New York Times (blog) FCC Backs Plan to Update a Fund That Helps Connect Schools to the Internet New York Times (blog) WASHINGTON — The Federal Communications Commission voted on Friday to overhaul and possibly expand its E-Rate program, a $2.3...
When students engage in quality projects, they develop knowledge, skills, and dispositions that serve them in the moment and in the long term. Unfortunately, not all projects live up to their potential. Sometimes the problem lies in the design process. It’s easy to jump directly into planning the activities students will engage in without addressing important elements that will affect the overall quality of the project.
Lee Hosts THEC Mathematics Workshop For Local Teachers The Chattanoogan Lee University hosted the Mathematics in Biotechnology (MIB2.0) workshop, a five-day program held in Lee University's science and math complex.
The ability to store light while keeping its quantum coherence properties (e.g., entanglement) plays an important role in quantum information science. It makes it possible to build quantum memories for light, which could become crucial elements in many quantum information processing schemes based on the use of photons, from quantum communication networks to quantum computing protocols. A critical parameter for applications is the duration over which light can be stored. For example, the distribution of quantum bits over complex quantum information networks, and their storage for further manipulation, might require quantum memories with storage time from a few seconds to a few minutes. Writing inPhysical Review Letters, Georg Heinze at the University of Darmstadt, Germany, and colleagues report an important step towards this goal by demonstrating a solid-state coherent optical memory capable of storing a classical light pulse, and even a full image, for a duration of more than one minute—the longest light-storage time reported in any system to date.
To stop and retrieve light pulses without destroying their quantum coherence, light coherence needs to be converted into atomic coherences. This can be achieved with electromagnetically induced transparency (EIT), a quantum interference effect that makes an opaque medium transparent over a narrow spectral range. In EIT, a control laser beam excites atomic systems with two ground spin states connected to an excited state by optically allowed transitions. Through destructive interference, the transition probability between one of the ground states and the excited state (hence the absorption at the corresponding frequency) vanishes. The change of absorption results in a very steep change of refractive index that reduces the group velocity of an incoming light pulse. Light can be slowed down to the point that it comes to a halt: by switching off the control beam when the light is within the sample, the photons can be converted into collective atomic spin excitations (so called spin waves). The spin waves can be stored in the atoms for as long as the coherence between the two spin levels survives, before being converted back into light by turning on the control pulse again. The scheme thus allows the coherent storage and retrieval of light.
Jet Propulsion Laboratory NASA Advanced Technology Concepts Selected for Study Jet Propulsion Laboratory "NASA's Innovative Advanced Concepts Program invites innovators everywhere -- industry, academia, NASA centers, other agencies -- to propose...
Huffington Post Getting Kids Excited About Mathematics, One Festival at a Time Huffington Post I was a facilitator, and I'd come a long way---from Atlanta---for the privilege of spending four hours interacting with smart kids who were eager for...
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