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    On the way to Quantum Networks

    January 28, 2020, Categories  Technology/Electronics, Physics

    Picture of the single atom trap. In the ultra-high vacuum glass cell a single Rubidium atom is captured, which later will be entangled with a photon. Photo: C. Olesinski/LMU
    Picture of the single atom trap. In the ultra-high vacuum glass cell a single Rubidium atom is captured, which later will be entangled with a photon. Photo: C. Olesinski/LMU

    Physicists at LMU, together with colleagues at Saarland University, have successfully demonstrated the transport of an entangled state between an atom and a photon via an optic fiber over a distance of up to 20 km – thus setting a new record.

    ‘Entanglement’ describes a very particular type of quantum state which is not attributed to a single particle alone, but which is shared between two different particles. It irrevocably links their subsequent fates together – no matter how far apart they are – which famously led Albert Einstein to call the phenomenon as “spooky action at a distance”...

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    Well-designed Substrates make Large Single Crystal Bi-/Tri-Layer Graphene Possible

    January 22, 2020, Categories  Physics, Technology/Electronics, Chemistry/Nanotechnology

    Figure 1. Preparation and characterization of Cu/Ni(111) foils.
    Preparation and characterization of Cu/Ni(111) foils. (a) Schematic of the preparation of the Cu/Ni(111) foils shows that Ni films are electroplated on both sides of a Cu(111) foil, which is followed by heating in a chemical vapor deposition chamber at 1050 oC for 5-7 hours to obtain the Cu/Ni(111) foil. By controlling the concentration of nickel (Ni), IBS researchers could obtain bilayer and trilayer graphene with the desired stacking order and large area. (b) A photograph of a piece of Cu/Ni(111) alloy foil (3 cm × 5 cm in size). (c) X-ray pattern taken from different regions across the whole sample (3 cm × 5 cm). (d) Electron backscatter diffraction map indicating the uniform (111) orientation of the prepared Cu foils.

    IBS researchers fabricate single crystal copper nickel alloy...

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    Ingestible Medical Devices can be Broken Down with Light

    January 19, 2020, Categories  Physics, Health/Medical, Biology/Biotechnology

    MIT engineers demonstrated a bariatric balloon that can be inflated in the stomach and then degraded by shining light on the seal, which is made of a novel light-sensitive polymer.
    Image: Ritu Raman

    New light-sensitive material could eliminate some of the endoscopic procedures needed to remove gastrointestinal devices

    A variety of medical devices can be inserted into the gastrointestinal tract to treat, diagnose, or monitor GI disorders. Many of these have to be removed by endoscopic surgery once their job is done. However, MIT engineers have now come up with a way to trigger such devices to break down inside the body when they are exposed to light from an ingestible LED.

    The new approach is based on a light-sensitive hydrogel that the researchers designed...

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    Billions of Quantum Entangled Electrons found in ‘Strange Metal’

    January 17, 2020, Categories  Physics, Technology/Electronics

    Former Rice University graduate student Xinwei Li in 2016 with the terahertz spectrometer he later used to measure entanglement in the conduction electrons flowing through a “strange metal” compound of ytterbium, rhodium and silicon. (Photo by Jeff Fitlow/Rice University)

    In a new study, U.S. and Austrian physicists have observed quantum entanglement among “billions of billions” of flowing electrons in a quantum critical material.

    The research, which appears this week in Science, examined the electronic and magnetic behavior of a “strange metal” compound of ytterbium, rhodium and silicon as it both neared and passed through a critical transition at the boundary between two well-studied quantum phases.

    The study at Rice University and Vienna University of Technology (TU Wien...

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