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South Africa’s prisons go hi-tech

first_img22 August 2006South Africa has unveiled a high-tech national control centre that will monitor movements in prisons throughout the country via surveillance cameras, turnstile gates and metal detectors all linked through a state-of-the-art network.Developed by information technology firm Sondolo, the centre is part of an R88-million project to radically improve security in SA’s prisons.Officials manning the centre in Pretoria will be able to monitor “strategic access points” in prisons countrywide, and to communicate with officials at local level, alerting them to security breaches the moment they are detected.Details of inmates’ families and friends will also be logged into the system, making it easier to control prisoners’ access to the outside world.The process of beefing up security in SA’s prisons – to prevent escapes as well as weapon and drug smuggling – started in June 2005.Since then, over 1 500 cameras, 390 turnstile gates and hundreds of metal detectors have been installed in SA’s prisons, with more to come before the end of the year.Opening the national control centre on Monday, Correctional Services Minister Ngconde Balfour said “the game was over” for criminals who undermined security at prisons.Balfour said the government was considering installing the system in prison communal areas as well, to help combat violence among prisoners.SouthAfrica.info reporter and BuaNews Want to use this article in your publication or on your website?See: Using SAinfo materiallast_img read more

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Tynt and Creative Commons: Tracking Content for Good

first_imgAs well, Creative Commons’ Fred Benenson encourages members to consider using the tool. He says, “As a creator and contributor to the commons, you have the right to attribution (all six of our licenses require it), so why not make it easy for your audience to automatically provide it?”To test Tracer, members can register at Tynt. Read more: http://creativecommons.org/weblog/entry/16060#ixzz0MCiF2lSEUnder Creative Commons License: Attributionhttp://tracer.tynt.com/features-and-benefits-of-tracer#ixzz0MCg9SuUlUnder Creative Commons License: Attribution No Derivatives A Web Developer’s New Best Friend is the AI Wai… Related Posts dana oshiro Tags:#Publishing Services#web Top Reasons to Go With Managed WordPress Hosting Earlier this morning we reported on the AP’s new content tracking system and already we’re seeing the blogosphere light up with cries of nefarious intent. Nevertheless, just to prove that content tracking may not always be about serving DMCA take down notices, Creative Commons featured the Tynt Tracer tool in a morning blog post. Tynt Tracer is a few lines of JavaScript that automatically add license and attribution information to a user’s clipboard when they copy text. This method of attribution is not mandatory, nor is it really enforceable as re-posters can always remove the 3 lines of code. Nevertheless, this tool certainly makes attribution convenient. As an additional plus, Tracer adds, “Our data shows that those pages that users engage with most are not necessarily those with the most page views.” With Tracer, publishers can find out their most sought after information and increase the relevancy of their resources to readers. Creative Commons is already using Tracer to see what readers are highlighting, copying and redistributing. 8 Best WordPress Hosting Solutions on the Market Why Tech Companies Need Simpler Terms of Servic…last_img read more

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Strict vigil as normalcy returns to Baduria

first_imgLife in West Bengal’s Baduria and surrounding areas, where communal clashes broke out over a Facebook post, returned to normal on July 6, 2017 with no fresh incidents of violence, a senior official said. Shops and markets reopened, bus services resumed and locals started coming out of their homes. However, internet services continued to be disrupted and paramilitary forces and police remained posted in the troubled area.“Everything is back to normal. There has been no report of any problem from anywhere in Baduria and its adjoining areas in Basirhat in North 24 Parganas district,” a senior official of the state home department told PTI. “We are keeping strict vigil so that nothing untoward happens here. Till then police postings here will continue,” he said.Baduria and its adjoining areas, including Keosha market, Banshtala, Ramchandrapur and Tentulia, witnessed a communal flare-up following a post by a youth on Facebook earlier this week. Though the youth was arrested, members of two communities clashed, set up road blockades, damaged shops and set fire to vehicles.To control the situation, the State government had to temporarily suspend internet services in the four police station areas of Basirhat, Baduria, Swarupnagar and Deganga to check the spread of rumours through social networking sites.Asked about when internet services would resume, the official said, “A thorough review of the situation will be done before a decision is taken in this matter.” Chief Minister Mamata Banerjee had said on July 5, 2017 that the situation in Baduria was “under control”. The clashes had triggered an unprecedented spat between her and Governor K N Tripathi, whom she accused of acting like “a BJP block president” and “threatening” her.DGP Surajit Kar Purakayasta has requested people to refrain from spreading hatred. “Those spreading rumours and indulging in hate posts and false propaganda shall not be spared. Please respect the law of the land. Malicious efforts to create divides and attempts to take law in own hands will be sternly dealt with. Please don’t heed rumours,” Purakayasta said.last_img read more

