![\"Twice](\"https:\/\/www.europesays.com\/uk\/wp-content\/uploads\/2025\/10\/twice-around-to-return.jpg\" "\\"A")
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A walk in the space of rotating spins and qubits. Credit: Physical Review Letters (2025). DOI: 10.1103\/xk8y-hycn<\/p>\n
The world is filled with rotating objects\u2014gyroscopes, magnetic spins, and more recently, qubits in quantum computers. For example, the atomic nuclei in our bodies precess at megahertz frequencies inside NMR machines. In practice, it is often desirable to return such a rotating system precisely to its starting point. At first glance, this seems impossible: after an elaborate sequence of twists and wobbles, how could one possibly retrace the path back to the origin?<\/p>\n
The astonishing answer is that it is always possible. No matter how tangled the history of rotations, there exists a simple recipe: rescale the driving force and apply it twice. A single application is never sufficient, but applying this doubled, rescaled force guarantees an exact return. Under this operation, the spin\u2014or the qubit, or any rotor\u2014will unfailingly come home.<\/p>\n
This discovery was made by Distinguished Professor Tsvi Tlusty from the Department of Physics at UNIST and Jean-Pierre Eckmann from the University of Geneva, Switzerland. Their study, published<\/a> in Physical Review Letters on October 1, 2025, reveals that, despite their apparent complexity, rotations conceal a fundamental order.<\/p>\n The mathematical groups describing rotations\u2014known as SO(3) for classical objects and SU(2) for quantum ones\u2014are among the most studied in physics. Yet even within this well-understood framework, the authors identified a new, elegant solution: a perfect reset button.<\/p>\n Why does this matter? Because rotations underpin nearly all modern technology<\/a> and science. From stabilizing satellites to decoding brain scans<\/a>, from nuclear magnetic resonance<\/a> to quantum computing, we constantly task rotators with performing intricate dances. This new result guarantees that, regardless of how complicated the choreography, there is always a way to return the system to its original pose.<\/p>\n More information:<\/strong> \n\t\t\t\t\t\t\t\t\t\t\t\t\tProvided by \t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n \n\t\t\t\t\t\t\t\t\t\t\t\tCitation<\/strong>: \n\t\t\t\t\t\t\t\t\t\t\t This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
\n\t\t\t\t\t\t\t\t\t\t\t\tJean-Pierre Eckmann et al, Walks in Rotation Spaces Return Home when Doubled and Scaled, Physical Review Letters (2025). DOI: 10.1103\/xk8y-hycn<\/a>. On arXiv: DOI: 10.48550\/arxiv.2502.14367<\/a><\/p>\n
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tUlsan National Institute of Science and Technology<\/a>
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\n\t\t\t\t\t\t\t\t\t\t\t\tTwice around to return home: A hidden reset button for spins and qubits (2025, October 16)
\n\t\t\t\t\t\t\t\t\t\t\t\tretrieved 17 October 2025
\n\t\t\t\t\t\t\t\t\t\t\t\tfrom https:\/\/phys.org\/news\/2025-10-home-hidden-reset-button-qubits.html\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n
\n\t\t\t\t\t\t\t\t\t\t\t part may be reproduced without the written permission. The content is provided for information purposes only.\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n","protected":false},"excerpt":{"rendered":"A walk in the space of rotating spins and qubits. Credit: Physical Review Letters (2025). DOI: 10.1103\/xk8y-hycn The…\n","protected":false},"author":2,"featured_media":506234,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3845],"tags":[75,76,74,71,70,72,53,73,16,15],"class_list":{"0":"post-506233","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-physics","8":"tag-materials","9":"tag-nanotech","10":"tag-physics","11":"tag-physics-news","12":"tag-science","13":"tag-science-news","14":"tag-technology","15":"tag-technology-news","16":"tag-uk","17":"tag-united-kingdom"},"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@uk\/115388308307167298","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/posts\/506233","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/comments?post=506233"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/posts\/506233\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/media\/506234"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/media?parent=506233"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/categories?post=506233"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/tags?post=506233"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}