One of the most promising technologies for future quantum circuits are photonic circuits, i.e. circuits based on light (photons) instead of electrons (electronic circuits). First, it is necessary to create a stream of single photons and control their direction. Researchers have now succeeded in creating a steady stream of photons emitted one at a time and in a particular direction.
The rise of the Tibetan plateau -- the largest topographic anomaly above sea level on Earth -- is important for both its profound effect on climate and its reflection of continental dynamics. Scientists have now employed a cutting-edge geochemical tool -- "clumped" isotope thermometry -- using modern and fossil snail shells to investigate the uplift history of the Zhada basin in southwestern Tibet.
A new DNA study unravels the settlement history of the New World Arctic. We know people have lived in the New World Arctic for about 5,000 years. Archaeological evidence clearly shows that a variety of cultures survived the harsh climate in Alaska, Canada and Greenland for thousands of years. Despite this, there are several unanswered questions about these people.
Racetrack Playa is home to an enduring Death Valley mystery. Littered across the surface of this dry lake, also called a "playa," are hundreds of rocks -- some weighing as much as 320 kilograms (700 pounds) -- that seem to have been dragged across the ground, leaving synchronized trails that can stretch for hundreds of meters.
A new study reports that an expansion of marine protected areas is needed to protect fish species that perform key ecological functions. According to investigators, previous efforts at protecting fish have focused on saving the largest numbers of species, often at the expense of those species that provide key and difficult-to-replace ecological functions.
An international team of scientists has developed a tunable spin-charge converter made of GaAs. Spin-charge converters are important devices in spintronics, an electronic which is not only based on the charge of electrons but also on their spin and the spin-related magnetism. Spin-charge converters enable the transformation of electric into magnetic signals and vice versa.
Wally Broeker, the first person to alert the world to global warming, has called for atmospheric carbon dioxide to be captured and stored underground.
In the course of ongoing excavations at Timna Valley, archaeologists analyzed remnants of food eaten by copper smelters 3,000 years ago. This analysis indicates that the laborers operating the furnaces were in fact skilled craftsmen who enjoyed high social status and adulation. They believe their discovery may have ramifications for similar sites across the region.
Researchers have developed a fundamentally new quantum imaging technique with strikingly counter-intuitive features. For the first time, an image has been obtained without ever detecting the light that was used to illuminate the imaged object, while the light revealing the image never touches the imaged object.
Researchers have created a ‘large-scale zoning plan’ that aims to limit the environmental costs of road expansion while maximizing its benefits for human development.