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Telangana militant killed in J&K had been counselled by police

first_imgMohammad Taufeeq (26), a Telangana resident who was killed along with two other suspected terrorists in Anantnag district of Jammu and Kashmir earlier this week, was counselled on several occasions by the State police. Taufeeq from Aswapuram in Bhadradri-Kothagudem district in Telangana went missing from the police radar about two-and-half-months ago, a senior Home Ministry official said.It is the first such case, at least in a decade, of a non-Kashmiri being killed in a police encounter in Kashmir Valley, the official said. The Telangana police have a counter-radicalisation policy by which persons inclined towards radical ideology are counselled with the help of experts and family members. Such persons are kept under surveillance. The official said the J&K police are investigating how Taufeeq reached the Kashmir Valley. “We are investigating how he got in touch with the militants, whether it was through social media or some other medium,” J&K DGP S.P. Vaid said.The other two militants who were killed with Taufeeq were identified as Eisa Fazli, a resident of Soura on the outskirts of Srinagar and Syed Owais Shafi of Anantnag.Social media accounts affiliated to both Islamic State and Ansar Ghazwat-ul Hind (AGuT) backed by Al-Qaeda, claimed the three militants belonged to their outfits.An analysis of the social media posts revealed there was a scramble among the two outfits to claim that the militants were their members.On March 14, a day after the three were killed in an encounter, AGuT released the first ever issue of Al-Nasr, a propaganda pamphlet, describing them as “martyrs.” “Responding to the call of martyrdom, Mohammad Taufeeq started his jihadi journey in 2017 after making hijrah from India’s Hyderabad city to the mountains of Kashmir and was among the first in the ranks of Ansar Ghazwatul Hind,” the social media post said. It also carried a picture of Taufeeq with Mohammad Rehan, the latter identified as deputy Ameer (head) of the AGuT.Hours later, Islamic State Khorasan Province (ISKP), active in Afghanistan, released a statement that they were the soldiers of the IS. “The three soldiers of IS fulfilled their promise of martyrdom in Kashmir. We are proud of these martyrs’ character because they in a region, where India and Pakistan are playing a murky game,” the IS message said. Till last month, the J&K police claimed it was Fazli, who was pushing messages on media of the IS claiming two attacks in the Valley.“Since both outfits are claiming the militants to be their members, there seems to be a competition between the two. It is not good for the Kashmir Valley. Whether it’s Al-Qaeda or transnational jihadi organisations, they have destroyed half of the world. It will not be good for Kashmir,” said Mr. Vaid.last_img read more

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PVL goes to Tuguegarao, Bacolod, Iloilo

