Hugh Pickens writes writes “Science Daily Headlines reports that researchers have applied a recently developed technique to directly measure the polarization states of light overcoming some important challenges of Heisenberg’s famous Uncertainty Principle and demonstrating that it is possible to measure key related variables, known as ‘conjugate’ variables, of a quantum particle or state directly. Such direct measurements of the wave-function had long seemed impossible because of a key tenet of the uncertainty principle — the idea that certain properties of a quantum system could be known only poorly if certain other related properties were known with precision. ‘The reason it wasn’t thought possible to measure two conjugate variables directly was because measuring one would destroy the wave-function before the other one could be measured,’ says co-author Jonathan Leach. The direct measurement technique employs a ‘trick’ to measure the first property in such a way that the system is not disturbed significantly and information about the second property can still be obtained. This careful measurement relies on the ‘weak measurement’ of the first property followed by a ‘strong measurement’ of the second property. First described 25 years ago, weak measurement requires that the coupling between the system and what is used to measure it be, as its name suggests, ‘weak,’ which means that the system is barely disturbed in the measurement process. The downside of this type of measurement is that a single measurement only provides a small amount of information, and to get an accurate readout, the process has to be repeated multiple times and the average taken. Researchers passed polarized light through two crystals of differing thicknesses: the first, a very thin crystal that ‘weakly’ measures the horizontal and vertical polarization state; the second, a much thicker crystal that ‘strongly’ measures the diagonal and anti-diagonal polarization state. As the first measurement was performed weakly, the system is not significantly disturbed, and therefore, information gained from the second measurement was still valid. This process is repeated several times to build up accurate statistics. Putting all of this together gives a full, direct characterization of the polarization states of the light.” Read more of this story at Slashdot.
More:
Physicists Discover a Way Around Heisenberg’s Uncertainty Principle
Sony had an event today and as expected, it introduced the PlayStation 4. The next-gen platform is designed to shift focus from the living room to the gamer, Sony said, and overall, PlayStation’s approach is meant to make it possible for gamers to play wherever they want, whenever they want. PS4 lead system architect Mark Cerny talked about how the evolution of the PS4 came about, saying it began five years ago, earlier on in the life of the PS3. The PS3 was a first step, which was designed to connect to a variety of services, but it was limited because of how early it launched in that world, Cerny said. “Much less value is found today in blast processing or a system-on-a-chip,” Cerny said. He suggested tech could interfere with design innovation. The tech remains important, he stressed, but the idea was to create a platform that was all about experience. Sound familiar? That’s because it’s a tune Apple and Steve Jobs started playing years ago when they realized the spec race was a nonstarter in the mobile phone world. “By game creators, for game creators. It is a powerful and accessible system,” Cerny said on stage, suggesting that this time around there was a strong emphasis on ease of development, hence the use of a standard x86 PC CPU. The GPU is designed for use with “practical tasks,” he said, with the overall goal of making development a painless experience. Essentially, the PS4 is an advanced, x86-based personal computer, which means that it should be easy for developers to build. All of this is clearly an answer to a major complaint from studios about the previous generation, which was infamously tricky to master from a software perspective. Sony also unveiled a redesigned DualShock 4 controller, which has the Vita-style touchpad depicted in rumors, ad works with a 3D “stereo” camera accessory to track its movements in a loose approximation of what’s possible with Microsoft’s Xbox Kinect. The hardware is clearly also borrowing some tricks from mobile games. It has save states that allow users to quickly freeze and resume gameplay, without having to save just by switching on and off the console. There’s also background downloading, which allows digital titles to be played before they’re even completely on your local drive. Social is another key tentpole for the PS4, according to Cerny. He described a new function that allows you to quickly pause and upload gameplay videos as easily as you might have done with static screenshots in the past. There’s also spectator functionality for watching “celebrities” gaming, something which seems to have been borrowed from Twitter’s success with famous members. Networking will also be based around real names and profile pictures, instead of strictly on gamer tags and avatars, too, and all of this will plug into mobile apps to help gamers stay in touch. 
netbuzz writes “Fed up with phishers using Google Forms to commandeer campus email accounts as spam engines, Oxford University recently blocked access to Google Docs for two-and-a-half hours in what it called an ‘extreme action’ designed to get the attention of both its users and Google. ‘Seeing multiple such incidents the other afternoon tipped things over the edge,’ Oxford explains in a blog post. ‘We considered these to be exceptional circumstances and felt that the impact on legitimate University business by temporarily suspending access to Google Docs was outweighed by the risks to University business by not taking such action.’ The move generated widespread complaints from those affected, as well as criticism from outside network professionals.” Read more of this story at Slashdot. 
Barnes & Noble has put up an excellent fight over the past few years against the rising tide of digital competitors like iPad, Kindle Fire, etc. But it would seem that the bookseller has still come up a bit short, as the Wall Street Journal reports that the company has plans to shut down nearly 20 stores per year over the course of the next decade. Just last week, we learned that B&N had a rough holiday sales season with a 10.9 percent sales decrease over last year’s holiday season. Barnes & Noble currently has around 689 retail stores in operation, but the cuts would eliminate around a third of those stores, leaving the total somewhere between 450 to 500 stores. However, Barnes & Noble’s Mitchell Klipper, who delivered the news to the WSJ, explains that less than 3 percent of B&N stores lose money. Still, shutting down stores is expected to strengthen B&N’s hardware business, including the Nook HD and Nook HD+, which has been a growing focus at the company. In the face of such a digital shift, it would appear that the bookseller expects its brick-and-mortar business to become more and more of a liability over the coming years. 
An anonymous reader writes “The H.265 codec standard, the successor of H.264, has been approved, promising support for 8k UHD and lower bandwidth, but the patent issues plaguing H.264 remain.” Here’s the announcement from the ITU. From the article: “Patents remain an important issue as it was with H.264, Google proposing WebM, a new codec standard based on VP8, back in 2010, one that would be royalties free. They also included it in Chrome, with the intent to replace H.264, but this attempt never materialized. Mozilla and Opera also included WebM in their browsers with the same purpose, but they never discarded H.264 because most of the video out there is coded with it. MPEG LA, the owner of a patent pool covering H.264, promised that H.264 internet videos delivered for free will be forever royalty free, but who knows what will happen with H.265? Will they request royalties for free content or not? It remains to be seen. In the meantime, H.264 remains the only codec with wide adoption, and H.265 will probably follow on its steps.” Read more of this story at Slashdot.