Scientists in the US have demonstrated a new technique for generating photons for use in optical quantum information processing: using a laser to excite a single photon from a cloud of rubidium gas.The technique, developed at the Georgia Institute of Technology Research, exploits the properties of an atom in which one or more electrons has been excited near ionisation energy levels, the so-called Rydberg state.
Qubits and Pieces
News from the frontline of the weird and wonderful world of quantum computing.
<p>Lucy Sherriff is a journalist, science geek and general liker of all things techie and clever. In a previous life she put her physics degree to moderately good use by writing about science for that other tech website, The Register. After a bit of a break, it seemed like a good time to start blogging about weird quantum stuff for ZDNet. And so here we are. </p>
Researchers at the Max Planck Institute of Quantum Optics (MPQ) are claiming a world first with a demonstration of a quantum switching network. The Institute reports data being exchanged successfully "with high efficiency and fidelity" between two quantum nodes installed in two separate labs, connected by a 60-metre long optical fibre.
Diamonds are forever in the movies, and now they are making a stab at eternity in quantum computing.An international group of scientists have built a working quantum computer inside a diamond, and for the first time, have included protection against decoherence.
Researchers at Ruhr-Universitat Bochum report the creation of electron qubits in semiconductors. So far, the team says, electron qubits have all been created in a vacuum, so this development really does look like a next step on the oft-mentioned road to quantum computing.
As if its list of properties was not already impressive enough, materials scientists working with sophisticated computer models at Stanford University have added another useful trick to graphene’s repertoire: they have made it piezoelectric."We thought the piezoelectric effect would be present, but relatively small.
Graphene may be a wonder material, poised to revolutionise the electronics industry; with applications far beyond the humble CPU. But it isn’t magic.
Scientists at UCLA have put a Lightscribe DVD optical drive to work in their graphene research, and have used them to produce a graphene-based electrochemical supercapcitor that could make itself very useful in a world ever more dependent on battery power.In a paper published in the March 16 edition of the journal Science, the researchers explain that electrochemical capacitors have attracted a lot of interest because they can be charged and discharged much faster than traditional batteries.
Researchers at Berkeley Lab have discovered that they can control the Curie temperature, and hence the magnetism of the semiconductor gallium manganese arsenide (GaMnAs). The breakthrough settles a long running controversy over the usefulness of the material in the emerging field of spintronics.
IBM researchers will announce at the annual meeting of the American Physical Society in Boston today that they have established three new records for error correction in quantum computing.In a paper submitted on Feb 23rd for the conference, the researchers report a 95 per cent success rate with a two-qubit CNOT operation.
It has been a good week for quantum computing. Scientists in Australia announced that they have successfully built a single atom transistor, and researchers writing in Nature, have demonstrated an error correction technique that could make quantum computers more reliable.
Lab tests have confirmed theoretical predictions about the shear and strain that single sheets of graphene can withstand, bringing industrial and commercial applications of the material a step closer.The two-dimensional, hexagonal lattice of carbon has piqued the interest of display and solar cell manufacturers because of its transparency and high conductivity.
Under the watchful eye of Dr Karl Coleman who won the 2011 Royal Society of Chemistry's 'Chemistry World Entrepreneur of the Year', Durham University is spinning out a company to develop the technology for mass production of our favourite two-dimensional material; graphene.The company is betting on its so-called "bottom-up" chemical vapour deposition manufacturing process.
The Manchester University team that first isolated graphene has discovered a way of introducing a band gap into the material that makes it a much more promising candidate for building transistors.Graphene is famous for its astonishing list of useful characteristics – especially its conductivity.
Theoretical physicists working at Harvard and the Joint Quantum Institute in the US have joined forces with their Danish colleagues at the Niels Bohr Institute, to design a nanoscale loud speaker that could help make MRI scanners smaller, and might one day find a use in a future quantum computer.The 'speaker' they have conceived still needs to be tested experimentally.
Graphene might be stealing all the headlines, but other forms of carbon are still making waves in the emerging field of spintronics.So says researcher Michel de Jong, based at the University of Twente in the Netherlands.