first_imgDon’t miss out on the latest news and information. Fire hits houses in Mandaluyong City PH women’s volleyball team motivated to deliver in front of hometown crowd PLAY LIST 02:25PH women’s volleyball team motivated to deliver in front of hometown crowd00:59Sports venues to be ready in time for SEA Games01:27Filipino athletes get grand send-off ahead of SEA Games01:37Protesters burn down Iran consulate in Najaf01:47Panelo casts doubts on Robredo’s drug war ‘discoveries’01:29Police teams find crossbows, bows in HK university01:35Panelo suggests discounted SEA Games tickets for students02:49Robredo: True leaders perform well despite having ‘uninspiring’ boss02:42PH underwater hockey team aims to make waves in SEA Games Malaysia bans travel to North Korea, football match postponed Read Next View comments LOOK: Loisa Andalio, Ronnie Alonte unwind in Amanpulo for 3rd anniversary BSP sees higher prices in November, but expects stronger peso, low rice costs to put up fight LATEST STORIES “We just want to go straight to our fans in the provinces and show our appreciation to them for supporting the PVL through the years,” said Sports Vision president Ricky Palou.The PVL will also make stops in Bacolod City and Iloilo on Oct. 17 and Oct. 18, respectively. No schedule of games for that leg has been released. FEATURED STORIESSPORTSWATCH: Drones light up sky in final leg of SEA Games torch runSPORTSSEA Games: Philippines picks up 1st win in men’s water poloSPORTSMalditas save PH from shutoutBatangas is also being eyed as a venue for future matches. Frontrow holds fun run to raise funds for young cancer patients  The Premier Volleyball League is scheduled to play exhibition games in three cities outside of the capital in October in an attempt to grow the brand outside of Metro Manila.Tuguegarao will be the first out-of-town host on Oct. 7 when San Sebastian takes on BanKo-Perlas at People’s Gym at 3:30 pm with the game between three-time champion Pocari Sweat and Creamline happening at 5:30 pm.ADVERTISEMENT MOST READ Nonong Araneta re-elected as PFF president Typhoon Kammuri accelerates, gains strength en route to PH Brace for potentially devastating typhoon approaching PH – NDRRMC Fire hits houses in Mandaluyong Citylast_img read more

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Cavs’ Dwyane Wade sidelined with bruised knee

first_imgStronger peso trims PH debt value to P7.9 trillion Don’t miss out on the latest news and information. Read Next CPP denies ‘Ka Diego’ arrest caused ‘mass panic’ among S. Tagalog NPA QC cops nab robbery gang leader, cohort Duterte has only scratches on elbow, knee after motorcycle accident — Go PLAY LIST 01:46Duterte has only scratches on elbow, knee after motorcycle accident — Go01:33US Representatives react to Trump impeachment inquiry00:51Clarkson on being PH flag-bearer: One of the happiest moments in my career01:37Protesters burn down Iran consulate in Najaf01:47Panelo casts doubts on Robredo’s drug war ‘discoveries’01:29Police teams find crossbows, bows in HK university01:35Panelo suggests discounted SEA Games tickets for students02:49Robredo: True leaders perform well despite having ‘uninspiring’ boss02:42PH underwater hockey team aims to make waves in SEA Games Brace for potentially devastating typhoon approaching PH – NDRRMC View comments Japan ex-PM Nakasone who boosted ties with US dies at 101 Gritty Bolts force Game 7 LATEST STORIES MOST READ Cleveland Cavaliers’ Dwyane Wade, center, drives to the basket between Orlando Magic’s Terrence Ross, left, and Evan Fournier, from France, in the first half of an NBA basketball game, Saturday, Oct. 21, 2017, in Cleveland. (AP Photo/Tony Dejak)NEW YORK — Cleveland Cavaliers forward Dwyane Wade has a bruised left knee and won’t play Wednesday night against the Brooklyn Nets.Wade came off the bench and scored 11 points in 19 minutes in Tuesday’s win over the Bulls. It was Wade’s first game with Cleveland’s second unit, and the 35-year-old added four assists and three rebounds as theCavs’ reserves cut into Chicago’s early 14-point lead.ADVERTISEMENT Coach Tyronn Lue said he didn’t know Wade had banged knees during the game, saying it was just a freak accident and that the knee had swelled up on the flight to New York.Earlier this week, Wade asked Lue to take him out of the starting lineup because he thought it would benefit the team. Lue has been juggling his lineups and rotations while trying to blend new players and deal with injuries.FEATURED STORIESSPORTSWATCH: Drones light up sky in final leg of SEA Games torch runSPORTSSEA Games: Philippines picks up 1st win in men’s water poloSPORTSMalditas save PH from shutoutStarting point guard Derrick Rose was out for the third straight game with a sprained ankle, with Lue saying he hoped Rose could return Saturday. LeBron James made a rare start at point guard and scored 34 points with 13 assists as the Cavs improved to 3-1. James also tweaked his right ankle.Nets guard D’Angelo Russell was out with a right knee sprain. Coach Kenny Atkinson said the injury wasn’t serious and that the team was being cautious with its 22-year-old leading scorer. Typhoon Kammuri accelerates, gains strength en route to PH Kammuri turning to super typhoon less likely but possible — Pagasa Kin of Misamis Oriental hero cop to get death benefits, award — PNPlast_img read more

