Tiny tweezers

first_img As quantum science and engineering come into their own, co-directors of new initiative say anything is possible Related Electrons, up really close Team makes most precise measure ever of their charge For most people, tweezers are a thing you’d find in a medicine cabinet or beauty salon, useful for getting rid of ingrown hairs or sculpting eyebrows.Those designed by John Doyle and Kang-Kuen Ni have more exotic applications.Using precisely focused lasers that act as “optical tweezers,” the pair have been able to capture and control individual, ultracold molecules — the eventual building-blocks of a quantum computer — and study the collisions between molecules in more detail than ever before. The work is described in a paper published in Science on Sept. 13.“We’re interested in doing two things,” said Doyle, the Henry B. Silsbee Professor of Physics and co-director of the Quantum Science and Engineering Initiative. “One is building up complex quantum systems, which are interesting because it turns out that if you can put together certain kinds of quantum systems they can solve problems that can’t be solved using a classical computer, including understanding advanced materials and perhaps designing new materials, or even looking at problems we haven’t thought of yet, because we haven’t had the tools.“The other is to actually hold these molecules so we can study the molecules themselves to get insight into their structure and the interactions between molecules,” he continued. “We can also use them to look for new particles beyond the Standard Model, perhaps explaining key cosmological questions.”Ni, the Morris Kahn Associate Professor of Chemistry and Chemical Biology, explained that the work began with a cloud of molecules — in this case calcium monofluoride molecules — trapped in a small chamber. Using lasers, the team cooled the molecules to just above absolute zero, then used optical tweezers to capture them.,“Because the molecules are very cold, they have very low kinetic energy,” Ni said. “An optical tweezer is a very tightly focused laser beam, but the molecules see it as a well, and as they move into the tweezer, they continue to be cooled and lose energy to fall to the bottom of the tweezer trap.”Using five beams, Ni, Doyle, and colleagues were able to hold five separate molecules in the tweezers, and demonstrate exacting control over them.“The challenge for molecules, and the reason we haven’t done it before, is because they have a number of degrees of freedom — they have electronic and spin states, they have vibration, they have rotation, with each molecule having its own features,” she said. “In principle, one could choose the perfect molecule for a particular use — you can say I want to use this property for one thing, and another property for something else. But the molecules, whatever they are, have to be controlled in the first place. The novelty of this work is in being able to have that individual control.”While capturing individual molecules in optical tweezers is a key part of potentially building what Doyle called a “quantum simulator,” the work also allowed researchers to closely observe a process that has remained largely mysterious: the collision between molecules.“Simple physics questions deserve answers,” Doyle said. “And a simple physics question here is, what happens when two molecules hit each other? Do they form a reaction? Do they bounce off each other? In this ultracold, quantum region … we don’t know much.“There are a number of very good theorists who are working hard to understand if quantum mechanics can predict what we’re going to see,” he continued. “But, of course, nothing motivates new theory like new experiments, and now we have some very nice experimental data.”In subsequent experiments, Ni said the team is using the optical tweezers to “steer” molecules together and study the resulting collisions.In separate experiments, researchers from her lab explore reactions of ultracold molecules. “We are studying these reactions at ultracold temperatures, which haven’t been achieved previously,” she said. “And we’re seeing new things.” Harvard’s quantum leapcenter_img Two atoms combined in dipolar molecule Achievement could lead to more-efficient quantum computing Ni was also the author of a 2018 study that theorized how captured molecules, if brought close enough together, might interact, potentially enabling researchers to use them to perform quantum calculations.“The idea of Kang-Kuen’s paper is that we can bring these single molecules together and couple them, which is equivalent to a quantum gate, and do some processing,” Doyle said. “So that coupling could be used to perform quantum processing.”The current study is also noteworthy for its collaborative nature, Doyle said.“We talk a lot about collaboration in the Harvard Quantum Initiative and the Center for Ultracold Atoms (CUA), and the bottom line is this collaboration was driven by scientific interest, and included Wolfgang Ketterle at MIT, one of our CUA colleagues” he said. “We all have strong scientific interest in molecules, and the fact that Kang-Kuen’s lab is in chemistry and my lab is here in physics has not been a significant barrier.“It has been absolutely fabulous working together to solve these problems. And one of the big reasons why is when you have two faculty members from two different departments, they’re not only bringing their personal scientific perspective, they’re bringing to some degree, all the knowledge from their groups together.”This research was supported with funding from the National Science Foundation. The Daily Gazette Sign up for daily emails to get the latest Harvard news.last_img read more

