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
Scientists discover particles similar to Majorana fermions
25.10.2016 | Chinese Academy of Sciences Headquarters
Light-driven atomic rotations excite magnetic waves
24.10.2016 | Max-Planck-Institut für Struktur und Dynamik der Materie
Ultrafast lasers have introduced new possibilities in engraving ultrafine structures, and scientists are now also investigating how to use them to etch microstructures into thin glass. There are possible applications in analytics (lab on a chip) and especially in electronics and the consumer sector, where great interest has been shown.
This new method was born of a surprising phenomenon: irradiating glass in a particular way with an ultrafast laser has the effect of making the glass up to a...
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
25.10.2016 | Earth Sciences
25.10.2016 | Power and Electrical Engineering
25.10.2016 | Process Engineering