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Two Quebecers remain detained on terrorismrelated charges

first_imgMONTREAL – Two young Quebecers who are facing terrorism-related charges will remain behind bars pending their next court appearance in July.El Mahdi Jamali, 20, and Sabrine Djermane, 21, were handcuffed as they appeared in a Montreal courtroom today.They were arrested in April 2015 and denied bail soon after.The two were students at the time at College de Maisonneuve, a Montreal junior college, and the Crown called their arrests a “preventive measure.”Jamali and Djermane each face four charges: attempting to leave Canada to commit a terror act abroad; possession of an explosive substance; facilitating a terrorist act; and committing an act under the direction or for the profit of a terrorist organization.They are seeking two separate trials: one on the charge of attempting to leave Canada to commit a terror act abroad and another on the three other counts.last_img read more

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ELC Student Charity Golf Tournament raises close to 5000 for Hospital Foundation

first_imgELC Vice-Principal, Lori Coulter, says community-based projects, such as the golf tournament, bring awareness to the students and allows them to discover how they can make an impact in their own neighbourhood.The Golf Tournament included 18 holes of golf, a golf cart, and a steak dinner. Over 40 golfers and 60 plus dinner guests were in attendance for the event. FORT ST. JOHN, B.C. – During the summer, four grade 10 students from the Energetic Learning Centre held a charity golf tournament fundraiser.As part of a Project-Based Learning Program, Colton Dyck, Jenna Miranda, Timber Wuthrich, and Mackenzie Gordon were able to raise almost $5,000 in support of the Fort St. John Hospital Eastern-Star Children’s Fund.With that money, the Hospital will be able to purchase new equipment for the maternity ward.last_img read more

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McAllister remains undefeated behind Clippers 52 victory

Columbus Clippers pitcher Zach McAllister came out with an undefeated record on the mound. As of Monday night, that still has not changed after Columbus defeated the Charlotte Knights, 5-2. McAllister faced 27 batters in the seven innings he pitched, giving up just five hits, two runs. He threw 102 pitches, an impressive 71 of them strikes. “It’s one thing where I got into a little groove and was able to carry it,” McAllister said. “I think that’s kind of big for me, having that good feeling on the mound and taking advantage of it when I can.” McAllister is now 6-0 on the season. McAllister was drafted in 2006 out of Illinois Valley Central High School by the New York Yankees. The Cleveland Indians acquired McAllister in August 2010. The learning curve has been a little harder for him coming straight out of high school, but he has handled it with grace. “I had some success early in my career at the lower levels, then this past year was a little rough for me, statistics-wise,” McAllister said. “I think that one of the best things to happen to me was to grow from the struggle.” The 6’6″ right-hander impresses his colleagues. “He keeps making strides each outing,” Clippers manager Mike Sarbaugh said. “His slider was really good, he did a good job of getting us off the field quick, and those are good nights when you are a pitcher.” Columbus jumped out to a 2-0 lead in the first inning. First baseman Travis Buck’s RBI single brought in center fielder Ezequiel Carrera, giving the Clippers a 1-0 lead. Columbus put another on the board when designated hitter Cord Phelps’ sacrifice fly brought in shortstop Jason Donald. A Buck pop-out put Columbus up 3-0 in the third inning, shortly followed by Donald’s solo shot in the fifth, making it 4-0. Charlotte cut the score to 4-1 in the sixth inning when shortstop Eduardo Escobar’s double brought in second baseman Gookie Dawkins. Center fielder Jordan Danks put the only damper on the night for McAllister when he crunched a solo homerun in the seventh inning, making it 4-2. McAllister was still not be phased, as he ended the inning striking out Escobar. Columbus put their final run on the board in the eighth inning, making it 5-3. McAllister is already looking forward to improving more. “I just got to go out and take every day like it’s your last one out here,” he said. “Today was a great day for me, and I am happy, but the next one is the one that matters for me.” Columbus is now 24-7 on the year. Charlotte dropped to 12-18. They will continue their four-game-series against Charlotte tomorrow night at Huntington Park at 6:35 p.m. read more

