Tag: 阿拉爱上海aishedes

SA matric results up by 7%

first_img. (Image: Flickr) Despite schooldays lost to the Fifa World Cup and a prolonged public servants’ strike, South African students writing the national matric exams in 2010 managed to score a 67.8% pass rate – a 7.2% improvement on the previous year’s result. An elated Angie Motshekga, minister of the Department of Basic Education, announced the results on Thursday at the Union Buildings in Pretoria. The pass rate for the 2009 matric – South Africa’s school-leaving qualification – was 60.6%.“We’d like to congratulate the class of 2010, they did us proud,” Motshekga said. “Their unrelenting determination is commendable. The class of 2010 is truly distinctive.”Motshekga stressed the integrity of the results, saying they were a true reflection of the achievement of students and that their quality had been properly vetted by the national education quality assurance body Umalusi. “We’ve worked hard to ensure the credibility of the exams. Umalusi convened standardisation of exams on 24 December to ensure the quality of results is the same as in other years.”The best-performing provinces were Gauteng and the Western Cape, with pass rates of 78.6% and 76.8% respectively. But all nine provinces registered a marked improvement on the 2009 results:•    Gauteng: 78.6% (71.8% in 2009)•    Western Cape: 76.8% (75.7% in 2009)•    North West: 75.7% (67.5% in 2009)•    Northern Cape: 72.3% (61% in 2009)•    KwaZulu-Natal: 70.7% (61.1% in 2009)•    Free State: 70.7% (69.4% in 2009)•    Eastern Cape: 58.3% (51% in 2009)•    Limpopo: 57.9% (48.9% in 2009)•    Mpumalanga: 56.8% (47.9% in 2009)last_img read more

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Jaish-e-Mohammad’s Fayaz Panzoo killed in Anantnag encounter

first_imgTwo militants were killed in an encounter in Anantnag’s Bijbehara area.A police spokesman said Jaish-e-Mohammad’s Fayaz Panzoo has been killed along with his associate. “Panzoo was a top commander and was involved in the attack on CRPF at Anantnag town on June 12, 2019 in which 5 CRPF personnel were killed and SHO Arshad Khan was seriously injured, who also succumbed to injuries,” said the police.last_img

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Heat beat Knicks in Dwyane Wade’s final Madison Square Garden game

