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A recent breakthrough in frequency conversion has achieved substantial bandwidth, opening new possibilities for more efficient quantum information transfer and advanced integrated photonic systems.
Advancements in quantum information technology are enabling faster and more efficient data transfer. A major challenge, however, lies in transferring qubits—the fundamental units of quantum information—across different wavelengths while preserving their crucial properties, such as coherence and entanglement.
As reported in Advanced Photonics, researchers from Shanghai Jiao Tong University (SJTU) recently made significant strides in this area by developing a novel method for broadband frequency conversion, a crucial step for future quantum networks.
A new camera system is making it possible for humans to see colors in the way animals do, opening up a vivid new perspective on the natural world.
Led by researcher Vera Vasas, who has spent years studying animal vision, this innovative project is changing how we understand what animals actually see.
In collaboration with colleagues from the Hanley Color Lab at George Mason University, Vasas has developed a tool that lets us experience the world through the eyes of different species.
How much light do we really need at night for urban traffic, life? are we more secure with more light? or have we put too much?
Street lights across the country, particularly in rural areas, may be replaced with cleaner alternatives to cut a £3bn bill.
Here we propose a novel protected erasure qubit, the Floquet fluxonium molecule (FFM). The FFM qubit exhibits (i) extremely long predicted logical coherence times and relatively long erasure lifetimes, (ii) a simple superconducting circuit structure, and (iii) high-fidelity single-qubit gates, which are much faster than the coherence timescale. Based on a Floquet-driven pair of inductively coupled fluxonium circuits [13–15], the FFM is a multi-DOF superconducting circuit with engineered, highly coherent quasieigenstates.
Our key technical contribution is a novel form of Floquet protection in a multi-DOF qubit, which strongly suppresses phase-flip errors, removing them at first and second order in the flux noise. The combination of drive and multi-DOF allows the low-lying eigenstates to be disjoint and delocalized with a nonvanishing energy gap. The second-order sweet spot has no analogue in the single-DOF circuits that have been studied thus far [16–18]; in fact, in single-DOF circuits there is a generic trade-off between bit-and phase-flip errors arising from the inability to keep two eigenstates simultaneously disjoint and flux delocalized using accessible circuit QED Hamiltonians [19].
The higher-order phase-flip insensitivity allow the predicted coherence time of the FFM qubit to significantly outperform other multi-DOF circuits. These include the following: the dual-rail erasure transmon, with experimentally achieved logical lifetimes of approximately ms and erasure lifetimes of approximately [12]; the dual-rail cavity, with logical lifetimes predicted [10] (achieved [11]) at approximately ms (3 ms), limited by cavity and ancilla dephasing, and erasure lifetimes of approximately in both cases; and the cold echo qubit, with predicted logical lifetime of ms with erasure rates unreported [8]. Theoretically, we find the FFM exhibits long bit-flip coherence times of approximately 50 ms while suppressing phase flips even further, along with a 500-erasure lifetime.
Inspired by the external skeleton of a spider, the robot leg is more flexible than conventional robots.
A small robot that resembles a spider’s leg has been developed by engineers at the University of Tartu. Inspired by nature, the fingernail-long leg is more flexible than conventional robots.
Its dexterous movements are expected to help people rescued from rubble and other danger zones in the future.
Continue reading “Fingernail-sized super-flexible robot can aid in rescue ops” »
Recently, two independent research groups have shown that the brain codes for zero much as it does for other numbers, on a mental number line. But, one of the studies found, zero also holds a special status in the brain.
In recent years, research started to uncover how the human brain represents numbers, but no one examined how it handles zero. Now two independent studies, led by Nieder and Barnett, respectively, have shown that the brain codes for zero much as it does for other numbers, on a mental number line. But, one of the studies found, zero also holds a special status in the brain.
“The fact that [zero] represents nothing is a contradiction in itself,” said Carlo Semenza, a professor emeritus of neuroscience at the University of Padua in Italy who wasn’t involved in either study. “It looks like it is concrete because people put it on the number line — but then it doesn’t exist. … That is fascinating, absolutely fascinating.”
Continue reading “How the Human Brain Contends With the Strangeness of Zero” »
Actin, a family of proteins that help give cells their shape, are abundant throughout the body.
Humans aren’t the only ones who grow forgetful as they age—fruit flies do, too. But because fruit flies have a lifespan of only about two months, they can be a useful model for understanding the cognitive decline that comes with aging.
A new study published in Nature Communications shows that when a common cell structural protein called filamentous actin, or F-actin, builds up in the brain, it inhibits a key process that removes unnecessary or dysfunctional components within cells, including DNA, lipids, proteins and organelles.
There are rare cells in the gut called enteroendocrine cells (EECs) that could be manipulated in a variety of ways to detect or treat disease.
The trillions of microbes in our gastrointestinal tract, known as the gut microbiome, are crucial to the body; the gut microbiome aids in digestion, nutrient absorption, and influences our health in different ways. But the body also has to be protected from all of those microbes, which are kept behind a tight barrier. But if the intestinal barrier is dysfunctional, or leaky, serious problems can arise.
Continue reading “How Rare Intestinal Cells May Work as a Kind of Therapeutic Sensor” »
Organization runs deep in our family tree, if we use the literal definition of “organize”: to be furnished with organs. Eukaryotes emerged billions of years ago, bringing with them the copious benefits of compartmentalization.
All modern multicellular life — all life that any of us regularly see — is made of cells with a knack for compartmentalization. Recent discoveries are revealing how the first eukaryote got its start.
