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Keyword: photon

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  • A Photon Source That Operates at Ambient Temperatures on a Chip

    05/04/2016 7:52:34 AM PDT · by BenLurkin · 16 replies
    Quantum information science and technology has emerged as a new paradigm for dramatically faster computation and secure communication in the 21st century. At the heart of any quantum system is the most basic building block, the quantum bit or qbit, which carries the quantum information that can be transferred and processed (this is the quantum analogue of the bit used in current information systems). The most promising carrier qbit for ultimately fast, long distance quantum information transfer is the photon, the quantum unit of light. The challenge facing scientists is to produce artificial sources of photons for various quantum information...
  • 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...
  • Quantum mechanics flummoxes physicists again

    07/24/2010 5:35:11 PM PDT · by LibWhacker · 82 replies · 3+ views
    Nature ^ | 7/22/10 | Jon Cartwright
    A fresh take on a classic experiment makes no progress in unifying quantum mechanics and relativity. If you ever want to get your head around the riddle that is quantum mechanics, look no further than the double-slit experiment. This shows, with perfect simplicity, how just watching a wave or a particle can change its behaviour. The idea is so unpalatable to physicists that they have spent decades trying to find new ways to test it. The latest such attempt, by physicists in Europe and Canada, used a three-slit version — but quantum mechanics won out again. In the standard double-slit...
  • Thruster May Shorten Mars Trip (from six months to a week!)

    09/10/2007 11:31:01 AM PDT · by LibWhacker · 79 replies · 1,548+ views
    TUSTIN, Calif., Sept. 7, 2007 -- An amplified photon thruster that could potentially shorten the trip to Mars from six months to a week has reportedly attracted the attention of aerospace agencies and contractors. Young Bae, founder of the Bae Institute in Tustin, Calif., first demonstrated his photonic laser thruster (PLT), which he built with off-the-shelf components, in December. The demonstration produced a photon thrust of 35 µN and is scalable to achieve much greater thrust for future space missions, the institute said. Applications include highly precise satellite formation flying configurations for building large synthetic apertures in space for earth...
  • Theory of relativity....Any physicists out there?

    01/16/2005 2:53:56 AM PST · by plenipotentiary · 29 replies · 569+ views
    16 Jan 2005 | Your obedient servant
    Current theory is that nothing CAN travel faster than light (photons), and it is upon this that the theory of relativity rests. How about we change that definition to "nothing travels faster than light", ie that it is not impossible to exceed light speed, it is just that at the moment nothing does. Suppose a particle of light (photon) has some mass (otherwise it would not exist). Suppose we envisage a photon travelling at light speed. We are travelling in our turbocharged faster than light speed vehicle. We come up behind the photon and give it a little nudge. Does...
  • Astronomy Picture of the Day 9-14-02

    09/13/2002 10:08:15 PM PDT · by petuniasevan · 10 replies · 253+ views
    NASA ^ | 9-14-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 September 14 X-Ray Moon Credit: J. Schmitt et al., ROSAT Mission, MPE, ESA Explanation: This x-ray image of the Moon was made by the orbiting ROSAT (Röntgensatellit) Observatory in 1990. In this digital picture, pixel brightness corresponds to x-ray intensity. Consider the image in three parts: the bright hemisphere of the x-ray moon, the darker half of the moon, and the x-ray sky background. The bright lunar...