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Photon

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New dimensions of quantum information added through hyperentanglement

By - July 1, 2015 1 Picture

In quantum cryptography, encoding entangled photons with particular spin states is a technique that ensures data transmitted over fiber networks arrives at its destination without being intercepted or changed. However, as each entangled pair is usually only capable of being encoded with one state (generally the direction of its polarization), the amount of data carried is limited to just one quantum bit per photon. To address this limitation, researchers have now devised a way to "hyperentangle" photons that they say can increase the amount of data carried by a photon pair by as much as 32 times.

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Image captures light as both wave and particle for very first time

By - March 2, 2015 1 Picture
In 1905, Albert Einstein provided an explanation of the photoelectric effect – that various metals emit electrons when light is shined on them – by suggesting that a beam of light is not simply a wave of electromagnetic radiation, but is also made up of discrete packets of energy called photons. Though a long accepted tenet in physics, no experiment has ever directly observed this wave/particle duality. Now, however, researchers at the École polytechnique fédérale de Lausanne (EPFL) in Switzerland claim to have captured an image of this phenomenon for the first time ever. Read More
— Science

Researchers achieve long-distance light to matter quantum teleportation

By - September 22, 2014 1 Picture
A successful test in passing information from light into matter – using the teleportation of the quantum state of a photon via optical fiber cable to a receiving crystal located over 25 km (15 mi) away – has been claimed by physicists at the University of Geneva. This test shattered the same team’s previous record and may herald the development of greater, long-distance teleportation techniques and qubit communications and computing capabilities. Read More
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New photonic molecules are not unlike lightsabers

By - November 26, 2013 2 Pictures
Scientists from Harvard and MIT have jointly demonstrated that, in specific conditions, photons can be made to interact with each other and form molecules. Such groupings of photons, dubbed “Photonic molecules”, constitute an entirely new form of matter, which until recently was purely theoretical. Combining the properties of light and those of solids, in terms of physics this new form of matter is not unlike a certain material that millions of Star Wars fans are already well familiar with. Lightsaber material. Read More
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Quantum "spooky action at a distance" travels at least 10,000 times faster than light

By - March 10, 2013 4 Pictures
Quantum entanglement, one of the odder aspects of quantum theory, links the properties of particles even when they are separated by large distances. When a property of one of a pair of entangled particles is measured, the other "immediately" settles down into a state compatible with that measurement. So how fast is "immediately"? According to research by Prof. Juan Yin and colleagues at the University of Science and Technology of China in Shanghai, the lower limit to the speed associated with entanglement dynamics – or "spooky action at a distance" – is at least 10,000 times faster than light. Read More
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Stanford researchers control light using synthetic magnetism

By - December 4, 2012 2 Pictures
Left to its own ways, light will follow the same path through an optical system whether the system is being used as a camera lens or as a projector. This is called time-reversal symmetry, or reciprocity. As many new applications and methods would be enabled by access to a non-reciprocal optical system, it is unfortunate that they have been so difficult to come by. But now researchers at Stanford University have discovered how to make such non-reciprocal systems by generating an effective magnetic field for photons. Read More
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Australian researchers amplify quantum information using teleportation

By - November 27, 2012 1 Picture
The establishment of a worldwide quantum internet would provide individuals, businesses, organizations, and governments access to intrinsically secure communications. However, absorption of photons in transit between internet nodes can dramatically reduce the efficiency of such a quantum internet. Now a research group at Australia's (CQCCT) has invented a way to recover some of the lost quantum information by teleporting the original information to another photon. Read More
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Faster-than-light travel observed ... of neutrinos, maybe

By - September 23, 2011 1 Picture
According to Einstein’s restricted theory of relativity, nothing can travel faster than light in a vacuum. Up until today, that had pretty much seemed to be the case, too. Early this morning, however, researchers from the Geneva-based OPERA project announced that the results from one of their recent experiments indicate that neutrinos can in fact outrun light particles. Read More
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