{"id":108764,"date":"2026-10-16T07:25:06","date_gmt":"2026-10-16T07:25:06","guid":{"rendered":"https:\/\/cryptonews.com\/se\/news\/googles-kvantgenombrott-bitcoin-kryptografi-risk\/"},"modified":"2026-10-16T07:25:06","modified_gmt":"2026-10-16T07:25:06","slug":"googles-kvantgenombrott-bitcoin-kryptografi-risk","status":"publish","type":"post","link":"https:\/\/cryptonews.com\/se\/news\/googles-kvantgenombrott-bitcoin-kryptografi-risk\/","title":{"rendered":"Googles kvantgenombrott: Bitcoin och framtidens kryptografi"},"content":{"rendered":"<p>Googles senaste teknik inom kvantber\u00e4kningar rapporteras s\u00e4nka relevanta felmarginaler med en faktor p\u00e5 40 och uppn\u00e5 en noggrannhet p\u00e5 99,9 %. Detta \u00e4r ett framsteg inom ett omr\u00e5de vars framtida kapacitet skulle kunna hota Bitcoins kryptografi. Resultatet adresserar dock specifikt kvantfel, och Googles metod beh\u00f6ver fortfarande demonstreras i en st\u00f6rre skala.<\/p><p>Detta inneb\u00e4r att det omedelbara hotet mot n\u00e4tverket f\u00f6rblir of\u00f6r\u00e4ndrat, samtidigt som det g\u00f6r det sv\u00e5rare att avf\u00e4rda den l\u00e5ngsiktiga kvantrisken f\u00f6r Bitcoin som ett rent teoretiskt ingenj\u00f6rsproblem. Gapet minskar, men det \u00e4r fortfarande betydande.<\/p><p><\/p><blockquote class=\"twitter-tweet\" data-width=\"550\" data-dnt=\"true\"><p lang=\"en\" dir=\"ltr\">\ud83d\udea8JUST IN: Google may bring Bitcoin\u2019s Q-Day sooner than expected after its Willow chip cuts quantum errors 40x.<br><br>Google says a technique called \u201cmagic state cultivation\u201d now works on its Willow chip, cutting errors about 40x with a record 99.99% accuracy.<br><br>Q-Day is the moment a\u2026 <a href=\"https:\/\/t.co\/6fquMJURPH\">pic.twitter.com\/6fquMJURPH<\/a><\/p>&mdash; Coin Bureau (@coinbureau) <a href=\"https:\/\/x.com\/coinbureau\/status\/2110823318848958534?ref_src=twsrc%5Etfw\">October 15, 2026<\/a><\/blockquote><script async src=\"https:\/\/platform.x.com\/widgets.js\" charset=\"utf-8\"><\/script><p>Googles forskning fokuserar p\u00e5 s\u00e5 kallade &#8221;magic states&#8221;, en specialiserad resurs inom kvantber\u00e4kning som enligt huvudrapporten vanligtvis f\u00f6rbrukar omkring 95 % av en kvantdators kapacitet. Att f\u00f6rb\u00e4ttra tillf\u00f6rlitligheten och produktionen av dessa tillst\u00e5nd kan l\u00f6sa en stor flaskhals i arbetet med att bygga st\u00f6rre och mer anv\u00e4ndbara maskiner.<\/p><p>Kvantfelkorrigering \u00e4r n\u00f6dv\u00e4ndig f\u00f6r ett tillr\u00e4ckligt kraftfullt feltolerant system, men hotet mot Bitcoin bygger p\u00e5 att m\u00e5nga kr\u00e4vande funktioner samverkar. Denna milstolpe st\u00e4rker argumenten f\u00f6r l\u00e5ngsiktiga f\u00f6rberedelser.<\/p><h2>Hur l\u00e5ngt borta \u00e4r en kvantattack mot Bitcoin enligt Google?<\/h2><span class=\"replacer\"><\/span><p>Ett whitepaper fr\u00e5n Google som publicerades i mars uppskattade att det skulle kr\u00e4vas mellan 1 200 och 1 450 logiska kvantbitar (qubits) f\u00f6r att kn\u00e4cka Bitcoins s\u00e4kerhet. Det r\u00f6r sig allts\u00e5 om logiska kvantbitar \u2013 de felkorrigerade enheter som kr\u00e4vs f\u00f6r tillf\u00f6rlitliga ber\u00e4kningar \u2013 och inte bara de r\u00e5a fysiska kvantbitar som finns installerade i en processor.<\/p><p>Googles Willow-chip, som tillk\u00e4nnagavs i december 2024, har 105 kvantbitar. IBM har rapporterat 70 logiska kvantbitar, medan QuEra har utf\u00f6rt algoritmer med upp till 96 logiska kvantbitar. IBM:s roadmap siktar p\u00e5 200 logiska kvantbitar till 2029 och 2 000 till 2033, vilket g\u00f6r m\u00e5len till framtida f\u00f6retagsm\u00e5l snarare \u00e4n nuvarande kapacitet.<\/p><p>En separat Google-kopplad resursuppskattning som diskuterats i annan rapportering placerar kravet under 500 000 fysiska kvantbitar under specifika antaganden. Denna villkorade uppskattning av fysiska kvantbitar \u00e4r dock inte en ers\u00e4ttning f\u00f6r siffran p\u00e5 1 200\u20131 450 logiska kvantbitar.