Simplifying the process of detecting genuine multiparticle entanglement

first_img Jungnitsch, a Ph.D. student at the Institute for Quantum Optics and Quantum Information at the Austrian Academy of Sciences in Innsbruck, Austria, has been working on a way to simplify the way that multiparticle entanglement is characterized. Along with Tobias Moroder and Otfried Gühne from the University of Siegen in Germany, Jungnitsch created criteria that can be easily implemented in experiments. Their work is published in Physical Review Letters: “Taming Multiparticle Entanglement.”To thank our 25,000 fans in the Facebook community, this story was posted on the Physorg.com FB page a few hours before going live on the main site“We developed a criterion that can easily be implemented so that others can use it,” Jungnitsch says. “Experimentalists can download it from the Internet and use it to measure entanglement. It provides results that others can understand, helping to let them know that these particles are really entangled.”The team from Austria and Germany used what they call “suitable relaxations” to develop their criteria. The method involves first considering a quantum state involving three particles. If the state can be separated out using different partitions, it is called biseparable. When in a biseparable state, the system is not considered to be entangled. If, however, the quantum state is not biseparable, it can be thought of as genuinely multiparticle-entangled, meaning that all particles are entangled and not only some of them.“There are many states that are entangled in some sense,” Jungnitsch points out, “but it’s not easy to see if they are genuinely entangled. We relaxed the definition a bit, and it still works pretty well. Our method won’t work for all entangled states, but you can still catch the phenomena of entanglement pretty well.” “The point is to make sure that your particles are in a genuinely entangled state,” Jungnitsch continues. “In many cases, you want to know if all of the items prepared are entangled.” Otherwise, for some operations, you might not get the desired results. “When particles are genuinely entangled, they can be useful for a number of operations. Our criteria can help experimentalists verify that the state really is entangled. It’s something useful and practical.”Jungnitsch says that they have already provided the code for download. “It can be used in experiments now,” he says. “We wrote the code and put it on the Internet. Experimentalists can download and then run the code on their own computers as part of their efforts to see whether or not their multiparticle systems are entangled.”Some refining is still possible, however. “We have been working on applying the code to specific states – important states.” Because there are some applications that require certain quantum states, being able to detect whether or not particles have reached those states is important. With some adjustments to the code, it should be possible to characterize such entangled states even more accurately.“Of course, the long view is always quantum computers,” Jungnitsch acknowledges. “But there are other applications for quantum correlations as well. The first step to many of these applications, and to improving quantum information processing, is to verify entangled states. Our efforts can help with that.” (PhysOrg.com) — The ability to entangle particles is considered essential for a number of experiments and applications. While we have seen evidence for quantum entanglement, it is still difficult to detect unambiguously. Multiparticle quantum correlations are especially important for work with optical lattices, superconducting qubits and quantum information processing. “Entanglement in large qubit systems is becoming more important,” Bastian Jungnitsch tells PhysOrg.com. “Unfortunately, the characterization of multiparticle entanglement is difficult.” The structure of multiparticle entanglement for three particles. The team approximates the set of unentangled states (shown in blue) by a larger set (shown with a thick, red border), which has the advantage that the latter is much easier to handle theoretically. This idea leads to an efficient, easily implementable criterion for multiparticle entanglement. The figure was drawn by Bastian Jungnitsch. Copyright 2011 PhysOrg.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. Entanglement can help in classical communication More information: Bastian Jungnitsch, Tobias Moroder, Otfried Gühne, “Taming Multiparticle Entanglement,” Physical Review Letters (2011). Available online: link.aps.org/doi/10.1103/PhysRevLett.106.190502 Explore further Citation: Simplifying the process of detecting genuine multiparticle entanglement (2011, May 20) retrieved 18 August 2019 from https://phys.org/news/2011-05-genuine-multiparticle-entanglement.html 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.last_img read more