first_imgTrump tells impeachment jokes at annual turkey pardon event Dion Waiters scored 28 points, Wade added 16 and the Miami Heat beat the Knicks 100-92.“You love playing here. You hear about it,” said Wade, who stuck around after the final buzzer to take in the love from the crowd that serenade him with chants of ‘D-Wade! D-Wade!’ throughout the night.FEATURED STORIESSPORTSPrivate companies step in to help SEA Games hostingSPORTSPalace wants Cayetano’s PHISGOC Foundation probed over corruption chargesSPORTSSingapore latest to raise issue on SEA Games food, logistics“When I played in college, I got the opportunity to play here, the Coaches vs Cancer Classic. It was just immediately, that feel, and the feel was there. Getting an opportunity to play (here) in the NBA has been special.”Wade had 17 points in leading Marquette past Villanova in that game on Nov. 15, 2002. TIP-INS:Heat: Wade averaged 23.6 points in 44 regular season games at Madison Square Garden.Knicks: Mitchell Robinson started at center and finished with nine points and 14 rebounds. Prior to the game, Knicks coach David Fizdale said he wanted to get a better look at the second-round pick from the 2018 draft over the last two weeks of the regular season.THANKING WADEWade’s tribute video included a warm message from Fizdale, who won two NBA titles as a Miami assistant coach from 2008-16.The Knicks coach recalled a game Wade won while both teams on the court couldn’t get anything “right.”But Wade found a way to put the Heat over Chicago in double overtime.“He stole the ball at the end of the game and made a running halfcourt shot to end the game. It was literally a bloodbath. I’ll never forget that night,” Fizdale recalled. “We’re battling like crazy. And somehow he figured out how to get us a win.”UP NEXTHeat: Visit the Boston Celtics on Monday for the first game of a home-and-home series. View comments Miami Heat guard Dwyane Wade (3) moves the ball against New York Knicks guard Emmanuel Mudiay (1) during the first half of an NBA basketball game Saturday, March 30, 2019, in New York. The Heat won 100-92. (AP Photo/Nicole Sweet)NEW YORK — Dwyane Wade felt something special about Madison Square Garden since first stepping on its floor during his sophomore season in college.The 13-time All-Star bid farewell to the arena Saturday night by planting a kiss on the New York Knicks logo at center court.ADVERTISEMENT Don’t miss out on the latest news and information. PH underwater hockey team aims to make waves in SEA Games PLAY LIST 02:42PH underwater hockey team aims to make waves in SEA Games01:44Philippines marks anniversary of massacre with calls for justice01:19Fire erupts in Barangay Tatalon in Quezon City01:07Trump talks impeachment while meeting NCAA athletes02:49World-class track facilities installed at NCC for SEA Games02:11Trump awards medals to Jon Voight, Alison Krauss Wintry storm delivers US travel woes before Thanksgiving MOST READ Emmanuel Mudiay scored 24 points for the Knicks, who have lost six straight and 14 of 15.The Knicks led 61-55 at the half but managed to score just 31 points over the last two quarters, shooting just 12 for 36 from the field, including 5 for 21 in the last period.New York, which has lost eight straight games at home, seemed like it was going to spoil Wade’s last visit to one of his favorite arenas.But he followed Whiteside’s basket with two of his own before Whiteside made two free throws to make it 87-79 with 9:29 to go.The three-time NBA champion received a nice hand from the Garden crowd when he walked to the scorer’s table for the first time midway through the first quarter. Wade was then greeted with a standing ovation when he checked into the game with 4:37 left in the period.“As a player, this is your last time and just want to enjoy it,” Wade added. “I know the fans stayed around and that was so cool, man, to be able to have that. You expect it at home maybe your last time but on the road you don’t expect that.”New York honored Wade’s 15-year career with a video tribute with 2:47 remaining in the opening period after a Miami timeout.Wade then drove to the basket for his first points of the night.“One of the top-5, if not top-3 best shooting guards to ever play this game,” Knicks guard Dennis Smith Jr. said.“Super competitor. Even better person. You got to salute everything he’s done and accomplished in this league.” Bloomberg: US would benefit from more, not fewer, immigrantscenter_img LATEST STORIES Colombia protesters vow new strike after talks hit snag Wade had back-to-back baskets in Miami’s 8-0 run to start the fourth quarter after the game was tied through three. He shot 6 for 16 and added seven rebounds in 27 minutes off the bench.Miami coach Erik Spoelstra thought of the old Heat-Knicks rivalry and found the pro-Miami crowd like something of the Twilight Zone.“To hear all the cheers and all the ‘Let’s Go Heat,’ it all feels strange but that is the impact of a Hall of Fame player and I am glad he is on our side,” Spoelstra said.Hassan Whiteside finished with 17 points and 13 rebounds for the Heat, while Kelly Olynyk chipped in 12 points and 11 rebounds. Goran Dragic had 10 points and 10 assists.The Heat have won six of their last eight games and hold a half-game lead over Orlando for the eighth and final spot in the Eastern Conference.ADVERTISEMENT Panelo: Duterte ‘angry’ with SEA Games hosting hassles Cayetano: Senate, Drilon to be blamed for SEA Games mess Knicks: Conclude their six-game homestand when they host the Chicago Bulls on Monday.Sports Related Videospowered by AdSparcRead Next UAAP volleyball: Lady Bulldogs eliminate Lady Falcons from Final 4 race Private companies step in to help SEA Games hosting Google Philippines names new country directorlast_img read more

