42 results

[ News ] Generating entangled photons by linking LEDs and superconductors

March 31, 2014

A magnet levitating above a high-temperature superconductor, cooled with liquid nitrogen (credit: Wikimedia Commons)

A team of University of Toronto physicists led by Alex Hayat has proposed a novel and efficient way to leverage quantum entanglement: combining light-emitting diodes (LEDs) with a superconductor to generate entangled photons.

The method could open up a rich spectrum of new physics as well as devices for quantum technologies, including quantum computers and quantum communication, the researchers suggest.

“A usual light source… read more

[ News ] A record quantum entanglement: 103 dimensions

March 31, 2014

multi-dimensional-entanglement

An international team of researchers has created an entanglement of 103 dimensions with only two photons, beating the previous record of 11 dimensions.

The discovery could represent an advance toward toward better encryption of information and quantum computers with much higher processing speeds, according to a statement by the researchers.

Until now, to increase the “computing” capacity of these particle systems, scientists have mainly turned to increasing the number… read more

[ News ] Quantum engineers make a major step towards a scalable quantum computer

February 3, 2014

(Credit: Nature)

Scientists and engineers from an international collaboration led by Mark Thompson from the University of Bristol have, for the first time, generated and manipulated single photons on a silicon chip — a major step forward in the race to build a quantum computer, achieved by shrinking down key components and integrating them onto a silicon microchip, according to the researchers.

Previous attempts have required external… read more

[ News ] What if quantum entanglement worked on the macroscopic level?

July 26, 2013

entangled photons

Quantum entanglement works for photons, and even molecuiles, but what about larger objects?

University of Geneva (UNIGE) researchers managed to entangle crystals in 2011, but now they have entangled two optic fibers, populated by 500 photons.

To do this, the team first created an entanglement between two fiber optics on a microscopic level before moving it to the macroscopic level. The entangled state survived… read more

[ News ] A quantum computing solution for unstructured search

June 26, 2013

Bose-Einstein condensate

Tom Wong, a graduate student in physics and David Meyer, professor of mathematics at the University of California, San Diego, have proposed a new algorithm for quantum computing, that will speed up unstructured search.

The goal is to locate a particular item within an unsorted pile of data. Solving this problem on a classical computer, which uses 1s and 0s stored on magnetic media, is… read more

[ News ] ‘Spooky action at a distance’ to be tested aboard the ISS

April 11, 2013

International Space Station (credit: NASA)

Researchers at the Institute for Quantum Optics and Quantum Information in Austria and the European Space Agency have proposed using the International Space Station (ISS) to test the limits of “spooky action at a distance” (remote quantum entanglement) and potentially help to develop the first global quantum communication network.

Albert Einstein famously described quantum entanglement as “spooky action at distance”; however, up until now, experiments… read more

[ News ] MIT researchers discover a new kind of magnetism

December 21, 2012

MIT physicists grew this pure crystal of herbertsmithite in their laboratory. This sample, which took 10 months to grow, is 7 mm long (just over a quarter-inch) and weighs 0.2 grams. (Credit: Tianheng Han/MIT)

MIT researchers have demonstrated experimentally the existence of a fundamentally new kind of magnetic behavior called a quantum spin liquid (QSL),adding to the two previously known states of magnetism.

Ferromagnetism — the simple magnetism of a bar magnet or compass needle — has been known for centuries. In a second type of magnetism, antiferromagnetism, the magnetic fields of the ions within a metal or alloy cancel… read more

[ News ] How to build a million-qubit quantum computer

December 4, 2012

Hybrid dual-quantum dot/superconducting resonator device

A team led by Princeton‘s Associate Professor of Physics Jason Petta has developed a new method that could eventually allow engineers to build a working quantum computer consisting of millions of quantum bits (qubits).

Quantum computers take advantage of the strange behaviors of subatomic particles like electrons. By harnessing electrons as they spin, scientists could use the particles to form the basis for a… read more

[ News ] Massive but fast electrons may allow for superconductivity

June 15, 2012

massive_electrons_moving_in_solids

A Princeton University-led team of scientists has shown how electrons moving in certain solids can behave as though they are a thousand times more massive than free electrons, yet at the same time act as speedy superconductors.

The observation of these seemingly contradictory electron properties is critical to the understanding of how certain materials become superconducting, in which electrons can flow without resistance. Such materials… read more

[ News ] Austrian researchers set new world distance record for ‘quantum teleportation’

May 21, 2012

La_palma_to_tenerife

Anton Zeilinger’s group (Institute for Quantum Optics and Quantum Information at the University of Vienna) has just submitted an arXiv paper claiming that they’ve demonstratedquantum teleportation“ over a distance of 143 km (89 miles) in the Canary Islands. If confirmed, this sets a new world’s distance record in quantum teleportation, and also sets the stage for a future global quantum network for secure satellite communications.… read more

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