Going the Indian Ocean way

first_imgThe contemporary fusion music band members, known to drive fans into frenzy, were also present at the event to mesmerize the audience. The author and the band members together revealed the band’s behind the scene story.Formed in the early 90’s Indian Ocean has been one of the spearheads of the Indian Rock Scene. Their unique sound of Contemporary Rock mixed with classical, jazz and fusion have earned them a cult following.Their band has managed to maintain this inimitable sound in all their albums and have attained some rave reviews from the critics. Some of the themes of their songs are Sufism, environmentalism and mythology. Definitely exclusive in what they do, Indian Ocean have toured all over India and played all across the globe. Also Read – ‘Playing Jojo was emotionally exhausting’Parragon Publishing, which is the largest illustrated non-fiction publisher in the world, will be coming out with a book on the band soon, which is a first of its kind for a music band in India. It is a significant accomplishment for the band, as the publishing house in the past has done such books on iconic musicians like Michael Jackson, Rolling Stones, The Beatles, Elvis Presley and John Lennon among others.The core thought behind the book is the fact that Indian Ocean has a huge, ardent fan following – who would love to know and see parts of the journey of the band, which is more than two decades and still going strong. Also Read – Leslie doing new comedy special with NetflixThe band has had staggering achievements over the years and the book unfolds the unique story of four untrained young musicians making a band. It has been a long, eventful career with an inventory of many firsts. Indian Ocean was the first band to release a Live album – Desert Rain continues to sell even 17 years after it was recorded almost as an afterthought! Indian Ocean is the first band to release a Live DVD.They were the first band ever in India to have a documentary made on them. The film Leaving Home, directed by Jaideep Varma won the National award and is the first ever indigenous documentary film to have achieved a commercial release in the country. Adding to the list of firsts, is the book on them by Parragon Publishing India.last_img read more

Presiding officer run over by train says N Dinajpur DM

first_imgBalurghat: North Dinajpur District Magistrate Ayesha Rani A in a press conference on Wednesday evening said presiding officer Rajkumar Roy whose body was found beside a railway track might have been run over by a train.However, she said the CID has been told to conduct a thorough investigation to reveal Roy’s mystery death following the direction of the State Election Commission.Meanwhile, Chief Minister Mamata Banerjee, while addressing a Press conference at Nabanna, said she would definitely look into the compensation aspect. Also Read – Heavy rain hits traffic, flightsSome of the polling personnel who had assisted Roy at booth no 48 of Itahar block on Monday’s poll who attended the Press meeting, said there was no untoward incident as such. They said Roy had left the booth but did not come back.The mutilated body of Roy was found along the tracks located in Raiganj’s Sonadangi area by the locals on Tuesday. Apparently, it was apprehended that Roy was murdered as his body lay in a pool of blood beside the tracks. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedRoy was posted as an assistant teacher of English in Rahatpur High madarsa of Karandighi. Around 8 pm on Monday, intimating other polling personnel, he left for the toilet but didn’t return. His phone was also switched off. A missing complaint was lodged at the police station by the concerned BDO. Roy hailed from Siliguri’s Phansidewa. He is survived by his wife and two children.On Wednesday, the polling personnel, mostly school teachers, hit the street in Raiganj claiming that Roy was first abducted and then murdered. They raised the issue of ‘insecurity of polling personnel’ and had also boycotted counting duty on Thursday and resorted to a demonstration.Police superintendent Shyam Singh said he had been informed about the incident of the train accident that supposedly claimed Roy’s life by the GRP on Tuesday. He also claimed that the polling had been peacefully conducted where Roy was deployed.last_img read more