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Is it Thiem’s time to win French Open? His coach thinks so

first_imgTrending Articles PLAY LIST 00:50Trending Articles00:50Trending Articles00:50Trending Articles02:42PH underwater hockey team aims to make waves in SEA Games01:44Philippines marks anniversary of massacre with calls for justice01:19Fire erupts in Barangay Tatalon in Quezon City01:07Trump talks impeachment while meeting NCAA athletes02:49World-class track facilities installed at NCC for SEA Games02:11Trump awards medals to Jon Voight, Alison Krauss While he dropped a set for the third straight match, Thiem showed more flashes of his dominant clay-court game in a 6-3, 4-6, 6-2, 7-5 win over Pablo Cuevas on Saturday to advance to the fourth round.“It was my best match so far,” Thiem said. “Not at all perfect yet, but the best so far.”FEATURED STORIESSPORTSPrivate companies step in to help SEA Games hostingSPORTSPalace wants Cayetano’s PHISGOC Foundation probed over corruption chargesSPORTSSingapore latest to raise issue on SEA Games food, logisticsFor a spot in the quarterfinals, Thiem will face Gael Monfils and likely a partisan crowd, too, against the French player.The other fourth-round matchups set Saturday: top-seeded Novak Djokovic vs. Jan-Lennard Struff; No. 5 Alexander Zverev vs. No. 9 Fabio Fognini; No. 8 Juan Martin del Potro vs. No. 10 Karen Khachanov; and No. 6 Stefanos Tsitsipas vs. No. 24 Stan Wawrinka, the 2015 champion. Tim Reed regains form to top Ironman 70.3 in Subic Private companies step in to help SEA Games hosting LATEST STORIES Massu understands the expectations surrounding his pupil.“It’s normal that they put the name of Dominic (as) one of the favorite players, because of the results that he had in the past,” Massu said.Thiem, however, is becoming quite comfortable in Paris, where he also reached the final of the boys’ tournament in 2011.“Eight years ago when I made the final of the juniors I fell in love with this tournament,” Thiem told the crowd after beating Cuevas.Then Thiem, who is dating French player Kristina Mladenovic, entertained the crowd inside Court Suzanne Lenglen with a few words in French, apologizing for his beginners’ grasp of the language.At 25, Thiem has plenty of time to learn.“When you are 25 years old you are not even in the (halfway point) of your career,” Massu said. “The good thing about Dominic (is) he has the time.”Already up to No. 4 in the rankings, Thiem sits behind only Djokovic and Nadal, who are both 32, and Roger Federer, who is 37.“He knows that he has the chance one day to be No. 1 in the world,” Massu said. “You never know when — maybe soon, maybe later — but he works for that.”A trophy in Paris would be a big step toward the top. Catholic schools seek legislated pay hike, too All top 10 men’s seeds are in the fourth round of a Grand Slam tournament for the first time since the 1970 Australian Open.When Massu looks at Thiem’s game it feels a bit like staring in the mirror. Massu used a similar style in winning gold medals in both singles and doubles at the 2004 Athens Olympics. There’s the big kick serve out wide, the heavy topspin, running around the backhand.“Many of the things that Dominic does today I was doing also, years before,” said Massu, who started working with Thiem this year. “Same ideas. So I understand what he wants.”Massu made an immediate impact on Thiem’s game when he guided him to his first Masters series title in Indian Wells, California, in March — which was surprising because until then Thiem’s best results had come on clay.Thiem reached the semifinals at the French in 2016 and 2017 before losing to Rafael Nadal in last year’s final. He also has four career wins at other tournaments over Nadal, the 11-time Roland Garros champion.ADVERTISEMENT MOST READ Two-day strike in Bicol fails to cripple transport Austria’s Dominic Thiem celebrates winning his third round match of the French Open tennis tournament against Uruguay’s Pablo Cuevas in four sets, 6-3, 4-6, 6-2, 7-5, at the Roland Garros stadium in Paris, Saturday, June 1, 2019. (AP Photo/Michel Euler)PARIS — Dominic Thiem wants one thing and one thing only right now: To go one step further than he did last year when he reached the final at Roland Garros.“Dominic has a chance to win the French Open for sure, one day,” his coach, Nicolas Massu, said in an interview. “I hope that this year it happens.”ADVERTISEMENT ‘Rebel attack’ no cause for concern-PNP, AFP DA eyes importing ‘galunggong’ anew Don’t miss out on the latest news and information. Sports Related Videospowered by AdSparcRead Next View comments Ethel Booba twits Mocha over 2 toilets in one cubicle at SEA Games venue Cayetano: Senate, Drilon to be blamed for SEA Games mess PDEA chief backs Robredo in revealing ‘discoveries’ on drug warlast_img read more

