{"id":16219,"date":"2026-04-14T09:31:49","date_gmt":"2026-04-14T07:31:49","guid":{"rendered":"https:\/\/qilimanjaro.tech\/?p=16219"},"modified":"2026-04-14T11:07:50","modified_gmt":"2026-04-14T09:07:50","slug":"a-practical-guide-to-quantum-concepts","status":"publish","type":"post","link":"https:\/\/qilimanjaro.tech\/ca\/a-practical-guide-to-quantum-concepts\/","title":{"rendered":"Guia pr\u00e0ctica dels conceptes qu\u00e0ntics"},"content":{"rendered":"
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Fent que els conceptes fonamentals de la computaci\u00f3 qu\u00e0ntica siguin m\u00e9s f\u00e0cils d'entendre.<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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La computaci\u00f3 qu\u00e0ntica \u00e9s complexa, per\u00f2 entendre'n els conceptes b\u00e0sics no ha de ser-ho. Aquesta guia desglossa els conceptes clau per ajudar-vos a entendre com funciona.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Qubit<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Un qubit \u00e9s la versi\u00f3 qu\u00e0ntica d'un bit: mentre que un bit nom\u00e9s pot prendre els valors 0 o 1, un qubit t\u00e9 dos estats base |0\u27e9 i |1\u27e9 i pot trobar-se en qualsevol d'ells o en una combinaci\u00f3 lineal (o superposici\u00f3) d'ambd\u00f3s.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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<\/span><\/span>Superposici\u00f3<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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En el m\u00f3n cl\u00e0ssic, un sistema es troba en un estat ben definit (per exemple, una moneda \u00e9s cara o creu). En el m\u00f3n qu\u00e0ntic, la informaci\u00f3 que tenim sobre un sistema \u00e9s compatible amb el fet que es trobi en una combinaci\u00f3 de m\u00faltiples estats alhora, fins que es mesura. Cada estat t\u00e9 un pes o percentatge segons el qual pot \"col\u00b7lapsar\" durant el proc\u00e9s de mesura.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Entrella\u00e7ament<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Dues part\u00edcules poden quedar entrella\u00e7ades de manera que, per molt lluny que estiguin, mesurar-ne una afecta instant\u00e0niament l'altra. Aquest fenomen qu\u00e0ntic \u00e9s fonamental en aplicacions com les comunicacions qu\u00e0ntiques o la computaci\u00f3 qu\u00e0ntica.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Coher\u00e8ncia<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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\u00c9s el temps durant el qual un qubit pot mantenir el seu estat qu\u00e0ntic (superposici\u00f3 i entrella\u00e7ament) sense degradar-se, abans que les pertorbacions ambientals facin que perdi la seva informaci\u00f3. B\u00e0sicament, \u00e9s el temps durant el qual el qubit es pot utilitzar per fer c\u00e0lculs.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Decoher\u00e8ncia<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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\u00c9s el fenomen pel qual un qubit perd la seva coher\u00e8ncia a causa de la interacci\u00f3 amb l'entorn (llum, calor, soroll o mesura). Gestionar la decoher\u00e8ncia \u00e9s essencial per mantenir l'estat qu\u00e0ntic dels qubits i aconseguir operacions fiables.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Computaci\u00f3 qu\u00e0ntica<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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La computaci\u00f3 qu\u00e0ntica \u00e9s un paradigma computacional basat en les lleis de la mec\u00e0nica qu\u00e0ntica, en qu\u00e8 la informaci\u00f3 es codifica en qubits i s'exploten fen\u00f2mens com la superposici\u00f3 i l'entrella\u00e7ament per processar informaci\u00f3 d'una manera diferent de la computaci\u00f3 cl\u00e0ssica. No es tracta simplement d'un supercomputador m\u00e9s r\u00e0pid, sin\u00f3 d'un model computacional diferent que pot oferir avantatges per a certes classes de problemes espec\u00edfics, com la simulaci\u00f3, l'optimitzaci\u00f3, certes subrutines d'IA i problemes de criptografia.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Qubit f\u00edsic<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Un qubit f\u00edsic \u00e9s un sistema qu\u00e0ntic real, implementat en hardware, capa\u00e7 de codificar i manipular informaci\u00f3 en dos estats qu\u00e0ntics ben definits (|0\u27e9 i |1\u27e9). \u00c9s molt sensible a l'entorn i intr\u00ednsecament soroll\u00f3s, per la qual cosa pateix decoher\u00e8ncia i errors que limiten la fiabilitat dels c\u00e0lculs. Hi ha diferents implementacions tecnol\u00f2giques de qubits f\u00edsics, com ara circuits superconductors, \u00e0toms neutres, ions atrapats i fotons, entre d'altres.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Qubit l\u00f2gic<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Un qubit l\u00f2gic (o \"virtual\") \u00e9s una unitat tolerant a errors d'informaci\u00f3 qu\u00e0ntica que codifica l'estat d'un qubit en m\u00faltiples qubits f\u00edsics entrella\u00e7ats mitjan\u00e7ant t\u00e8cniques de correcci\u00f3 d'errors qu\u00e0ntics. \u00c9s l'element clau per construir ordinadors qu\u00e0ntics digitals escalables i fiables (tolerants a errors).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Computaci\u00f3 qu\u00e0ntica full-stack<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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\u00c9s un enfocament integral que engloba el desenvolupament coordinat del hardware qu\u00e0ntic, el control electr\u00f2nic, el software de baix i alt nivell, els algorismes i les aplicacions, sota una estrat\u00e8gia de codisseny. Aquest enfocament optimitza el rendiment del sistema d'extrem a extrem, alineant l'arquitectura f\u00edsica amb les capes de programaci\u00f3 i els casos d'\u00fas, la qual cosa permet assolir m\u00e9s r\u00e0pidament un avantatge pr\u00e0ctic en comparaci\u00f3 amb els models fragmentats.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Integraci\u00f3 cl\u00e0ssica\u2013qu\u00e0ntica (o computaci\u00f3 h\u00edbrida)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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\u00c9s el model en qu\u00e8 els ordinadors qu\u00e0ntics operen com a acceleradors especialitzats dins d'infraestructures de computaci\u00f3 d'alt rendiment (HPC), delegant a la unitat de processament qu\u00e0ntic (QPU) els subproblemes en qu\u00e8 pot aportar un avantatge, mentre que la computaci\u00f3 cl\u00e0ssica s'encarrega de l'orquestraci\u00f3, el pre- i post-processament, i el control del flux de treball.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Qubits de fluxonium<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Els qubits de fluxonium s\u00f3n un tipus de qubit superconductor dissenyat per millorar l'estabilitat i reduir la sensibilitat al soroll. Utilitzen un circuit amb una uni\u00f3 Josephson i una induct\u00e0ncia gran, cosa que els permet mantenir el seu estat qu\u00e0ntic durant m\u00e9s temps. Aix\u00f2 els converteix en un enfocament prometedor per construir sistemes qu\u00e0ntics m\u00e9s fiables, especialment en la computaci\u00f3 qu\u00e0ntica anal\u00f2gica.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Computaci\u00f3 qu\u00e0ntica anal\u00f2gica<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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La computaci\u00f3 qu\u00e0ntica anal\u00f2gica segueix un enfocament diferent. En lloc d'aplicar portes discretes, el problema es codifica directament en un sistema f\u00edsic, que es controla de manera cont\u00ednua.<\/p>

