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Inside a single charged atom held nearly still by electric fields, a hidden effect appeared in measurable motion.<\/p>\n
By steering that motion with lasers, Dr. Oana B\u0103z\u0103van, a physicist at the University of Oxford<\/a>, demonstrated quadsqueezing\u2014a rare fourth-order form of quantum squeezing\u2014alongside two simpler versions.<\/p>\n The newly created quantum state\u2014built from four linked units of motion instead of the usual two\u2014emerged more than 100 times faster than conventional laser-driving would have allowed.<\/p>\n That speed matters because fragile quantum motion can fade before slower techniques finish building the state.<\/p>\n Squeezing and quantum motion<\/p>\n Many quantum systems move in regular steps, and physicists describe that motion as a quantum harmonic oscillator<\/a>\u2014a tiny system with evenly spaced energy levels.<\/p>\n Ordinary squeezing\u2014a way to redistribute quantum uncertainty\u2014changes the tradeoff between position and momentum, making one clearer and the other less certain.<\/p>\n Similar squeezing has helped the Laser Interferometer Gravitational-Wave Observatory (LIGO<\/a>)\u2014a U.S. detector for gravitational waves\u2014make cleaner measurements.<\/p>\n Oxford\u2019s result moves beyond that familiar two-way tradeoff and starts shaping higher-order motion that quantum computers may need.<\/p>\n Forces that disagree<\/p>\n Instead of building a special device, the team combined two controlled laser forces that acted on the same ion<\/a>.<\/p>\n Each force pushed the ion\u2019s motion in a simple way, but their combined order changed the final outcome.<\/p>\n Physicists call this non-commutativity, which means doing A then B can differ from doing B then A.<\/p>\n \u201cHere, we took the opposite approach and used that feature to generate stronger quantum interactions,\u201d said B\u0103z\u0103van.<\/p>\n Climbing higher orders<\/p>\n Changing laser frequencies let the same machine progress from ordinary quantum squeezing to a more complex three-part version of the effect.<\/p>\n A larger adjustment produced an even more complex state that linked four parts of the atom\u2019s motion in a single controlled interaction.<\/p>\n Directly forcing such behavior usually weakens fast as the order rises, so noise can cover the signal.<\/p>\n Oxford\u2019s method avoided much of that loss by using the ion\u2019s spin, a quantum property with two controllable internal settings.<\/p>\n Seeing the shape<\/p>\n To confirm the states, the researchers rebuilt the ion\u2019s quantum motion from many careful measurements.<\/p>\n The result was a Wigner function\u2014a mathematical picture showing position and momentum information together.<\/p>\n Second-, third-, and fourth-order versions formed distinct patterns, matching simulations based on independently measured settings.<\/p>\n Those patterns gave the experiment more weight than a single number, because each state showed a different measurable shape.<\/p>\n Why shape matters<\/p>\n Higher-order states matter because they behave in ways that ordinary quantum states do not, creating patterns that standard calculations cannot easily reproduce.<\/p>\n That odd shape gives quantum machines operations that ordinary squeezing and basic movement cannot supply.<\/p>\n Continuous-variable quantum computing<\/a> stores information in continuously changing quantum values rather than simple on-off states, and it depends on these unusual quantum effects to perform its full range of operations.<\/p>\n Without those tools, parts of the machine remain easy for classical computers to imitate.<\/p>\n Not a computer<\/p>\n One trapped ion cannot run a useful quantum computer, and the Oxford experiment did not claim that.<\/p>\n The ion served as a clean test bed where motion and spin could be controlled with unusually fine timing.<\/p>\n Background interference still weakened some of the clearest signatures of unusual quantum behavior in the weakest high-order states. For now, the result proves control, not a ready-made processor.<\/p>\n A flexible recipe<\/p>\n Years before the demonstration, a 2021 proposal<\/a> mapped a route using spin-motion interactions. Such spin-motion interactions link an ion\u2019s internal setting to its movement, giving physicists a way to steer richer effects.<\/p>\n By changing detuning\u2014a small offset from a target frequency\u2014the team selected which interaction appeared.<\/p>\n That adjustability makes the method appealing beyond one ion, provided extra motion does not add too much noise.<\/p>\n Importance of quantum motion<\/p>\n Scaling the method would mean controlling several motional modes, which are separate ways the trapped ion can move.<\/p>\n With several modes, researchers could build interactions useful for simulation, sensing, and error-resistant quantum information.<\/p>\n The same spin control could also help create specially prepared quantum states\u2014carefully arranged patterns of quantum<\/a> behavior\u2014during a calculation instead of only before it begins.<\/p>\n \u201cFundamentally, we have demonstrated a new type of interaction that lets us explore quantum physics in uncharted territory, and we are genuinely excited for the discoveries to come,\u201d said Dr. Raghavendra Srinivas, a physicist at Oxford\u2019s Department of Physics and study supervisor.<\/p>\n A stronger handle<\/p>\n A single ion gave physicists a sharper handle on high-order quantum behavior by turning disagreeing forces into controlled motion.<\/p>\n That handle will matter only if future systems keep the speed advantage while adding more particles, modes, and checks.<\/p>\n The study is published in Nature Physics<\/a>.<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"A new study has found that a single trapped atom can create a previously unseen form of quantum…\n","protected":false},"author":2,"featured_media":627867,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49],"tags":[199,79],"class_list":["post-627866","post","type-post","status-publish","format-standard","has-post-thumbnail","category-physics","tag-physics","tag-science"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/627866","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/comments?post=627866"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/627866\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media\/627867"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media?parent=627866"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/categories?post=627866"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/tags?post=627866"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}