{"id":11178,"date":"2011-07-21T09:10:00","date_gmt":"2011-07-21T16:10:00","guid":{"rendered":"https:\/\/dornsife.usc.edu\/news\/stories\/usc-scientists-contribute-to-a-breakthrough-in-quantum-computing\/"},"modified":"2023-04-19T11:21:11","modified_gmt":"2023-04-19T18:21:11","slug":"usc-scientists-contribute-to-a-breakthrough-in-quantum-computing","status":"publish","type":"post","link":"https:\/\/dornsife.usc.edu\/news\/stories\/usc-scientists-contribute-to-a-breakthrough-in-quantum-computing\/","title":{"rendered":"USC Scientists Contribute to a Breakthrough in Quantum Computing"},"content":{"rendered":"\n\n\n    \n            \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-hero \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-hero\"\n    \n      >\n\n    \n<div class=\"inner-wrapper\">\n  \n  \n  <div class=\"text-wrapper\">\n          <nav aria-label=\"Breadcrumb\" class=\"breadcrumbs\">\n        <ul>\n                      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class=\"a2a_label visually-hidden\">Email<\/span>\n          <\/a>\n                  <\/span>\n  <\/div>\n\n  <\/div><\/div>\n  \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <p>Scientists have taken the next major step toward quantum computing,  which will use quantum mechanics to revolutionize the way information is  processed.<\/p>\n<p>Quantum computers will capitalize on the mind-bending properties of  quantum particles to perform complex calculations that are impossible  for today&rsquo;s traditional computers.<\/p>\n<p>Using high-magnetic fields, Susumu Takahashi, assistant professor of chemistry in USC Dornsife, and his  colleagues managed to suppress decoherence, one of the key stumbling  blocks in quantum computing.<\/p>\n<p>&ldquo;High-magnetic fields reduce the level of the noises in the  surroundings so they can constrain the decoherence very efficiently,&rdquo;  Takahashi said. Decoherence has been described as a &ldquo;quantum bug&rdquo; that  destroys fundamental properties that quantum computers would rely on.<\/p>\n<p>The research will appear in the online version of <em>Nature<\/em> magazine today.<\/p>\n<p>Quantum computing uses quantum bits, or qubits, to encode information  in the form of ones and zeros. Unlike a traditional computer that uses  traditional bits, a quantum computer takes advantage of the seemingly  impossible fact that qubits can exist in multiple states at the same  time, which is called &ldquo;superposition.&rdquo;<\/p>\n<p>While a bit can represent either a one or a zero, a qubit can  represent a one and a zero at the same time due to superposition. This  allows for simultaneous processing of calculations in a truly parallel  system, skyrocketing computing ability.<\/p>\n<p>Though the concepts underpinning quantum computing are not new,  problems such as decoherence have hindered the construction of a fully  functioning quantum computer.<\/p>\n<p>Think of decoherence as a form of noise or interference, knocking a  quantum particle out of superposition&nbsp;&mdash; robbing it of that special  property that makes it so useful. If a quantum computer relies on a  quantum particle&rsquo;s ability to be both here and there, then decoherence  is the frustrating phenomenon that causes a quantum particle to be  either here or there.<\/p>\n<p>University of British Columbia researchers calculated all sources of  decoherence in their experiment as a function of temperature, magnetic  field and by nuclear isotopic concentrations, and suggested the optimum  condition to operate qubits, reducing decoherence by approximately 1,000  times.<\/p>\n<p>&nbsp;<\/p>\n<div style=\"border-width: 0px; padding-left: 100px; padding-bottom: 5px; width: 225px; padding-top: 0px;\"><img loading=\"lazy\" decoding=\"async\" src=\"\/wp-content\/uploads\/sites\/7\/migration-uploads\/computing2-984.jpg\" alt=\"\" width=\"225\" height=\"350\"><br \/><span class=\"caption\"><\/p>\n<h5>Susumu Takahashi, assistant professor of chemisty in USC Dornsife.<\/h5>\n<p><\/span><\/div>\n<p>In  Takahashi&rsquo;s experiments, qubits were predicted to last about 500  microseconds at the optimum condition &mdash; ages, relatively speaking.<\/p>\n<p>Decoherence in qubit systems falls into two general categories. One  is an intrinsic decoherence caused by constituents in the qubit system,  and the other is an extrinsic decoherence caused by imperfections of the  system &mdash; impurities and defects, for example.<\/p>\n<p>In their study, Takahashi and his colleagues investigated single  crystals of molecular magnets. Because of their purity, molecular  magnets eliminate the extrinsic decoherence, allowing researchers to  calculate intrinsic decoherence precisely.<\/p>\n<p>&ldquo;For the first time, we&rsquo;ve been able to predict and control all the  environmental decoherence mechanisms in a very complex system &mdash; in this  case a large magnetic molecule,&rdquo; said Phil Stamp, University of British  Columbia professor of physics and astronomy and director of the Pacific  Institute of Theoretical Physics.<\/p>\n<p>Using crystalline molecular magnets allowed researchers to build  qubits out of an immense quantity of quantum particles rather than a  single quantum object &mdash; the way most proto-quantum computers are built  at the moment.<\/p>\n<p>&ldquo;This will obviously increase signals from the qubit drastically so  the detection of the qubit in the molecular magnets is much easier,&rdquo;  said Takahashi, who conducted his research as a project scientist in the  Institute of Terahertz Science and Technology and the Department of  Physics at the University of California, Santa Barbara. Takahashi has  been at USC Dornsife since 2010.<\/p>\n<p>Research for the article was performed in collaboration with Phil  Stamp and Igor Tupitsyn of the University of British Columbia, Johan van  Tol of Florida State University, and Chris Beedle and David Hendrickson  of the University of California, San Diego.<\/p>\n<p>The work was supported by the National Science Foundation, the W. M.  Keck Foundation, the Pacific Institute of Theoretical Physics at the  University of British Columbia, by the Natural Sciences and Engineering  Research Council of Canada, the Canadian Institute for Advanced Research  and the USC start-up funds.<\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":0,"featured_media":11181,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[10],"tags":[78,96,1139,712],"class_list":["post-11178","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faculty","tag-chemistry","tag-natural-sciences","tag-quantum-mechanics","tag-technology"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>USC Scientists Contribute to a Breakthrough in Quantum 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