Super foods to be included in your beauty regimen

first_imgSuper foods are no longer just to be found at the grocery store. They’re now taking over the beauty aisles too. Nutrient packed foods are popping up nowadays to give your hair and skin that much needed boost so go for it girls. Basil extracts can work wonders for your hair. This infusion rejuvenates hair follicles, keeps your scalp cool, and also promotes circulation. Sugarcane extracts are an excellent source of minerals that support hair growth. Sugarcane is often termed a health drink as it contains vitamins like vitamin B12, vitamin C and vitamin A along with other elements like zinc, potassium manganese and calcium. All these nutrients together make up the ingredients of long shiny hair. Also Read – Add new books to your shelfApples have fibre content called pyrus malus. This type of fibre can serve as a balancing of pH levels in the hair and helps clean the dirt from the scalp so you can be free of dandruff. Using products infused with Olive Oil can reduce dandruff flakes and help retain moisture in the hair Avocado extracts are great when used in the hair mask. It nourishes as well as strengthens leaving the hair full of life. Grapefruits are fruits that are high in fibre and low in calories, and they contain bio-flavonoids and other plant chemicals that protect against serious diseases. The vitamin C and the antioxidant effects protect the skin from environmental hazards. It also stimulates the production of skin collagen that brings smoothness and elasticity to the skin. Also Read – Over 2 hours screen time daily will make your kids impulsiveThe retinol antioxidant gives the skin softness and, renews damaged skin. The potassium present in the grapefruit helps to smooth wrinkles and age spots and provides a protective shield against UV rays. The super food Kiwi is a powerhouse of nutrients and offers a usual array of health promising substances. The kiwi is particularly rich in antioxidant, especially Vitamins C and E as well as polyphenols. Ideal to protect young skin, Kiwi helps to prevent oxidative stress and protect from the damaging effects of pollutants. Kiwi is also an excellent source of Vitamin E that prevents the formation of free radicals that helps you achieve great skin.last_img read more

War of Words After HP Announces Split Dell Swipes Back

first_img This story originally appeared on Fortune Magazine October 7, 2014 3 min read Hewlett-Packard’s decision to split off its enterprise hardware and services unit from its computer and printer business represents a major turning point for a company in the midst of a multi-year plan to turn around its fortunes. In other words, what better time for Dell to take a shot at H-P, its biggest competitor?In the wake of H-P’s announced split, which will result in two separately-listed companies, Dell quickly made a play likely aimed at picking up some of H-P’s customers. “Dell is singularly focused on its customers and partners and is committed to providing end-to-end IT solutions that they need,” David Frink, a Dell spokesman, said in a statement to Bloomberg on Monday. “H-P’s decision to break apart its business is complex, distracting and appears to benefit HP and its shareholders more than its customers.”Dell’s Frink also told the Austin American-Statesman that it will be very difficult for H-P to completely separate its business operations and that similar processes at other large companies “have often taken years to complete.”If Dell’s swipe at H-P sounds familiar that’s probably because Dell is actually taking its cues directly from a statement H-P put out more than a year ago, when the former first announced its plans to go private through a leveraged buyout by CEO and founder Michael Dell and private equity firm Silver Lake Management. When Dell first announced its plan to go private as part of its own turnaround plan, H-P issued a statement saying that the company had “a very tough road ahead.”“[Dell] faces an extended period of uncertainty and transition that will not be good for its customers,” H-P said in February 2013. “And with a significant debt load, Dell’s ability to invest in new products and services will be extremely limited. Leveraged buyouts tend to leave existing customers and innovation at the curb. We believe Dell’s customers will now be eager to explore alternatives, and HP plans to take full advantage of that opportunity.”The tone and message of both comments are nearly identical: Cast doubt over whether or not the move will be successful, while questioning your competitor’s commitment to its customers.Of course, it’s hard to expect anything different from two long-time rivals. In addition to competing for customers for years, the two tech companies have also gone head-to-head over potential acquisitions, including in 2010, when H-P bought 3PAR for $2.35 billion following a month-long bidding war with Dell for the data-storage company.More recently, both companies have been linked to potential merger talks with data-storage giant EMC Corporation. And, while the EMC-H-P merger talks reportedly died last month after the two sides failed to reach a consensus on financial terms, H-P’s CEO Meg Whitman is not ruling out the possibility of a deal coming together eventually. Speaking at Fortune‘s Most Powerful Women Summit on Monday, Whitman said her company’s M&A strategy “is very much returned base and what is in the best interest of shareholders.” How Success Happens Hear from Polar Explorers, ultra marathoners, authors, artists and a range of other unique personalities to better understand the traits that make excellence possible. Listen Nowlast_img read more

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Obama’s allowing people who came to the country illegally to stay. read more