Latest Photon Stories

2011-12-12 13:24:20

The fundamental resource that drives a quantum computer is entanglement–the connection between two distant particles which Einstein famously called 'spooky action at a distance'. The Bristol researchers have, for the first time, shown that this remarkable phenomenon can be generated, manipulated and measured entirely on a tiny silica chip. They have also used the same chip to measure mixture–an often unwanted effect from the environment, but a phenomenon which can now be...

2011-12-09 11:47:27

'Dressing' atoms with laser light allows high angular momentum scattering to be seen for the first time in long-lived atomic Bose-Einstein condensates at ultracold temperatures Scientists at the Joint Quantum Institute (JQI) have for the first time engineered and detected the presence of high angular momentum collisions between atoms at temperatures close to absolute zero. Previous experiments with ultracold atoms featured essentially head-on collisions. The JQI experiment, by contrast, is...

2011-12-02 12:59:09

Scientists and engineers have proven the worth of quantum cryptography in telecommunication networks by demonstrating its long-term effectiveness in a real-time network. Their international network, created in collaboration with ID Quantique and installed in the Geneva metropolitan area and crossing over to the site of CERN in France, ran for more than one-and-a-half years from the end of March 2009 to the beginning of January 2011. Published today, 2 December, in the Institute of...

2011-11-21 12:37:42

News from the American Physical Society Hydrodynamics of writing with ink Jungchul Kim, Myoung-Woon Moon, Kwang-Ryeol Lee, L. Mahadevan, and Ho-Young Kim Physical Review Letters (forthcoming) For millennia, writing has been the preferred way to convey information and knowledge from one generation to another. We first developed the ability to write on clay tablets with a point, and then settled on a reed pen, as preserved from 3000 BC in Egypt when it was used with papyrus. This...

Creating Light From A Vacuum
2011-11-19 05:05:04

Scientists at Chalmers have succeeded in creating light from vacuum — observing an effect first predicted over 40 years ago. The results have been published in the journal Nature. In an innovative experiment, the scientists have managed to capture some of the photons that are constantly appearing and disappearing in the vacuum. The experiment is based on one of the most counterintuitive, yet, one of the most important principles in quantum mechanics: that vacuum is by no means empty...

Daily Pinpricks Could Be Replaced By Spectroscopy
2011-10-25 09:08:11

Part of managing diabetes involves piercing a finger several times daily to monitor blood sugar levels. Raman spectroscopy could let diabetics monitor glucose without those daily pinpricks. In the past, this would have required a tabletop's worth of equipment. Two former graduate students at MIT's George R. Harrison Spectroscopy Laboratory, Chae-Ryon Kong and Ishan Barman, detail in the AIP's journal AIP Advances how to potentially reduce the overall size of this sensor by making an important...

Image 1 - Diamonds, Silver And The Quest For Single Photons
2011-10-18 07:56:59

Tiny crystal towers enlighten understanding of photon emission, could inspire diamond microchips for quantum computing Building on earlier work showing how nanowires carved in impurity-laden diamond crystal can efficiently emit individual photons, researchers have developed a scalable manufacturing process to craft arrays of miniature, silver-plated-diamond posts that enable even greater photon control. The development supports efforts to create robust, room-temperature quantum...

2011-10-12 10:07:04

Physicists establish dynamic Jahn-Teller effect in defective diamonds A University at Buffalo-led research team has established the presence of a dynamic Jahn-Teller effect in defective diamonds, a finding that will help advance the development of diamond-based systems in applications such as quantum information processing. "We normally want things to be perfect, but defects are actually very important in terms of electronic applications," said Peihong Zhang, the UB associate professor...

Image 1 - Progress Being Made In Quantum Computing, Qubit By Qubit
2011-10-11 08:25:16

Researchers control the rate of photon emission from luminescent imperfections in diamond Engineers and physicists at Harvard have managed to capture light in tiny diamond pillars embedded in silver, releasing a stream of single photons at a controllable rate. The advance represents a milestone on the road to quantum networks in which information can be encoded in spins of electrons and carried through a network via light, one photon at a time. The finding was published in Nature...

Latest Photon Reference Libraries

2004-10-19 04:45:41

Electromagnetic Spectrum -- The electromagnetic spectrum describes the various types of electromagnetic radiation based on their wavelengths. Radio, representing wavelengths from a few feet to well over a mile, is at one end of the spectrum. Gamma ray radiation is at the other end: the wavelength of the harder types is so short, in the subatomic range, that we do not have instruments capable of directly measuring it. While the above classification scheme is generally accurate, in...

2004-10-19 04:45:41

Electromagnetic Radiation -- Electromagnetic radiation is a combination of oscillating electric and magnetic fields propagating through space and carrying energy from one place to another. Light is a form of electromagnetic radiation. The theoretical study of electromagnetic radiation is called electrodynamics, a subfield of electromagnetism. When any wire (or other conducting object such as an antenna) conducts alternating current, electromagnetic radiation is propagated at the same...

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Word of the Day
  • The hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed.
This word comes from the Greek 'endon,' in, within, plus the Greek 'kardia,' heart.