associate professor in the TUAT Department of Mechanical Systems Engineering.

“It’s all thanks to the sacrifice of the hawk moth Manduca sexta, which is an extremely sensitive smeller, like other moths. When a moth picks up a scent, like that of a flower or a potential mate, the odors bind to proteins inside the antennae, and these proteins in turn activate neurons dedicated to specific chemicals. That means the antennae are producing electrical signals that researchers can tap into. In order to create a sort of moth-drone cyborg, mechanical engineer Melanie Anderson of the University of Washington cold-anesthetized a hawk moth in a freezer before removing its antennae. Then she cut both ends off of a single antenna and attached each to an itty-bitty wire hooked up to an electrical circuit. “A lot like a heart monitor, which measures the electrical voltage that is produced by the heart when it beats, we measure the electrical signal produced by the antenna when it smells odor,” says Anderson, lead author on a recent paper in the journal Bioinspiration and Biomimetics describing the research. “And very similarly, the antenna will produce these spike-shaped pulses in response to patches of odor.””

Researchers slap a living antenna on a drone to give the machine an insanely keen sense of smell. Ladies and gentlemen, meet the “Smellicopter.”

Researchers demonstrate a new technique for suppressing back reflections of light—better signal quality for sensing and information technology.

Microresonators are small glass structures in which light can circulate and build up in intensity. Due to material imperfections, some amount of light is reflected backwards, which is disturbing their function.

Continue reading “Trapping light without back reflections” »