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Quantum Computing

A new method of quantum cryptography makes it possible to encode a photon with many differ...

Quantum cryptography has been around since the 1980's but up until now only very small packets of information have been able to be encrypted at one time. Now a breakthrough that identifies the angle and rotation of photon particles is taking this technology to the next level.  Read More

The University of Oregon's Michael G. Raymer has changed the color of individual photons w...

Physicists from the University of Oregon have successfully changed the color of individual photons within a fiber optic cable. They were able to do so by focusing a dual-color burst of light from two lasers onto an optical cable carrying a single photon of a distinct color. Through a process known as Bragg scattering, a small amount of energy was exchanged between the laser light and the photon, causing the photon to change color. The achievement could pave the way for transferring and receiving high volumes of secured electronic data.  Read More

Researchers at Yale University are using laser light to cool molecules (Image: John Barry/...

In order for quantum computers to become a reality, it would be hugely helpful if scientists were able to supercool molecules. If a temperature of near absolute zero (-273C/-460F) could be achieved, then the oscillations associated with the molecules’ low energies could be used in the creation of quantum bits for use in quantum processors. Recently, researchers at Yale University got a step closer to that goal, by using laser light to cool molecules.  Read More

The photonic chip next to a UK penny. The chip contains micrometer and sub-micrometer feat...

Research conducted at the University of Bristol means a number of quantum computing algorithms may soon be able to execute calculations of a complexity far beyond what today's computers allow us to do. The breakthrough involves the use of a specially designed optical chip to perform what's known as a "quantum walk" with two particles ... and it suggests the era of quantum computing may be approaching faster than the scientific establishment had predicted.  Read More

Experimental setup for THz-pump and optical-probe measurements used by the researchers

It’s a sign of the times when the speed of electrons moving through wires is seen as pedestrian, but that’s increasingly the case as technology moves towards the new world of optical communication and computing. Optical communication systems that use the speed of light as the signal are still controlled and limited by electrical signaling at the end. But physicists have now discovered a way to use a gallium arsenide nanodevice as a signal processor at “terahertz” speeds that could help end the bottleneck.  Read More

A high-energy laser pulse (red) can modify the state of a phosphorus electron (yellow) wit...

An international team of researchers from the University of Surrey, UCL, Heriot-Watt University and the FOM Institute for Plasma Physics have used infra-red laser to obtain precise control of the quantum superpositions of an electron in silicon for the first time . This feat marks yet another leap toward the dream of an affordable, fast and reliable quantum computer.  Read More

A diamond-based nanowire device (Illustrated by Jay Penni)

Current computers operate using binary coding; thousands to trillions of small electrical circuits representing a binary digit (bit) of information that represent a "1" when the circuit is switched on and a "0" when switched off by means of an electronic switch. The future of computing is to move this to a quantum scale, where the weird properties of subatomic particles can be used to create much faster computers. A new device developed by Harvard scientists which uses nanostructured diamond wire to provide a bright, stable source of single photons at room temperature represents a breakthrough in making this quantum technology a reality.  Read More

Jason Petta, an assistant professor of physics, has found a way to alter the property of a...

The superfast computers of tomorrow will likely be able to manipulate individual electrons, harnessing their charge and magnetism to achieve massive data storage and outstanding processing speeds at very low power requirements. But how exactly do you go about manipulating single electrons independently, without affecting the ones nearby? Princeton University's Jason Petta has recently demonstrated a way to do just that in a breakthrough for the field of spintronics that brings faster and low-power number-crunching closer to reality.  Read More

This single-atom transistor could prove extremely useful in the development of a better qu...

As far as transistor size is concerned, it doesn't get any smaller than this. An international group of researchers from the Helsinki University of Technology, the University of New South Wales and the University of Melbourne have successfully built a fully working transistor that is just one atom in size, smashing previous records and, more importantly, creating a very unique venue to study phenomena to be exploited in the rapidly developing field of quantum computing.  Read More

An electromagnetic waveguide placed on diamond crystals can deliver fields strong enough t...

Scientists at UC Santa Barbara have made important advances in the field of spintronics by demonstrating the ability to electrically manipulate, at room temperatures, the quantum states of electrons trapped in the atomic structural defects of diamond crystals. Despite previous indications to the contrary, such quantum states can be manipulated very quickly, even at gigahertz frequencies, paving the way to significantly faster quantum computing.  Read More

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