Jack Grealish scored in Aston Villa’s 4-2 win against Birmingham on Sunday and described the goal as the best moment of his career.Aston Villa were trailing at home to Birmingham by the 28th minute, but a quick double in the 37th and 39th minute saw the hosts lead 2-1 going into halftime, and Grealish found the net with a header for the second goal.“Ever since I was a little kid at school, these were the games I dreamed of playing in and I am lucky enough to play in it,” Grealish told Sky Sports.Aston Villa explains why they spent so much money on players Manuel R. Medina – September 6, 2019 According to Aston Villa’s chief executive, the team needed to spend £144.5 million on 12 players in order to stay competitive.“But to score just brings it to another level and it is probably the favorite moment of my career so far.“I do not even think I have scored a header in my life, but Albert [Adomah] put a great ball in at the back stick and I could not miss really. When it went in I was over the moon.”
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Citation: Researchers demonstrate entanglement of two quantum bits inside of a semiconductor (2012, April 13) retrieved 18 August 2019 from https://phys.org/news/2012-04-entanglement-quantum-bits-semiconductor.html Large scale qubit generation for quantum computing © 2012 Phys.Org Explore further (Phys.org) — Research into quantum bits (qubits) for use in a quantum computer has become tied to entanglement, the still mysterious phenomenon whereby subatomic particles exist in an entangled state such that any change to one happens simultaneously to the other, without communication or the passage of time. The reason entanglement of qubits is so important to the future of a quantum computer is because they are able to represent both a “1” and “0” state at the same time and because actions that cause a change in one entangled particle also cause the same change in its partner, theoretically allowing for processing speeds to increase exponentially when adding more entangled qubits. Thus far though, attempts to create entangled particles inside of a semiconductor material have been difficult to measure, and thus verify, due to their short lives. Journal information: Science Now however, a small group of researchers from Harvard University has succeeded in entangling two quantum bits inside of a semiconductor and holding on to them long enough for them to be measured. They describe how they achieved this feat in their paper published in the journal Science.In essence the team overcame the inherent instability of entangled pairs by adding a second electron to the qubits in the semiconducting material which would allow them to be defined by their spin states; doing so they write, added a second level of immunity from decoherence, where the qubit reverts to either a “0” or a “1” after a very short period of time. To cause the actual entanglement, all that was needed was an electrical charge. To make sure that what they thought was happening inside the material truly was, they measured the sample using state tomography.This experiment shows that creating entangled pairs inside of a material such as the semiconductor used, is no more difficult than doing so with such techniques as manipulating calcium atoms in a laser ion trap, the trick though has been to get them to hold their state long enough to be measured, and that’s what this team has achieved. It also demonstrates a process that the team says could be scaled up, a very important element in building a quantum computer. But this of course, just a first step towards building a quantum computer because entangled pairs of qubits would need to be lined up some distance apart from one another to allow for the construction of circuits. Thus far the team has entangled qubits just a few hundred nanometers apart, the goal is to reach at least a micron. More information: Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits, Science 13 April 2012: Vol. 336 no. 6078 pp. 202-205. DOI: 10.1126/science.1217692ABSTRACTQuantum computers have the potential to solve certain problems faster than classical computers. To exploit their power, it is necessary to perform interqubit operations and generate entangled states. Spin qubits are a promising candidate for implementing a quantum processor because of their potential for scalability and miniaturization. However, their weak interactions with the environment, which lead to their long coherence times, make interqubit operations challenging. We performed a controlled two-qubit operation between singlet-triplet qubits using a dynamically decoupled sequence that maintains the two-qubit coupling while decoupling each qubit from its fluctuating environment. Using state tomography, we measured the full density matrix of the system and determined the concurrence and the fidelity of the generated state, providing proof of entanglement.
November 1, 2006 4 min read Microsoft’s Vista promises to be the next big thing in Windows computing–literally. Will your PC be PC enough for Vista when it drops a few weeks from now? If not, AMD and Intel might be able to brighten your holidays. They’ve begun shipping a new generation of more powerful dual-core processors, forcing bone-deep price cuts on “old” dual-cores and Pentium-class chips.Just about any new computer will run Vista Starter or Basic now. Less clear is how much PC you’ll need to make the most of the new Windows. It depends on how graphical you want to be. Will you run the 3-D Aero “glass” interface? Make VoIP calls? Create a video blog? Watch TV on your PC? The extra vroom needed might still fit your budget.The long run-up to Vista has been hard on people who sell PCs–but great for people who buy them. Sales have languished for most of the year with a corresponding buildup in chip inventories and softening in prices. Intel and AMD finally began slashing 40 percent or more off first-generation dual-core prices last quarter to make room for a new dual-core generation.Competition being what it is, most of those savings get passed on to PC buyers as a mix of lower prices and hardware improvements. As recent corporate earning releases show, PC sellers have been giving away margin until it hurts.But lucky for Microsoft, hardware companies are playing through the pain. It starts with Intel and AMD, who can’t seem to stop one-upping each other with ever-faster and cooler chips. Intel’s new Core 2 Duo family forces deep price cuts in first-generation Core Duos that haven’t even had time to lose that new-chip smell. And the long-running Pentium line? That’s over. AMD’s new AM2 platform has a less dramatic debut–primarily, bringing DDR2 and other memory innovations to the midrange Athlon 64 X2 and top-of-the-line Athlon 64 FX-62. State of ReadinessAt first glance, Vista’s hardware requirements don’t sound that onerous–an 800MHz CPU for basic versions, a 1GHz engine for the Aero interface. Vendors haven’t sold PCs that slow in years, although millions are still out there, doing their jobs faithfully every day. But it’s not enough just to run Windows. You also need enough PC for bigger, better software versions–starting with Microsoft Office.It’s odd that clock speed is emphasized, because memory is much more important. Figure on a full gigabyte of system memory to be “Vista Ready” for Aero–and better make that DDR2 memory. Also, choose a processor with as much cache memory behind as wide a front-side bus as you can afford. Get at least 1MB of L2 cache–2MB would be better–and 4MB would put snap in your apps. And pick a graphics adapter with at least 128MB dedicated video memory.The impact can be seen in recent performance tests where Intel’s second-generation Core 2 Duo processor did 40 percent more work running at 2.66GHz than a first-generation dual core did at 3.6GHz. Either of the twin engines in Core 2 Duo can tap the full 4MB of cache they share as needed, but each first-generation dual-core engine is limited to 2MB. Core 2 Duo’s engines also benefit from a one-third wider front-side bus to memory and other efficiencies in Intel’s new Core microarchitecture.But these improvements sure complicate shopping. You can depend on vendors to label which Windows XP systems they’re selling today are Vista Ready or Vista Capable. But to get the most for your money, you may need to weigh two or three different options in each of the memory categories.PC vendors have been blowing out last-generation models and filling their price points with new, more powerful configurations up and down the product line. For example, at this writing, Dell’s cheapest Core 2 Duo model was packed with 1GB DDR2, 4MB L2, a 1066MHz FSB and nVidia Geforce video with 256MB. Price: $1,600–including a 20-inch flat panel!There’s just a lot more PC under the average price tag now. And Vista? Not a problem–at least, not for new PCs.Mike Hogan is Entrepreneur’s technology editor. Free Webinar | Sept 5: Tips and Tools for Making Progress Toward Important Goals Attend this free webinar and learn how you can maximize efficiency while getting the most critical things done right. This story appears in the November 2006 issue of Entrepreneur. Subscribe » Register Now »