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Kane hails ‘world’s best’ Real Madrid

first_imgTransfers Kane ‘focused on Tottenham’ after draw with ‘world’s best’ Real Madrid Ben Hayward Last updated 2 years ago 20:35 10/18/17 FacebookTwitterRedditcopy Comments(3) Cristiano Ronaldo, Harry Kane, Real Madrid v Tottenham, Champions League 2017/18 Getty Images Transfers Real Madrid Real Madrid v Tottenham Hotspur Tottenham Hotspur UEFA Champions League Harry Kane The Spurs striker played down talk of a possible move to Spain and hopes his side can kick on in the Champions League after their 1-1 draw on Tuesday Harry Kane says he is “focused on Tottenham” and not thinking about a possible transfer to Real Madrid after he helped Mauricio Pochettino’s side secure a 1-1 draw at the Santiago Bernabeu on Tuesday night.The in-form forward was involved as Spurs took the lead in the Champions League clash in Madrid, his pressure on Raphael Varane forcing the France defender to put the ball past his own goalkeeper Keylor Navas. And after Cristiano Ronaldo had levelled from the penalty spot, Kane also missed a late chance to win the match as Navas pushed his shot around the post near the end.Kane 5/1 to be CL top scorer Article continues below Editors’ Picks Why Barcelona god Messi will never be worshipped in the same way in Argentina Lyon treble & England heartbreak: The full story behind Lucy Bronze’s dramatic 2019 Liverpool v Man City is now the league’s biggest rivalry and the bitterness is growing Megan Rapinoe: Born & brilliant in the U.S.A. The England striker had been heavily linked to Madrid in the build-up to the match, but when asked after the game in the mixed zone if he sees himself playing for Real one day, he simply said: “I’m focused on the season. I want to keep playing well for Tottenham.”HARRY KANE REAL MADRID TOTTENHAM CHAMPIONS LEAGUEOn the result, which leaves Spurs joint-top of Group H alongside Los Blancos with seven points, he said: “We came here and got a great result against a very good side and it leaves us in a great position for the rest of the Champions League group.”And he added: “There were chances at both ends. We could have nicked it in the end, but they are the best team in the world at the moment and we are very happy.”last_img read more

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Restoring and preserving Balboa Parks antique carousel

