Latest Quantum entanglement Stories

2010-11-18 17:16:36

Heisenberg Uncertainty Principle sets limits on Einstein's 'spooky action at a distance,' new research finds Researchers have uncovered a fundamental link between the two defining properties of quantum physics. Stephanie Wehner of Singapore's Centre for Quantum Technologies and the National University of Singapore and Jonathan Oppenheim of the United Kingdom's University of Cambridge published their work today in the latest edition of the journal Science. The result is being heralded as a...

2010-11-17 22:07:39

Researchers at the California Institute of Technology (Caltech) have demonstrated quantum entanglement for a quantum state stored in four spatially distinct atomic memories. Their work, described in the November 18 issue of the journal Nature, also demonstrated a quantum interface between the atomic memories"”which represent something akin to a computer "hard drive" for entanglement"”and four beams of light, thereby enabling the four-fold entanglement to be distributed by photons...

2010-11-08 10:39:19

Researchers from the Niels Bohr Institute at the University of Copenhagen have succeeded in storing quantum information using two 'entangled' light beams. Quantum memory or information storage is a necessary element of future quantum communication networks. The new findings are published in Nature Physics. Quantum networks will be able to protect the security of information better than the current conventional communication networks. The cornerstone of quantum communication is a phenomenon...

2010-10-20 00:49:48

Critical component of quantum communication device may enable cryptography When the military needs to send the key to encrypted data across the world, it can't necessarily rely on today's communication lines, where the message could be covertly intercepted. But physicists at the Georgia Institute of Technology in Atlanta are developing a new, more secure way to send such information across far distances, using existing cables and the laws of quantum mechanics. Alex Kuzmich and colleagues have...

2010-09-27 12:08:56

Entanglement is a fascinating property connecting quantum systems. Albert Einstein called it the "spooky action at a distance". This bizarre coupling can link particles, even if they are located on opposite sides of the galaxy. The strength of their connections is behind the promising quantum computers, the dream machines capable of quick and efficient computations. The team lead by Rainer Blatt at the Institute of Experimental Physics of the University of Innsbruck has been working very...

2010-07-27 15:39:09

Uncertainty in the presence of a quantum memory A quantum particle is hard to grasp, because one cannot determine all its properties precisely at the same time. Measurements of certain parameter pairs such as position and momentum remain inaccurate to a degree given by Heisenberg's Uncertainty Principle. This is important for the security of quantum cryptography, where information is transmitted in the form of quantum states such as the polarization of particles of light. A group of...

2010-07-22 01:52:23

Recently, academic debate has been swirling around the existence of unusual quantum mechanical effects in the most ubiquitous of phenomena, including photosynthesis, the process by which organisms convert light into chemical energy. In particular, physicists have suggested that entanglement (the quantum interconnection of two or more objects like photons, electrons, or atoms that are separated in physical space) could be occurring in the photosynthetic complexes of plants, particularly in the...

2010-06-03 07:54:10

For most people, frustration is a condition to be avoided. But for scientists studying certain "frustrated" ensembles of interacting components "“ that is, those which cannot settle into a state that minimizes each interaction "“ it may be the key to understanding a host of puzzling phenomena that affect systems from neural networks and social structures to protein folding and magnetism. Frustration has typically been extremely difficult to study because even systems with...

2010-04-14 14:34:23

Researchers have devised a new kind of random number generator, for encrypted communications and other uses, that is cryptographically secure, inherently private and "“ most importantly "“ certified random by laws of physics. That is important because randomness is surprisingly rare. Although the welter of events that transpire in the course of daily life can certainly seem haphazard and arbitrary, none of them is genuinely random in the sense that they could not be predicted...

2010-02-15 07:51:02

University of Calgary researchers use quantum entanglement to stack light particles While many of us enjoyed constructing little houses out of toy bricks when we were kids, this task is much more difficult if bricks are elementary particles. It is even harder if these are particles of light "“ photons, which can only exist while flying at an incredible speed and vanish if they touch anything. A team at the University of Calgary has accomplished exactly that: by manipulating a mysterious...

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