Keyword: photons

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  • Spooky Quantum Entanglement Gets Extra 'Twist'

    11/07/2012 5:25:07 PM PST · by BenLurkin · 22 replies
    LiveScience ^ | Date: 06 November 2012 Time: 10:02 AM ET | Jesse Emspak, Contributor
    Now physicists at the University of Vienna in Austria have "virtually intertwined" or entangled two particles spinning faster than ever in opposite directions. Entanglement occurs when two particles remain connected so that actions performed on one affect the other, despite the distance between them. (Einstein referred to this eerie connection as "spooky action at a distance.") In the new study, Anton Fickler and his colleagues entangled two photons that had a high orbital angular momentum, a property that measures the twisting of a wave of light. In quantum physics, particles such as photons can behave as particles and waves. Such...
  • Will Space Battles Be Fought with Laser Weapons?

    03/22/2012 1:34:51 AM PDT · by U-238 · 33 replies · 2+ views
    Life's Little Mysteries ^ | 3/16/2012 | Adam Hadhazy
    What would science fiction be without laser beams? From handheld ray guns to spaceship-mounted turbolasers, the futuristic weapon of choice definitely involves bright, colorful blasts of energy. In the early 21st century, projectiles still remain the standard means of inflicting damage from a distance. Yet continued research into "directed-energy" weapons by the United States military, among others, could someday bring lasers to a battlefield near you. Lasers are already used in guidance, targeting and communication applications, but significant technological obstacles stand in front of turning them into weapons by themselves. For certain niche scenarios, lasers might prove themselves ideal. It...
  • Putting Photons to Work

    05/18/2009 1:13:20 AM PDT · by neverdem · 19 replies · 1,171+ views
    ScienceNOW Daily News ^ | 15 May 2009 | Phil Berardelli
    Enlarge ImageNano vibrator. A tiny device called a zipper cavity can convert laser light into mechanical energy. Credit: Matt Eichenfield and Jasper Chan, Nature Researchers have built a nanoscale device that vibrates when struck by incoming laser light. The contraption, which is sensitive to the energy of a single photon, could speed the development of new optical communications systems. It could also help scientists probe some of the fundamental properties of matter with greater precision. Light beams might not seem capable of performing mechanical work (photons, the carriers of light waves, have no mass), but at the atomic level...
  • 'Spooky Action At A Distance' Of Quantum Mechanics Directly Observed

    03/11/2009 8:20:34 PM PDT · by grey_whiskers · 48 replies · 1,450+ views
    Science Daily ^ | March 4, 2009 | staff
    ScienceDaily (Mar. 4, 2009) — In quantum mechanics, a vanguard of physics where science often merges into philosophy, much of our understanding is based on conjecture and probabilities, but a group of researchers in Japan has moved one of the fundamental paradoxes in quantum mechanics into the lab for experimentation and observed some of the 'spooky action at a distance' of quantum mechanics directly, Hardy's Paradox, the axiom that we cannot make inferences about past events that haven't been directly observed while also acknowledging that the very act of observation affects the reality we seek to unearth, poses a conundrum...
  • “The Photon Force is with us”: Harnessing Light to Drive Nanomachines

    11/27/2008 7:29:03 PM PST · by neverdem · 8 replies · 703+ views
    Yale ^ | November 26, 2008 | NA
    Photonic circuit in which optical force is harnessed to drive nanomechanics. New Haven, Conn. — Science fiction writers have long envisioned sailing a spacecraft by the optical force of the sun’s light. But, the forces of sunlight are too weak to fill even the oversized sails that have been tried. Now a team led by researchers at the Yale School of Engineering & Applied Science has shown that the force of light indeed can be harnessed to drive machines — when the process is scaled to nano-proportions. Their work opens the door to a new class of semiconductor devices that...
  • High Energy Gamma Rays Go Slower Than the Speed of Light?

    10/04/2007 9:33:31 PM PDT · by annie laurie · 12 replies · 1,172+ views
    Universe Today ^ | October 3rd, 2007 | Fraser Cain
    The speed of light is the speed of light, and that's that. Right? Well, maybe not. Try and figure this out. Astronomers studying radiation coming from a distant galaxy found that the high energy gamma rays arrived a few minutes after the lower-energy photons, even though they were emitted at the same time. If true, this result would overturn Einstein's theory of relativity, which says that all photons should move at the speed of light. Uh oh Einstein. The discovery was made using the new MAGIC (Major Atmospheric Gamma-ray Imaging Cherenkov) telescope, located on a mountain top on the Canary...
  • Scientists teleport two different objects

    10/04/2006 7:11:24 PM PDT · by TampaDude · 36 replies · 1,592+ views
    CNN.com ^ | 10/04/2006 | Reuters
    LONDON, England (Reuters) -- Beaming people in Star Trek fashion is still in the realms of science fiction but physicists in Denmark have teleported information from light to matter bringing quantum communication and computing closer to reality. Until now scientists have teleported similar objects such as light or single atoms over short distances from one spot to another in a split second. But Professor Eugene Polzik and his team at the Niels Bohr Institute at Copenhagen University in Denmark have made a breakthrough by using both light and matter. "It is one step further because for the first time it...
  • On the Effectiveness of Aluminium Foil Helmets:

    06/05/2006 8:14:08 PM PDT · by Attention Surplus Disorder · 54 replies · 1,242+ views
    Electrical Engineering and Computer Science department, MIT. ^ | February 17, 2005 | Ali Rahimi1, Recht 2, Taylor 2, Vawter
    Abstract: Among a fringe community of paranoids, aluminum helmets serve as the protective measure of choice against invasive radio signals. We investigate the efficacy of three aluminum helmet designs on a sample group of four individuals. Using a $250,000 network analyser, we find that although on average all helmets attenuate invasive radio frequencies in either directions (either emanating from an outside source, or emanating from the cranium of the subject), certain frequencies are in fact greatly amplified. These amplified frequencies coincide with radio bands reserved for government use according to the Federal Communication Commission (FCC). Statistical evidence suggests the use...