More News in Quantum Computing!

quantum-computers-The-Next-GenerationRecently, a team of researchers at the University of Rochester conducted an experiment where they managed to suspend a nano-sized diamond in free space with a laser. The purpose of the experiment was to measure the amount of light emitted from the diamond, but had the added bonus of demonstrating applications that could be useful in the field of quantum computing.

For those unfamiliar with the concept, quantum computing differs from conventional computing since it does not rely on sending information via a series of particles (electrons) through one-way channels. Instead, quantum computing relies on the process of beaming the states of particles (i.e. a photons quantum properties) from one location to the next.

nanodiamondSince this process occurs faster than the speed of light (as no movement takes place) and qubits (quantum bits) have the ability to be in more than one state simultaneously, computations done using this model would be exponentially faster. But despite many advancements made in recent years, the field remains largely theoretical and elusive.

To conduct their experiment, the researchers focused a laser into a 25 cm (10 inch) chamber and then sprayed an aerosol containing dissolved nanodiamonds inside. These nanodiamonds were attracted to the laser in a technique known as “laser trapping”, until a single particle was isolated and made to levitate. Once the tiny gem was levitating in free space, the researchers used another laser to make defects within the diamond emit light at given frequencies.

nanodiamond1This process is known as photoluminescence – a form light emission that is caused by defects in the tiny diamond that allows for the absorptions of photons. When the system is excited, it changes the spin; and when the it relaxes after the change, other photons are emitted. This occurs because nitrogen atoms replace some of the carbon atoms in the diamond. Once the nitrogen is nested in the diamond’s atomic structure, it is possible to excite electrons with a laser.

According to the researchers, this photoluminescence process has the potential to excite the system and cause what is known as Bohr spin quantum jumps, which are changes in spin configuration of the internal defect. This occurs because nitrogen atoms replace some of the carbon atoms in the diamond. Once the nitrogen is nested in the diamond’s atomic structure, it is possible to excite electrons with a laser.

????????????????????In addition, the potential also exists to turn the nanodiamond into an optomechanical resonator. According to Nick Vamivakas, an assistant professor of optics at the University of Rochester, these are structures in which the vibrations of the system can be controlled by light. Optomechanical resonators have the potential to be used as incredibly precise sensors, which could lead to uses in microchips.

In addition, these resonator systems have the potential to create Schrödinger Cat states, which are typically not found in microscopic objects. As anyone who’ familiar with Futurama or Big Bang Theory may recall, this refers to the thought experiment where a cat is inside a box with poison, and until someone opens the box and determines its whereabouts, the cat could be considered simultaneously both alive and dead.

^Being able to stimulate matter so that it can exist in more than one state at any given time is not only revolutionary, it is a clear step towards the creation of machines that exploit this principle to perform computations. According to Nick Vamivakas, an assistant professor of optics at the University of Rochester, explained:

Cat or cat-like states contradict our everyday experiences since we do not see common things in quantum states. The question is: where is this boundary between microscopic and macroscopic? By generating quantum states of larger and larger objects, we can hone in on a boundary … if there is one.

Naturally, the Rochester team is still a long way from achieving their big breakthrough, and Vamivakas himself admits that he does not know how far away a quantum computing truly is. In terms of this latest experiment, the team still needs to cool the crystal better, which they are hoping can be achieved with a few technical improvements. And then they hope to find a better way of running the experiment than spraying nanodiamond dust into a tube.

In the meantime, check out this video of the experiment. It promises to be “illuminating” (sorry!):


Big News in Quantum Computing!

^For many years, scientists have looked at the field of quantum machinery as the next big wave in computing. Whereas conventional computing involves sending information via a series of particles (electrons), quantum computing relies on the process of beaming the states of these particles from one location to the next. This process, which occurs faster than the speed of light since no movement takes place, would make computers exponentially faster and more efficient, and lead to an explosion in machine intelligence. And while the technology has yet to be realized, every day brings us one step closer…

One important step happened earlier this month with the installment of the D-Wave Two over at the Quantum Artificial Intelligence Lab (QAIL) at the Ames Research Center in Silicon Valley, NASA has announced that this is precisely what they intend to pursue. Not surprisingly, the ARC is only the second lab in the world to have a quantum computer.  The only other lab to possess the 512-qubit, cryogenically cooled machine is the defense contractor Lockheed Martin, which upgraded to a D-Wave Two in 2011.

D-Wave’s new 512-qubit Vesuvius chip
D-Wave’s new 512-qubit Vesuvius chip

And while there are still some who question the categorization of the a D-Wave Two as a true quantum computer, most critics have acquiesced since many of its components function in accordance with the basic principle. And NASA, Google, and the people at the Universities Space Research Association (USRA) even ran some tests to confirm that the quantum computer offered a speed boost over conventional supercomputers — and it passed.