first_img May 18, 2018 Updated: 10:50 PM Sasha Foo, 00:00 00:00 spaceplay / pause qunload | stop ffullscreenshift + ←→slower / faster ↑↓volume mmute ←→seek  . seek to previous 12… 6 seek to 10%, 20% … 60% XColor SettingsAaAaAaAaTextBackgroundOpacity SettingsTextOpaqueSemi-TransparentBackgroundSemi-TransparentOpaqueTransparentFont SettingsSize||TypeSerif MonospaceSerifSans Serif MonospaceSans SerifCasualCursiveSmallCapsResetSave SettingsBALBOA PARK (KUSI) — For almost 100 years, it’s been one of the signature attractions at Balboa Park. Now, a local non-profit has launched a fundraising campaign to ensure that the historic carousel in the park will entertain many generations to come.When the Friends of Balboa Park arranged to buy the carousel from a private owner in San Diego last spring, it also decided to set a fundraising goal of $3 million to pay for the purchase and restoration of the 1910 Herschell — Spillman carousel.The antique carousel features more than 50 animals, including horses, a reindeer, giraffes, frogs, a dragon and pigs. There are probably fewer than a dozen of these antique menagerie carousels still operating worldwide which also allow riders to play a game called the “brass ring.”The carousel which came to California in 1912 became a permanent attraction at the park in 1922.Carousel manager Bill Brown told us the motor that powers the carousel is the original. Also original, the band organ that churns out sheet music with hit melodies from 1910.Although a schedule of regular maintenance and paint touch-ups have kept the carousel operating for almost a century, the executive director of the Friends of Balboa Park said it’s time for major restoration work.John Bolthouse said the group’s fundraising campaign will pay for improvements such as treating the building that houses the carousel for termite infestation, as well as installing new wiring and a sprinkler system.Some of the funds will also be spent on enhancing the appeal of the area around the carousel, As Bill Brown, the carousel manager told us, the only downside of the carousel occurs when the ride ends, “and the kids don’t want to go and it’s hard to get them off the carousel.”Looking ahead, the Friends of Balboa Park hopes the antique carousel with its fantastic menagerie of creatures won’t ever have to stop and can keep on riding into the future.If you would like to donate, click HERE. Posted: May 18, 2018center_img Restoring and preserving Balboa Park’s antique carousel Sasha Foo Categories: Local San Diego News FacebookTwitterlast_img read more

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Facebooks Latest News Feed Change Sounds Like Bad News for Publishers

first_img Turns out, Facebook would rather show you pictures of your sister’s kitten. Additionally, Mosseri’s blog featured what is undoubtedly a response to recent allegations that Facebook deliberately censored conservative viewpoints in its Trending Topics section. The announcement will surely be cause for concern among publishers, who are becoming increasingly reliant on Facebook as a distribution platform. It also highlights the inherent risks taken on by media companies when investing heavily in a platform whose mission may not be perfectly aligned with their own. Just today, Refinery29 announced that it is assembling a ten-person team devoted entirely to Facebook Live Video. The announcement arrives at a time when Facebook has become more of a content distribution platform than the social network Mark Zuckerberg launched from his Harvard dorm in 2004. Personal sharing is down, with users instead turning to platforms like Snapchat and Facebook-owned Instagram to connect with friends.  Presumably, most publishers were not posting content that was deliberately un-shareable, so it’s unclear who the real winners and losers will be as a result of the change. So why make the change? Facebook’s oft-repeated mantra is that it’s all about fostering relationships for its users. Over the years, however, the platform’s ubiquity — and an overwhelming market share that’s upended digital media and advertising as we know it — has led many to hail it as the next great news frontier, the antidote to diminishing ad revenue and a print industry in decline. When precisely the latest algorithm change — Facebook’s second in three months — will go into effect remains unclear.center_img “Facebook was built on the idea of connecting people with their friends and family. That is still the driving principle of News Feed today,” wrote VP of product management, Adam Mosseri, in a separate post. “Our top priority is keeping you connected to the people, places and things you want to be connected to — starting with the people you are friends with on Facebook.” The latest change to the social network’s News Feed algorithm, announced today, will boost posts shared by “friends” — individuals — at the expense of those shared by “pages” — publishers. “Overall, we anticipate that this update may cause reach and referral traffic to decline for some Pages,” wrote Lars Backstrom, Facebook’s engineering director, in a blog post. “We encourage Pages to post things that their audience are likely to share with their friends.” Only after completing that first step of connecting peers with one another, wrote Mosseri, is the News Feed expected to serve as a platform for informing and entertaining. Under the heading, “A Platform for All Ideas,” Mosseri wrote, “We are not in the business of picking which issues the world should read about. We are in the business of connecting people and ideas — and matching people with the stories they find most meaningful. Our integrity depends on being inclusive of all perspectives and view points, and using ranking to connect people with the stories and sources they find the most meaningful and engaging.” Facebook has been aggressively recruiting publishers for its new live video feature, so it’s unlikely that those posts will henceforth be buried by baby pictures. The same goes for Instant Articles, which Facebook says load up to ten times faster than external links and are now open to all publishers.last_img read more