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Ferdinand slammed Jones for his penalty tackle

first_imgChelsea won the FA Cup final against Manchester United 1-0 thanks to Eden Hazard’s converted penalty and this decisive moment of the game was caused by silly Phil Jones’ challenge in the penalty box.Rio Ferdinand believes that the decision of Phil Jones was completely wrong and he misread the whole situation in the penalty area as he tackled Eden Hazard way too late – and this was the moment that decided the whole game.The former United centre-back spoke about the penalty situation as he said, according to 101 Great Goals:“Jones gets himself in a pickle from start to finish.”“Here his body position is all wrong, he’s the wrong side in terms of facing the opponent.”harry maguire, manchester UnitedMaguire says United need to build on today’s win George Patchias – September 14, 2019 Harry Maguire wants his United teammates to build on the victory over Leicester City.During the summer, Harry Maguire was referred to as the ultimate…“He doesn’t know where Eden Hazard is, that’s his biggest problem.”“Then once he reacts the touch is that good and he’s that quick, and at this world-class level he’s panicking, he’s in turmoil.”“But here, once he releases he can’t win the ball there, turn and face your goal.”“Run towards your goal. Don’t gamble that you’re going to nick it in front of Hazard, he’s too quickly.”“Run towards goal and make the recovery and be in-between the goal and the ball.”last_img read more

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Di Maria Mbappe will certainly win the Ballon dOr

first_imgThe “phenomenon” Kylian Mbappe will only get better and will certainly win the Ballon d’Or during his career, says Paris Saint-Germain team-mate Angel Di MariaAt just 20 years of age, Mbappe has already achieved things in his short career that most footballers can only dream about after tasting a great deal of domestic success and winning the World Cup with France last summer.The forward’s exploits saw him win the inaugural Trophee Kopa for the world’s best U-21 player along with finishing fourth in the 2018 Ballon d’Or poll.And Mbappe looks set to possibly go on to achieve even higher standards this season with the Frenchman leading the Ligue 1 scoring charts with 14 goals in 13 games for PSG.Opinion: Neymar needs to apologize to PSG’s supporters Tomás Pavel Ibarra Meda – September 14, 2019 After such a dramatic summer during the transfer window, Neymar truly needs to apologize to all the PSG supporters this weekend.When Neymar finished last…“Kylian is a phenomenon,” Di Maria told France Bleu.“Since his exit from Monaco he has grown a lot as a player and produced an extraordinary World Cup.“If he continues like this, surrounded by team-mates with great potential, he will evolve further and will certainly win the Ballon d’Or.”Mbappe, who found the net in PSG’s 3-0 win over Amiens last weekend, will be looking to continue his strong form for Saturday’s Ligue 1 match against Guingamp.last_img read more

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Shavez Musgrove captured

first_imgFacebook Twitter Google+LinkedInPinterestWhatsApp Facebook Twitter Google+LinkedInPinterestWhatsAppTurks and Caicos, April 5, 2017 – Providenciales – Around 10 am today (Tuesday 4th April 2017), Detectives and Tactical Unit Officers of the Royal Turks and Caicos Islands Police Force captured wanted suspect  27 year old Shavez Musgrove of Providenciales.Officers executed a Search Warrant at a home located Off Malcolm’s Road in Wheeland for stolen goods and during the search Mr. Musgrove was captured without incident. He was wanted as a suspect for a number of serious offences that occurred on Providenciales.A 17 year old female who was also found in the home is assisting police with investigations.Press Release: RTCIPF#ShavezMusgrovecaptured Related Items:#ShavezMusgrovecapturedlast_img read more

