New work by two researchers at HP Laboratories Bristol sets out to solve one of the major difficulties in quantum computer architectures that use directly interacting qubits.
The problem is that the million-or-so qubits necessary to do useful calculations in a quantum computer would all feel the presence of each other, meaning that the information would leak in an uncontrollable way. The more qubits that are put together this way, the harder it is to control them.
The solution put forward by Dr Sean Barrett and Dr Pieter Kok, working at HP Laboratories Bristol, is to put every qubits in its own box, so that they cannot directly talk to each other. However, for quantum computing to work, there does need to be some interaction between qubits so that they can become entangled. In the HP Labs system this is achieved by using the fact that every qubit can emit light particles (photons).
Julian Richards | alfa
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20.07.2018 | American Institute of Physics
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For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
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Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
13.07.2018 | Event News
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