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Plants live die according to their size

first_imgPlants self-regulate their populations to maintain stability and optimize their lives, with the lengths of their lives directly related to their mass, a recent study has found. Further, a single scaling power for lifespan holds true across the entire spectrum of plants, from single-celled phototrophs to giant redwoods. Citation: Plants live, die according to their size (2007, October 22) retrieved 18 August 2019 from https://phys.org/news/2007-10-die-size.html “Plant metabolism increases with increasing temperature, and, thus, plant life span and birth and mortality rates are expected to increase with temperature as well,” explained Marbà. “Hence, global warming may have consequences for the stability of plant populations. If temperature increases mortality and birth rates equally, plant populations will turn over faster but they would remain stable. Otherwise, plant populations will decline. In any case, a faster plant turnover, coupled with higher metabolic rates of decomposing microorganims with warming, may lead to a reduction in the CO2 sink capacity of vegetation.”Despite the delicate balance between mortality and birth rates, the actual mechanisms governing plant life and death are still unclear to biologists. Most certainly, controls include an assortment of metabolic processes interacting at all levels, from molecular to organismal, and include respiration, reproduction, cellular damage, and structural imbalances. Because plants, unlike animals, retain their reproductive capacity throughout their lives, evolution might put greater selective pressure on plants’ lifespans. The researchers plan to continue investigating how these processes combine to influence plant life histories. Citation: Marbà, Núria, Duarte, Carlos M., and Agustí, Susana. “Allometric scaling of plant life history.” Proceedings of the National Academy of Sciences, October 2, 2007, vol. 104, no. 40, 15777-15780.Copyright 2007 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. Mortality and birth rates are nearly identical for all plants, keeping their populations stable. Credit: Núria Marbà, et al. ©2007 PNAS. Scientists have long known that animals’ lifespans are closely scaled to the species’ body size, with elephants living longer than mice. But while plant biologists have predicted such a connection in plants, a full study has never been performed until now.Researchers Núria Marbà, Carlos Duarte and Susana Agustí at the Mediterranan Institute for Advanced Studies—a joint institute between the CSIC (Spanish Council for Scientific Research) and the University of the Balearic Islands in Esporles, Spain—have recently examined more than 1,000 reports of plant birth and mortality rates across a wide spectrum of species, discovering that the connection holds with extreme precision.The researchers found that both population mortality rates and population birth rates of all plant species scale as the –¼ power of plant mass. In other words, the smaller a plant, the higher its mortality and birth rates, meaning the shorter its lifespan. Hence, plant lifespan scales as almost exactly the ¼ power of plant mass. “The functioning of biological systems depends to a large extent on their metabolism, i.e., on how they process energy and materials, such as light, water, and nutrients,” Marbà explained to PhysOrg.com. “Small plants require fewer resources per unit of time than large ones, and, therefore, they are able to turn over the individuals of their populations faster than large plants. As plant size increases, more resources and time are needed to produce a fully grown individual, and thus their lifespan increases, resulting in small plants having shorter life spans than larger ones.”An interesting aspect of these relationships is that mortality and birth rates are nearly identical within a species, keeping the population extremely stable. Nature has additional reasons for this perfect balance, too, which include stabilizing carbon cycling, optimizing plant life histories, and stabilizing the ecosystems the plants inhabit. The scientists suggest that, to achieve this balance, plant mortality rates have evolved to match the birth rates.The group also investigated whether temperature entered the equation. According to the metabolic theory of ecology, metabolic rates (which determine lifespan) should be temperature-dependent. However, the researchers found that, unlike animals, plants’ mortality and birth rates are independent of temperature, or at least within the variation of their data. This finding contrasts with previous evidence that mortality rates of phytoplankton, macroalgae, and land plants increase with increasing temperature when the response of single species to temperature is examined. The researchers explain that resolving this issue could have a fundamental impact on predictions of global warming. center_img Live fast and die young, or play the long game? Scientists map 121 animal life cycles Explore further 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

