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    Physics

    Optical data processing benefits from new kind of mobillity

    Mode control is essential for optical communications and data processing technologies. Whether it’s connections and switches in data transmission lines or some sort of non-reciprocal device for optical circuits, the ability to control, for example, whether the output mode will be even or odd for a given input mode is key. Now, researchers in China and Canada have demonstrated how to achieve efficient optical mode transfer in more compact devices than previously possible by exploiting “exceptional points” with new mobile properties. …read more

    Source:: Physorg Physics

          

    Quantum-entangled light from a vibrating membrane

    Entanglement, a powerful form of correlation among quantum systems, is an important resource for quantum computing. Researchers from the Quantum Optomechanics group at the Niels Bohr Institute, University of Copenhagen, recently entangled two laser beams through bouncing them off the same mechanical resonator, a tensioned membrane. This provides a novel way of entangling disparate electromagnetic fields, from microwave radiation to optical beams. In particular, creating entanglement between optical and microwave fields would be a key step towards solving the long-standing challenge of sharing entanglement between two distant quantum computers operating in the microwave regime. The result is now published in Nature Communications. …read more

    Source:: Physorg Physics

          

    Extreme high-frequency signals enable terabits-per-second data links

    Using the same technology that allows high-frequency signals to travel on regular phone lines, researchers tested sending extremely high-frequency, 200 GHz signals through a pair of copper wires. The result is a link that can move data at rates of terabits per second, significantly faster than currently available channels. …read more

    Source:: Physorg Physics

          

    New quantum technology could help diagnose and treat heart condition

    Atrial fibrillation (AF) is a heart condition that causes an irregular and abnormally fast heart rate, potentially leading to blood clots, stroke, heart failure and other heart-related complications. While the causes of AF are unknown, it affects around one million people in the UK with cases predicted to rise at a great cost to the NHS. …read more

    Source:: Physorg Physics

          

    A new search for axion dark matter rules out past numerical predictions

    The ADMX collaboration, a group of researchers working at universities across the U.S. and Europe, has recently performed a new search for invisible axion dark matter using a cavity haloscope and a low-noise Josephson parametric amplifier. Cavity haloscopes are sensitive instruments designed to detect and study halos around luminous bodies or other physical phenomena. Josephson parametric amplifiers, on the other hand, are technological tools that can be used to manipulate quantum states of microwave light fields. …read more

    Source:: Physorg Physics

          

    High Altitude Water Cherenkov observatory tests speed of light

    New measurements confirm, to the highest energies yet explored, that the laws of physics hold no matter where you are or how fast you’re moving. Observations of record-breaking gamma rays prove the robustness of Lorentz Invariance—a piece of Einstein’s theory of relativity that predicts the speed of light is constant everywhere in the universe. The High Altitude Water Cherenkov observatory in Puebla, Mexico detected the gamma rays coming from distant galactic sources. …read more

    Source:: Physorg Physics

          

    Surfing the waves: Electrons break law to go with the flow

    If you see people walking down a street and coming to a junction, it’s difficult to predict which direction they might take. But, if you see people sitting in separate boats, floating down a stream, and the stream splits into two channels, it’s likely that most, if not all, of them will be carried down one channel, the channel that has the stronger flow. …read more

    Source:: Physorg Physics

          

    Resolving spatial and energetic distributions of trap states in metal halide perovskite solar cells

    In a new report published on Science, Zhenyi Ni and a research team in applied physical sciences, mechanical and materials engineering and computer and energy engineering in the U.S. profiled spatial and energetic distributions of trap states or defects in metal halide perovskite single-crystalline polycrystalline solar cells. The researchers credited the photovoltaic performance of metal halide perovskites (MHPs) to their high optical absorption coefficient, carrier mobility, long charge-diffusion length and small Urbach energy (representing disorder in the system). Theoretical studies have demonstrated the possibility of forming deep charge traps at the material surface due to low formation energy, structural defects and grain boundaries of perovskites to guide the development of passivation techniques (loss of chemical reactivity) in perovskite solar cells. Charge trap states play an important role during the degradation of perovskite solar cells and other devices. Understanding the distribution of trap states in their space and energy can clarify the impact of charge traps (defects) on charge transport in perovskite materials and devices for their optimal performance. …read more

    Source:: Physorg Physics

          

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