Physicists Achieve Quantum Teleportation of Photon Over 25 Kilometers For the first time, a team of physicists have successfully teleported a quantum state of a photon to a crystal over 25 kilometers away through a fiber optic cable. This effectively showed that the photon’s quantum state, not its composition, is important to the teleportation process. The team was led by Nicolas Gisin of the University of Geneva and the results were published in the journal Nature Photonics. The quantum state of the photon is able to preserve information under extreme conditions, including the difference between traveling as light or becoming stored in the crystal like matter. To test this and ensure what they were observing was actually happening, one photon was stored in a crystal while the other was sent along optical fiber, over a distance of 25 kilometers. The photon did not physically “teleport” as we are used to hearing about in science fiction, where someone’s body can moved from place to place in a matter of seconds.
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RGB and CMYK color models The most common devices we use use in a modern household, such as a television, computer monitor, or any sort of device the emits light is typically engineered using the primary colors of light - red, green and blue. This is often why digital images or devices are referred to as RGB. This is a vast difference from the RYB model that most school children are introduced to. Which one is correct? The answer is that you could use either to mix colors, but some are easier to work with than others. When we look at the visible spectrum (as seen by the human eye) the colors appear red, orange, yellow, green, cyan, blue, magenta(violet). thanks to Gringer from Wikipedia 620-750 nm - red 590-620 nm - orange 570-590 nm - yellow 495-570 nm - green 450-495 nm - blue 380-450 nm - violet Every other color beginning with red comprises this traditional color mixing chart of red, yellow and blue. red - 130 nm orange - 30 nm yellow - 20 nm green - 75 nm blue - 45 nm violet - 70 nm previous next
Standing wave Two opposing waves combine to form a standing wave. For waves of equal amplitude traveling in opposing directions, there is on average no net propagation of energy. Moving medium As an example of the first type, under certain meteorological conditions standing waves form in the atmosphere in the lee of mountain ranges. Such waves are often exploited by glider pilots. Standing waves and hydraulic jumps also form on fast flowing river rapids and tidal currents such as the Saltstraumen maelstrom. Opposing waves In practice, losses in the transmission line and other components mean that a perfect reflection and a pure standing wave are never achieved. Another example is standing waves in the open ocean formed by waves with the same wave period moving in opposite directions. Mathematical description In one dimension, two waves with the same frequency, wavelength and amplitude traveling in opposite directions will interfere and produce a standing wave or stationary wave. and
New math and quantum mechanics: Fluid mechanics suggests alternative to quantum orthodoxy -- ScienceDaily The central mystery of quantum mechanics is that small chunks of matter sometimes seem to behave like particles, sometimes like waves. For most of the past century, the prevailing explanation of this conundrum has been what's called the "Copenhagen interpretation" -- which holds that, in some sense, a single particle really is a wave, smeared out across the universe, that collapses into a determinate location only when observed. But some founders of quantum physics -- notably Louis de Broglie -- championed an alternative interpretation, known as "pilot-wave theory," which posits that quantum particles are borne along on some type of wave. According to pilot-wave theory, the particles have definite trajectories, but because of the pilot wave's influence, they still exhibit wavelike statistics. John Bush, a professor of applied mathematics at MIT, believes that pilot-wave theory deserves a second look. Tracking trajectories The fluidic pilot-wave system is also chaotic. What's real?
Light waves, visible and invisible - Lucianne Walkowicz Can we accurately describe light as exclusively a wave or just a particle? Are the two mutually exclusive? In this third part of his series on light and color, Colm Kelleher discusses wave-particle duality and its relationship to how we see light and, therefore, color. A look at sustainable energy and what we use our energy for. How many lightbulbs? There are three types of color receptors in your eye: red, green and blue. Have you ever wondered what color is? Why do we see those stunning lights in the northern- and southernmost portions of the night sky?