Smart tourism as a guiding thread for the success of Croatian tourism

first_imgThe participants pointed out that the public is not sufficiently aware of the importance of cooperation and that they believe that the responsibility for the development of smart community management is primarily the responsibility of tourist boards, and then other stakeholders.  The panel discussion brought together about two hundred participants, mostly key representatives of leading tourism companies, institutions and potential SMART destinations, who worked together to answer the question. “What will tourism be like in Croatia after the crown?”.  I am glad to see today that Croatian tourism is on a great track to become “smart”, but we are also convinced that Croatia needs to work further on a legislative framework that will support the goals of various strategic frameworks that are to some extent good. developed. It is also necessary to further encourage interdisciplinary cooperation and develop participatory platforms that include a wide range of levels of management and stakeholders in tourism management and strategic development thinking. ” pointed out the director of the tourism sector from the partner company in the organization of this event, Jadranka Gojtanić “Tourism in Croatia is expecting key years of development and I believe that they will be marked by activities related to smart tourism and the SMARTMED project in which Croatia, through the Ministry of Tourism and Sports, has a leading role among nine Mediterranean countries.. “, said the state secretary at the ministry of tourism and sports Tonči Glavina he added: “Today’s four panel discussions of domestic experts in tourism on the topics of smart tourism, ie sustainability, cooperation and participation, human capital and business environment, and technology and IT reminded us of some great “smart” projects that have been implemented in Croatia for a long time. encourage reflection on innovative tourism models and the potential of the pilot project in Croatia and the possibilities of international cooperation with Mediterranean countries. I am glad that projects such as the digitalization of Croatian tourism, the award-winning eVisitor check-in and check-out system, the croatia.hr and entercroatia portals, which aim to introduce visitors to current events in our country, the Safe Tourist Season project and many others by the Ministry of Tourism and sports launched independently or in collaboration with partners and the community and others that we strongly support, recognized and members of this initiative and highlighted as excellent examples of sustainability in the research conducted.” In the panel Human Capital and Business Environment, the emphasis is placed on the necessity of encouraging and developing creative entrepreneurship, encouraging year-round employment and continuous development of competencies of actors in tourism in accordance with market changes. Through the conversation of the participants, it was pointed out that the Croatian islands, with an emphasis on Krk and Cres, turned to sustainability and previously prescribed strategies at the level of Croatia and Europe, presented projects by which Dubrovnik fights against over- tourism,  storytelling as a key element of sustainability and heritage preservation in Croatia and how currently accessibility in tourism, social and inclusive tourism is a marginally addressed topic that has much room for development. As a basic key to sustainable tourism, the emphasis is on cooperation, which was also the topic of the second panel of this event.   The panel dedicated to cooperation and participation highlighted the necessary greater connection between the field and decision makers, as exemplified by the Island Movement, which used technology to connect islands and emphasized the importance of the local community in tourism management. The Municipality of Svetvinčenat is an excellent example of this. The direction in which Croatia is going is answered in four panels in which it was pointed out that Croatia is at the forefront of sustainability and that for the development of smart tourism it is necessary to encourage the private sector and promote the cooperation of the population through the cooperation of the four pillars of smart tourism.  Smart tourism should primarily foster an interdisciplinary, intersectoral and participatory approach to governance and develop destinations that are inclusive and resilient, whose local communities live better lives and promote their heritage, and where tourists and visitors preserve the environment together with the population.  Through the panel discussion, the goal was to identify key areas in which it is necessary to invest for the development of smart tourism in Croatia. The discussion with panelists and the audience showed that in Croatia there is great interest in new models of tourism development and integration of new technologies in the form of innovative products, destination resilience, inclusive tourism, etc. and the direction of further tourism development from the point of view of key Croatian tourism stakeholders. Croatian tourism is at the forefront of sustainability, and the emphasis must be on strategic consideration of development and interdisciplinary cooperation of stakeholders in tourism was one of the conclusions of the all-day online panel discussion “Challenges and opportunities for smart tourism development in Croatia” organized by the Ministry of Tourism and Sports. consulting Apsolon. The first panel on sustainability in tourism pointed out that sustainability is a complex topic that, in addition to the first environmental protection, contains a much wider range of topics that need to more clearly define guidelines, further educate local tourism actors on what to do and introduce technologies to ultimately the development of sustainability would encourage the private sector and stronger cooperation of the population. Panelists at the Technology and IT Panel led a discussion on the benefits of technologies for tourism, the role of strategies in fostering innovation while emphasizing that strategies come in a relatively short period of time.last_img read more