<\/p><figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cryptonews.com\/wp-content\/uploads\/sites\/14\/2026\/10\/content-img-1-21.jpg\" alt=\"Kvantrisken f\u00f6r Bitcoin v\u00e4xer n\u00e4r Google rapporterar 40 g\u00e5nger f\u00e4rre fel och 99,9 % noggrannhet. Kommer Q-day allt n\u00e4rmare?\"><\/figure><p>Likas\u00e5 beskriver ett scenario d\u00e4r en avancerad maskin skulle kunna h\u00e4rleda en privat nyckel fr\u00e5n en exponerad publik nyckel p\u00e5 nio minuter en hypotetisk attackkapacitet, inte en maskin som existerar i dag.<\/p><p>Den praktiska exponeringen beror ocks\u00e5 p\u00e5 om en publik nyckel avsl\u00f6jas. En analys fr\u00e5n Google g\u00e4llande kvants\u00e5rbarheter i kryptovalutaadresser tar upp den bredare risken, medan Bitcoins slutgiltiga svar skulle kr\u00e4va en tekniskt sund migreringsv\u00e4g och samordning mellan anv\u00e4ndare, utvecklare och f\u00f6rvaltare.<\/p><h2>En s\u00e4kerhetsfr\u00e5ga p\u00e5 l\u00e5ng sikt<\/h2><span class=\"replacer\"><\/span><p>Huvudrapporten uppskattar att cirka 6,26 miljoner BTC finns p\u00e5 adresser som \u00e4r s\u00e5rbara f\u00f6r kvantdatorer. Risken \u00e4r villkorad av att framtida maskiner blir kapabla att h\u00e4rleda privata nycklar fr\u00e5n exponerade publika nycklar. Bitcoins l\u00e5ngsiktiga s\u00e4kerhetsdebatt r\u00f6r b\u00e5de styrkan i framtida kvanth\u00e5rdvara och f\u00f6rm\u00e5gan att flytta ber\u00f6rda medel till s\u00e4krare l\u00f6sningar.<\/p><p>Jameson Lopp, medgrundare och s\u00e4kerhetschef p\u00e5 Casa, menar att en maskin som \u00e4r kraftfull nog att avkoda en publik nyckel f\u00f6r Bitcoin kan vara minst ett decennium bort. Googles framsteg inom felkorrigering understryker varf\u00f6r fr\u00e5gan f\u00f6rtj\u00e4nar planering.<\/p><figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cryptonews.com\/wp-content\/themes\/cryptonews\/images\/p\/no_image.svg\" alt=\"Kvantrisken f\u00f6r Bitcoin v\u00e4xer n\u00e4r Google rapporterar 40 g\u00e5nger f\u00e4rre fel och 99,9 % noggrannhet. Kommer Q-day allt n\u00e4rmare?\" class=\" lazyload\" data-src=\"https:\/\/cryptonews.com\/wp-content\/uploads\/sites\/14\/2026\/10\/content-img-2-3.jpg\" data-srcset=\"\"><figcaption class=\"wp-element-caption\">Jameson Lopp &#8211; Foto: Gage Skidmore \/ CC BY-SA 2.0<\/figcaption><\/figure><p>I dagsl\u00e4get gav Polymarket en sannolikhet p\u00e5 1 % f\u00f6r att den relevanta m\u00f6jligheten skulle intr\u00e4ffa vid \u00e5rets slut, och 11 % vid slutet av 2027, enligt k\u00e4llartikeln. Den mer best\u00e5ende inneb\u00f6rden \u00e4r att utmaningen med Bitcoins migrering till post-kvantkryptografi beh\u00f6ver \u00f6verv\u00e4gas i god tid innan en trov\u00e4rdig maskin med attackkapacitet dyker upp.<\/p><p>N\u00e4r det g\u00e4ller positionering i BTC utg\u00f6r Googles resultat inte en omedelbar s\u00e4kerhetsh\u00e4ndelse eller en frist\u00e5ende s\u00e4ljsignal. Det ger dock tyngd \u00e5t den l\u00e5ngsiktiga extremrisken: felkorrigeringen g\u00e5r fram\u00e5t, men steget fr\u00e5n en milstolpe i laboratoriet till ett tillf\u00f6rlitligt system som kan kn\u00e4cka Bitcoin kr\u00e4ver fortfarande skala, feltolerans och uth\u00e5lliga ber\u00e4kningar som dagens maskiner \u00e4nnu inte har demonstrerat.<\/p>","protected":false},"excerpt":{"rendered":"<p>Googles nya metod f\u00f6r felkorrigering n\u00e5r 99,9 % noggrannhet. L\u00e4s om hur detta p\u00e5verkar Bitcoins s\u00e4kerhet och risken f\u00f6r kvantdatorattacker p\u00e5 sikt.<\/p>\n","protected":false},"author":261,"featured_media":108761,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[6,1],"tags":[],"editors":[76],"sponsored_companies":[],"class_list":["post-108764","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bitcoin-news","category-news","editors-malin-engdahl"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Googles kvantgenombrott: Bitcoin och framtidens kryptografi<\/title>\n<meta name=\"description\" content=\"Googles nya metod f\u00f6r felkorrigering n\u00e5r 99,9 % noggrannhet. 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