Twisted light beats quantum light The cool thing about science is that, even in the areas that you think you are pretty knowledgeable, surprises abound. This is what keeps me turning up to work (occasionally) and (even more occasionally) committing the crime of science writing. In this case, I get to combine a work interest (using light to measure stuff) with one of last century's passing fads (light with orbital angular momentum). I'm being a little unfair to the community of researchers who play with twisted light. In many types of optical measurements, we rely on the accurate alignment of two coordinate systems. Polarization is a measurement that tells us about the spatial orientation of the electromagnetic field of the light and how it evolves in time. When we measure polarization, however, we use apparatuses that measure the intensity of light after it has been filtered at a specific orientation. For a very precise measurement, we will want the two filters aligned as perfectly as possible. Light that is... twisted
Capping decades of searching, Princeton scientists observe elusive particle that is its own antiparticle Posted October 2, 2014; 04:00 p.m. by Steven Schultz, Office of Engineering Communications Princeton University scientists have observed an exotic particle that behaves simultaneously like matter and antimatter, a feat of math and engineering that could eventually enable powerful computers based on quantum mechanics. Using a two-story-tall microscope floating in an ultralow-vibration lab at Princeton's Jadwin Hall, the scientists captured a glowing image of a particle known as a "Majorana fermion" perched at the end of an atomically thin wire — just where it had been predicted to be after decades of study and calculation dating back to the 1930s. "This is the most direct way of looking for the Majorana fermion since it is expected to emerge at the edge of certain materials," said Ali Yazdani, a professor of physics who led the research team. "If you want to find this particle within a material you have to use such a microscope, which allows you to see where it actually is." Back To Top
Tacoma Narrows Bridge Collapse (Sound Version) (Standard 4:3) : Stillman Fires Collection; Tacoma Fire Department (Video) - Castle Films (Sound) In November, 1940, the newly completed Tacoma Narrows Bridge, opened barely four months before, swayed and collapsed in a 42 mile-per-hour wind. There were no casualties except a dog trapped in a car stranded on the bridge. A rescue was attempted (by the man with the pipe), but the frightened animal would not leave the car. The site was declared a National Historic Landmark to discourage relic seekers and salvage operations. This file is a composite of the good quality Internet Archive file and the soundtrack of a poor quality (heavily scratched and filled with abrasions) Castle Film entitled "The Movies Greatest Headlines," which is also in the public domain. I've edited the video to make it fit the sound. Run time 2:35Producer Stillman Fires Collection; Tacoma Fire Department (Video) - Castle Films (Sound)Audio/Visual sound, black and white Reviewer:The_Emperor_Of_Television - favoritefavoritefavoritefavorite - July 26, 2010 Subject: Good footage
Les ondes hyperfréquences Q u'est-ce qu'une onde électromagnétique ? C'est la propagation, à la vitesse de la lumière, d'une déformation harmonique des propriétés électriques et magnétiques de l'espace. L'amplitude de cette déformation est ce que l'on appelle la longueur d'onde. On définit également une onde par sa fréquence, c'est-à-dire le rapport entre sa vitesse et sa longueur d'onde. La figure I-1 décrit les différentes radiations du spectre électromagnétique. Intéressons nous plus en détail au domaine qui nous concerne, celui qui se situe à cheval entre les ondes radio et l'infrarouge : le domaine micro-onde. A ces trois domaines, sont bien sûr associées deux frontières qui, loin d'être des ruptures, sont de larges zones de recouvrement. Les différentes sources de génération d'ondes électromagnétiques sont illustrées sur la figure I-1 . Un découpage plus précis du domaine hyperfréquence a été réalisé : ce sont les bandes IEEE ( ) données par le tableau I-1 . Bande L Bande S Bande C Bande X Bande Ku Bande K
From E=mc² to the atomic bomb When Einstein's most famous formula E=mc2 is mentioned, the atomic bomb is usually not far behind. Indeed there is a connection between the two, but it is subtle, and sadly, some popular science texts get it wrong: they will tell you that a nuclear explosion is "caused by the transformation of matter and energy" according to Einstein's formula, and that the gigantic conversion factor c2 is responsible for the immense power of such weapons. Ten seconds after the ignition of the first atomic bomb, New Mexico, July 16, 1945[Image: Los Alamos National Laboratory] But first things first. Equivalence or transformation? For Einstein, mass (more precisely: relativistic mass; the property that determines how difficult it is to change a body's speed or its direction of motion) and energy are simply two different names for one and the same physical quantity. The context in which "transformation of mass into energy" does make sense is a bit different. A new kind of energy Not at all.