Djokovic, Williams through at Wimbledon

first_imgWorld number one Novak Djokovic condemned the United States to their worst Wimbledon men’s performance in over a century yesterday as Serena Williams set up a clash of senior citizens against Kimiko Date-Krumm.Top seed Djokovic breezed past world number 156 Bobby Reynolds, a 30-year-old qualifier, 7-6 (7/2), 6-3, 6-1 to reach the third round.Reynolds was the last American man standing and his defeat under the Centre Court roof means that the for the first time since 1912 there will not be a male player from his country in the third round.Djokovic, the 2011 champion, goes on to face either Jeremy Chardy, the French 28th seed, or German qualifier Jan-Lennard Struff.Their match was one of eight left uncompleted as heavy rain brought the first delays of the week.Djokovic admitted he had been wary of Reynolds after Roger Federer and Rafael Nadal had both been shocked by opponents outside the top 100.Reynolds, the last of 11 US men who started in the main draw on Monday, believes the American decline is only temporary.“There are young college players, but I think they have a lot of potential. Maybe, just a couple years hopefully a good one’s coming,” he said.Defending women’s champion Williams and Date-Krumm, two players with a combined age of 73, set up an intriguing clash for a last 16 place. Top seed Williams extended her winning streak to 33 matches, just two behind the record set by sister Venus in 2000, with a 6-3, 6-2 win over French 19-year-old Caroline Garcia, who she also beat at the French Open.Williams, 31, chasing a sixth Wimbledon title and 17th major, wrapped up victory, the 599th of her career, in 67 minutes with 30 winners and nine aces.Date-Krumm, 42, reached the third round, 17 years after she last did so at Wimbledon, with a 6-4, 7-5 win over Romania’s Alexandra Cadantu, 19 years the Japanese’s junior, to become the oldest woman to make the last 32 at the All England Club.The previous oldest player was Britain’s Virginia Wade, who was 39 years and 362 days old when she made the same stage in 1985.Despite their many years on tour, Williams and Date-Krumm have never played each other.Date-Krumm made the semi-finals in 1996 where she lost to Steffi Graf before taking what turned out to be a 12-year break from tennis.After the shock-waves of Wednesday, which saw Federer and Maria Sharapova knocked out, the number of second round injury pull-outs reached a tournament record nine. French players Michael Llodra (hamstring) and Paul-Henri Mathieu (neck) were the latest to give up although Llodra attracted criticism when he continued to play doubles.LONDON, England — Novak Djokovic of Serbia plays a return to Bobby Reynolds of the United States during their Men’s second round singles match at the All England Lawn Tennis Championships in Wimbledon here, yesterday.last_img read more