The new lab, which will be situated at NASA’s Advanced Supercomputing Facility at the Ames Research Center, will be operated by NASA, Google, and the USRA. NASA and Google will each get 40% of the system’s computing time, with the remaining 20% being divvied up by the USRA to researchers at various American universities. NASA and Google will primarily use the quantum computer to advance a branch of artificial intelligence called machine learning, which is tasked with developing algorithms that optimize themselves with experience.

nasa-ames-research-center-partyAs for what specific machine learning tasks NASA and Google actually have in mind, we can only guess. But it’s a fair bet that NASA will be interested in optimizing flight paths to other planets, or devising a safer/better/faster landing procedure for the next Mars rover. As for Google, the smart money says they will be using their time to develop complex AI algorithms for their self-driving cars, as well optimizing their search engines, and Google+.

But in the end, its the long-range possibilities that offer the most excitement here. With NASA and Google now firmly in command of a quantum processor, some of best and brightest minds in the world will now be working to forward the field of artificial intelligence, space flight, and high-tech. It will be quite exciting to see what they produce…

photon_laserAnother important step took place back in March, when researchers at Yale University announced that they had developed a new way to change the quantum state of photons, the elementary particles researchers hope to use for quantum memory. This is good news, because it effectively demonstrated that true quantum computing – the kind that utilizes qubits for all of its processes – has continually eluded scientists and researchers in recent years.

To break it down, today’s computers are restricted in that they store information as bits – where each bit holds either a “1″ or a “0.” But a quantum computer is built around qubits (quantum bits) that can store a 1, a 0 or any combination of both at the same time. And while the qubits would make up the equivalent of a processor in a quantum computer, some sort of quantum Random Access Memory (RAM) is also needed.

Photon_follow8Gerhard Kirchmair, one of Yale researchers, explained in a recent interview with Nature magazine that photons are a good choice for this because they can retain a quantum state for a long time over a long distance. But you’ll want to change the quantum information stored in the photons from time to time. What the Yale team has developed is essentially a way to temporarily make the photons used for memory “writeable,” and then switch them back into a more stable state.

To do this, Kirchmair and his associates took advantage of what’s known as a “Kerr medium”, a law that states how certain mediums will refract light in a different ways depending on the amount shined on it. This is different from normal material materials that refract light and any other form of electromagnetic field the same regardless of how much they are exposed to.

Higgs-bosonThus, by exposing photons to a microwave field in a Kerr medium, they were able to manipulate the quantum states of photons, making them the perfect means for quantum memory storage. At the same time, they knew that storing these memory photons in a Kerr medium would prove unstable, so they added a vacuum filled aluminum resonator to act as a coupler. When the resonator is decoupled, the photons are stable. When resonator is coupled, the photons are “writeable”, allowing a user to input information and store it effectively.

This is not the first or only instance of researchers finding ways to toy with the state of photons, but it is currently the most stable and effective. And coupled with other efforts, such as the development of photonic transistors and other such components, or new ways to create photons seemingly out of thin air, we could be just a few years away from the first full and bona fide quantum processor!


The Future is Here: The Li-Fi Network

lifi_internet1Scientists have been looking at optics for some time as a means of enhancing the usual means of data processing. In terms of computing, it means that using optical components – which use photons rather than electrons to transmit information – could lead to computers that can run exponentially faster than those that use traditional electronics. But a group of German scientists have taken that a step farther, proposing an internet that runs on the same principles.

Using conventional LED bulbs in a laboratory setting, researchers at the Fraunhofer Henrich Hertz Institute (HHI) in Germany successfully transmitted data at 3Gbps using conventional. In a real-world setting, the same system was capable of transmitting data at rate of 500Mbps, roughly a dozen to hundreds of times what a conventional WiFi network is capable of transmitting.

optical_computer1The concept of visible light communications (VLC), or LiFi as it is sometimes known, has received a lot of attention in recent years, mostly due to the growing prevalence of LED technology. Much like other solid-state electronics, LEDs can be controlled as any other electronic component can. By extension, a VLC network can be created along the same lines as a WiFi one, using terahertz radiation (light) instead of microwaves and an LED bulb instead of an oscillating a WiFi transmitter, and photodetectors instead of antennas.

Compared to WiFi, the LiFi concept comes with a slew of advantages. First of all, it can turn any LED lamp into a network connection, and since it operates at such high frequencies, is well beyond the range of the current regulatory licensing framework. For the same reason, LiFi can be used in areas where extensive RF (radio-frequency) interference is common, such as on airplanes, in airports and hospitals. The Fraunhofer researchers even claim that VLC improves privacy, since the signal is directed from one box to another and not made up waves that can be easily picked up on by a third party.

Optical_ComputerBut of course, there is still much research and development that needs to be done. As it stands, the Fraunhoer research is limited in terms of how much information can be sent and how much distance it can travel. In order to compete with conventional WiFi, a system that uses optics to transmit information will have to be able to demonstrate the ability to pack a significant amount of bandwidth into a signal that can reach in excess of 100 m.

Nevertheless, there are numerous startups that are making headway, and many more researchers who are adapting optical components for computers as we speak. As a result, it shouldn’t be long before signs like this are appearing everywhere in your neighborhood…