Authors: George Rajna
Invisible to the human eye, terahertz electromagnetic waves can "see through" everything from fog and clouds to wood and masonry—an attribute that holds great promise for astrophysics research, detecting concealed explosives and many other applications.  "The lasers that we produce are a far cry from ordinary laser pointers ," explains Rolf Szedlak from the Institute of Solid State Electronics at TU Wien. "We make what are known as quantum cascade lasers. They are made up of a sophisticated layered system of different materials and emit light in the infrared range."  Researchers at ETH Zurich have discovered a peculiar feature in oscillations similar to that of a child's swing. As a result, they have succeeded in outlining a novel principle for small, high-resolution sensors, and have submitted a patent application for it.  A collaboration including researchers at the National Physical Laboratory (NPL) has developed a tuneable, high-efficiency, single-photon microwave source. The technology has great potential for applications in quantum computing and quantum information technology, as well as in studying the fundamental reactions between light and matter in quantum circuits.  Researchers from MIT and MIT Lincoln Laboratory report an important step toward practical quantum computers, with a paper describing a prototype chip that can trap ions in an electric field and, with built-in optics, direct laser light toward each of them.  An ion trap with four segmented blade electrodes used to trap a linear chain of atomic ions for quantum information processing. Each ion is addressed optically for individual control and readout using the high optical access of the trap.  To date, researchers have realised qubits in the form of individual electrons (aktuell.ruhr-uni-bochum.de/pm2012/pm00090.html.en). However, this led to interferences and rendered the information carriers difficult to programme and read. The group has solved this problem by utilising electron holes as qubits, rather than electrons.  Physicists from MIPT and the Russian Quantum Center have developed an easier method to create a universal quantum computer using multilevel quantum systems (qudits), each one of which is able to work with multiple "conventional" quantum elements – qubits. 
Comments: 33 Pages.
[v1] 2016-11-15 13:38:29
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