Archive for the ‘quantum physics’ category: Page 676

Jun 30, 2014

Have We Been Interpreting Quantum Mechanics Wrong This Whole Time?

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By Natalie Wolchover, Quanta Magazine

A droplet bouncing on the surface of a liquid has been found to exhibit many quantum-like properties, including double-slit interference, tunneling and energy quantization.

For nearly a century, “reality” has been a murky concept. The laws of quantum physics seem to suggest that particles spend much of their time in a ghostly state, lacking even basic properties such as a definite location and instead existing everywhere and nowhere at once. Only when a particle is measured does it suddenly materialize, appearing to pick its position as if by a roll of the dice.

This idea that nature is inherently probabilistic — that particles have no hard properties, only likelihoods, until they are observed — is directly implied by the standard equations of quantum mechanics. But now a set of surprising experiments with fluids has revived old skepticism about that worldview. The bizarre results are fueling interest in an almost forgotten version of quantum mechanics, one that never gave up the idea of a single, concrete reality.

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May 31, 2014

Physicists use diamonds to reach quantum teleportation breakthrough

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BY Philip Palermo — Endgadget

Quantum teleportation promises a leap into the next great era of computing — but first we’ve got to get it working consistently. Scientists at the Kavli Institute of Nanoscience Delft say they’ve managed to reliably teleport quantum info stored in one bit of diamond to another sitting three meters away (roughly 10 feet). Now, they want to go much farther.

The key with quantum teleportation is its ability to move quantum information (called a qubit) from one point to another without that information crossing the space between those two points. That’s thanks to a phenomenon known as quantum entanglement, where the properties of a pair of particles are linked so tightly that they remain connected regardless of distance. In a research article published today in Science, the team described how they used quantum-entangled particles to consistently transmit data from one nitrogen-infused bit of diamond to another.

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