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Nations Restaurant News Could Be First of Many Deals for Penton

first_imgPenton Media’s purchase of Lebhar-Friedman flagship Nation’s Restaurant News could be the start of several new acquisitions, according to Penton CEO Sharon Rowlands [pictured]. “After our restructuring, we did a strategic review of our portfolio looking at where we’d like to invest to build scale,” she told FOLIO. “Restaurants were an area that had a tough couple of years, but we think their prospects will improve going forward. We are fortunate that as we started looking to do deals, this asset came on the market.”Rowlands says Penton is looking for print, event, digital and data assets across a variety of markets and is looking to build up its Asian business, particularly products serving China. “More horizontally, we’re investing in areas such as marketing services-we’re building that out organically but we also want to make acquisitions to speed up the process,” she says. Nation’s Restaurant News, which serves the mass-market restaurant business, joins the Penton Restaurant Group, which also includes Restaurant Hospitality, which covers the more boutique markets, and Food Management, which covers in-service restaurants serving institutions such as hospitals and college. While Rowlands wouldn’t reveal combined revenue of the new group, she says it is close to being one of Penton’s “top 10 groups.” Some observers have said that NRN, which cut frequency in recent years from 51 to 26, has lost nearly 20,000 subscribers since 2004 as well as 40 percent of its ad base, but Rowlands says she’s pleased with the condition of the brand, particularly on the digital side. “In the last six months NRN has seen strong improvement in the core print business while the digital business is growing strongly,” she says.last_img read more

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10 Things To Know For Wednesday

first_img Share AP Photo/Eugene HoshikoU.S. Vice President Mike Pence, front, waves to U.S. servicemen and Japanese Self-Defense Forces personnel on the flight deck of U.S. navy nuclear-powered aircraft carrier USS Ronald Reagan, at the U.S. Navy’s Yokosuka base in Yokosuka, south of Tokyo, Wednesday, April 19, 2017.1. GEORGIA HOUSE SEAT STILL UNDECIDEDA June 20 runoff between Democrat Jon Ossoff and Republican Karen Handel is an early barometer for Trump and both parties ahead of the 2018 midterm elections.2. ‘THE SHIELD STANDS GUARD AND THE SWORD STANDS READY’From the deck of a massive aircraft carrier off Tokyo, Vice President Mike Pence warns North Korea not to test the resolve of the U.S. military.3. TRUMP SHAKING UP STATUS-QUO IN NORTH ASIAIn trying to get North Korea to abandon its nuclear weapons and ballistic missile programs, Pyongyang sees more volatility, China calls for calm and Japan weighs a retaliatory capability.4. WHAT MAY HAVE MOTIVATED FRESNO SHOOTERBefore he shot to death three people at random, Kori Ali Muhammad, a 34-year-old black man, told police he wanted to kill as many white people as he could before he was captured.5. MANHUNT ENDS IN UNLIKELY FASHIONFacebook slaying suspect Steve Stephens was undone when a worker at a McDonald’s near Erie, Pennsylvania, recognized him at the drive-thru window.6. WHERE TRUMP SUPPORT IS STRONGResidents of Androscoggin County, Maine, backed a Republican for president for the first time in decades because many support his views on immigration, AP finds, even though the town has been bolstered by immigrants.7. AP: PERU BACKSLIDING ON ILLEGAL LOGGINGThe 2015 impoundment of a freighter in Houston carrying tons of Amazon rainforest wood represents a rare victory in the battle to preserve tropical forests.8. HOW NAVY IS ADDRESSING FEMALE SAILORSDefense contractor Electric Boat is designing what will be the first U.S. fleet of Navy submarines built specifically to accommodate female crew members.9. NO SPINNING THIS ONEViewership of Fox News Channel’s “O’Reilly Factor” drops without its vacationing and scandal-riddled host, Bill O’Reilly.10. WHO’S WONDERING WHETHER HE’LL ‘GET THAT ITCH AGAIN’Michael Phelps hasn’t gotten the urge to return to swimming, but the winningest athlete in Olympic history hasn’t ruled out yet another comeback.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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