In quantum information processing, data is manipulated using ‘qubits’ – quantum bits. Single electrons make excellent qubits, but interactions with other electrons mean that useable quantum properties are rapidly lost.
The new results are important because they demonstrate explicitly, that in a practical material, a large number of electron spins can be coupled together to yield a quantum state covering around 100 atoms and extending over a distance of 30 nanometres (billionths of a metre). Only a few other examples of such quantum states are known and these lead to fascinating properties such as superconductivity and superfluidity.
"The unique capabilities of neutron scattering have made these latest observations possible," said Dr Christopher Frost, Instrument Scientist for the MAPS spectrometer at ISIS, and a co-author on the Science paper. "By analysing the images from the instrument, we can establish the perfection of the quantum state.” MAPS is a revolutionary instrument for neutron scattering at ISIS. Using neutron spectroscopy, an intense beam of neutrons is scattered from samples of research material and collected by 100 million detector pixels located over an area of 16 square metres giving a unique view into the interior world of atoms.
The team also discovered that they could manipulate the quantum state, limiting its phase coherence or making it disappear altogether, by introducing defects into the material either by adding chemical impurities or heating.
“Our goal is to understand the factors that affect the distance over which the quantum phase coherence can be maintained and neutron scattering is probably the most direct tool for studying this,” says lead author Guangyong Xu from Brookhaven National Laboratory, USA. “In quantum computing, this state must be must be maintained over a relatively long time in order to store information in the computer. This distance — and how sensitive it is to changes in temperature or chemical impurities in the material — can be essential in determining whether a material will have useful applications.”
Natalie Bealing | alfa
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20.10.2017 | NASA/Goddard Space Flight Center
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19.10.2017 | California Institute of Technology
University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
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Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
17.10.2017 | Event News
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