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Researchers engineer molecular magnets to act as longlived qubits

first_img(PhysOrg.com) — Some physicists today are investigating the possibility of using molecular magnets as information storage units in future quantum computers. Molecular magnets are molecules whose magnetic moments prefer to lie along a particular axis with respect to the molecular structure. They have electron spin structures that can be magnetically tuned to more than one state and, at low temperatures, can retain this state even in the absence of a magnetic field, potentially allowing them to store information. More information: C.J. Wedge, et al. “Chemical Engineering of Molecular Qubits.” PRL 108, 107204 (2012). DOI: 10.1103/PhysRevLett.108.107204 Chemical structure of a molecular magnet. Image credit: C.J. Wedge, et al. ©2012 American Physical Society Copyright 2012 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. Citation: Researchers engineer molecular magnets to act as long-lived qubits (2012, March 21) retrieved 18 August 2019 from https://phys.org/news/2012-03-molecular-magnets-long-lived-qubits.html Explore further 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. Breakthrough in quantum computing: Resisting ‘quantum bug’ Now a team of researchers from the UK have demonstrated that the phase of quantum mechanical superpositions between the magnetic states can last for more than 15 microseconds, allowing their spin states to be repeatedly switched before they lose their information through decoherence. This finding adds to the evidence that molecular magnets may be useful as qubits, the components of a quantum computer.The researchers, C.J. Wedge, et al., from the University of Oxford and the University of Manchester, have published their study on how to chemically engineer molecular qubits to increase their phase memory times in a recent issue of Physical Review Letters. Previously, the researchers achieved a phase memory time of 3.8 microseconds, and studies of other molecular magnet systems have yielded times on the 1 microsecond time scale.  “Phase memory time and coherence time are very similar concepts,” coauthor Arzhang Ardavan of the University of Oxford told PhysOrg.com. “[Long phase memory time] means that it is possible to manipulate the qubit many times before the quantum information is lost. That is the greatest significance, but we were also pleased that it was possible to control the molecular structures precisely so as to determine the various decoherence mechanisms and to reduce them as far as we were able.”In their study, the researchers focused on Cr7Ni molecular magnets, which they had previously shown to have  coherence times that greatly exceed the 10 nanoseconds needed for single-qubit manipulations. Here, they have taken the next steps and investigated the specific sources of the molecular magnet’s decoherence (nuclear spin diffusion and spectral diffusion), as well as how to optimize the structures to delay decoherence as long as possible.To do this, the researchers compared different Cr7Ni structures by changing two key components, certain cations and ligands. They specifically investigated how well the different structures retained their spin states at low temperatures, as measured by the structures’ phase-coherence relaxation time. The researchers found that optimally engineered Cr7Ni molecular magnets can have phase memory times exceeding 15 microseconds, which is several orders of magnitude higher than the time required for single-qubit manipulations, and significantly longer than previous demonstrations.The researchers predict that the results will lead to the ability to manipulate quantum states within molecular magnet clusters. They plan to further investigate ways to manipulate molecular magnets in the future.“We will examine various possibilities,” Ardavan said. “Our collaborators who work on the chemistry of these molecules are able to synthesize structures incorporating several coupled molecular magnets. We will work on simple multi-qubit algorithms using these kinds of molecules. “Recently, it was proposed theoretically that electric fields could be used to manipulate the magnetic states of molecular magnets,” he added. “We are examining these possibilities experimentally.”last_img read more

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