Submitted by JMiszczak on Fri, 04/03/2011 - 08:55.
The original motivation to build a quantum computer came from Feynman, who imagined a machine capable of simulating generic quantum mechanical systems—a task that is believed to be intractable for classical computers. Such a machine could have far-reaching applications in the simulation of many-body quantum physics in condensed-matter, chemical and high-energy systems.
Submitted by JMiszczak on Fri, 25/02/2011 - 08:48.
James Dacey at PhysicsWorld writes: ''In a fascinating case of physics being turned on its head, a group of researchers at Yale University in the US has created an "anti-laser" that almost perfectly absorbs incoming beams of coherent light. The invention is based on a theoretical study reported last summer in which Douglas Stone and his Yale colleagues claimed that such a system could be possible in a device that they call a coherent perfect absorber (CPA).
Submitted by JMiszczak on Fri, 18/02/2011 - 09:25.
An EU-funded team of researchers has set out to provide mathematicians with their very own periodic table ... of shapes. Researchers at Imperial College London (ICL) in the UK are collaborating with colleagues in Australia, Japan and the Russian Federation to identify the basic building blocks of all possible shapes in the universe across three, four and five dimensions, and analyse how these components relate to each other.
Submitted by JMiszczak on Fri, 11/02/2011 - 19:07.
Belle Dumé at NanotechWeb writes: ''A new way to make complete and programmable logic circuits that combine both memory and logical processing in a single structure has been unveiled by physicists in Germany. Such structures could lead to smaller, faster and more energy-efficient integrated circuits and their development has been one of the main goals in spintronics – a relatively new technology that exploits the spin of an electron as well as its charge.
Submitted by JMiszczak on Wed, 02/02/2011 - 09:28.
The electronic chips of the future might not be made of silicon or even graphene but of a material called molybdenite (MoS2). EU-funded research presented in the journal Nature Nanotechnology demonstrates that molybdenite is a highly effective semi-conductor that could be used to make transistors both smaller and more energy efficient.
Submitted by JMiszczak on Fri, 28/01/2011 - 09:56.
James Dacey writes at PhysicsWorld: ''An international research group claims to have taken an essential step towards silicon-based quantum computing by entangling 10 billion identical quantum bits, or "qubits", inside a silicon crystal. This is the first time that "ensemble entanglement" has been demonstrated in a solid-state device, they claim. Where conventional computers store data as "bits" with value 1 or 0, in quantum computing data is stored as "qubits", which can hold more than one value at the same time.
Submitted by JMiszczak on Fri, 14/01/2011 - 14:38.
Jon Cartwright at PhysicsWorld writes: ''Two independent groups have demonstrated how a pair of entangled photons can transfer their entanglement to and from a solid – the process that should one day form the backbone of so-called quantum memories or repeaters. These devices would enable quantum communication systems to transmit information over larger distances, with significantly reduced degradation.''
Submitted by Mwiesniak on Thu, 06/01/2011 - 20:10.
Often we hear from young researchers that they have violated a Bell inequality with their new source by this and this factor. In such cases we usually forget about three basic underlying assumptions. Two of them are well known; Realism stating that outcomes of measurements exist before they are revealed in a measuring act and Locality forbidding superluminal communication between spatially separated laboratories. The third important assumption is Freedom exercised by the observers to choose their local measurements independently of each other.
Submitted by JMiszczak on Tue, 04/01/2011 - 21:08.
This special issue of International Journal Of Quantum Information is aimed to collect papers addressing both fundamental problems and applications, thus offering to readers comprehensive and up-to-date overview on the characterization and use of quantum correlations. We welcome papers that address fundamental aspects of quantum and classical correlations in discrete and continuous variable systems, propose implementations to make quantitative measurements of quantum correlations, or describe experiments that exploit quantum correlations as a resource for quantum technology.
Submitted by JMiszczak on Tue, 04/01/2011 - 08:38.
EU-funded scientists in the Netherlands have managed to rapidly control the building blocks of a quantum computer by using an electric field rather than a magnetic one. In addition, the team succeeded in embedding these building blocks, known as quantum bits or qubits, in a semiconductor nanowire. The study, published in the journal Nature, could lead to advances in the field of quantum computing and communication.