El sistema evoluciona gradualment des d'un estat inicial fins a un estat final que representa la soluci\u00f3. Aquesta evoluci\u00f3 cont\u00ednua pot reduir certs tipus d'errors en comparaci\u00f3 amb els enfocaments basats en portes.<\/p>

Aquest model \u00e9s especialment adequat per a problemes com l'optimitzaci\u00f3 i la simulaci\u00f3. Un exemple clau \u00e9s el quantum annealing<\/strong>, on el sistema es guia cap a l'estat d'energia m\u00e9s baixa per trobar solucions \u00f2ptimes.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Computaci\u00f3 qu\u00e0ntica digital<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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La computaci\u00f3 qu\u00e0ntica digital \u00e9s conceptualment semblant a la computaci\u00f3 cl\u00e0ssica: els c\u00e0lculs es realitzen mitjan\u00e7ant una seq\u00fc\u00e8ncia de portes qu\u00e0ntiques aplicades pas a pas.<\/p>

Aquestes portes no s\u00f3n circuits f\u00edsics, sin\u00f3 polsos d'energia d'alta precisi\u00f3 (com microones o l\u00e0sers) utilitzats per controlar l'estat dels qubits.<\/p>

Com que els qubits s\u00f3n extremadament sensibles al seu entorn, els errors s\u00f3n inevitables. Per abordar-ho, la computaci\u00f3 qu\u00e0ntica digital es basa en la correcci\u00f3 d'errors, on la informaci\u00f3 es distribueix entre molts qubits f\u00edsics per formar un qubit l\u00f2gic m\u00e9s estable<\/strong>.<\/p>

Tot i que aquest enfocament \u00e9s universal i pot, en principi, resoldre qualsevol problema computable, requereix un gran nombre de qubits per aconseguir resultats fiables.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Emulador<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Un emulador \u00e9s un sistema cl\u00e0ssic que, mitjan\u00e7ant algorismes cl\u00e0ssics, pret\u00e9n reproduir un fenomen qu\u00e0ntic. Aquests emuladors funcionen per a sistemes qu\u00e0ntics espec\u00edfics i sota certes condicions, com ara tenir poc entrella\u00e7ament en el sistema que volem emular. L'entrella\u00e7ament \u00e9s precisament una de les propietats fonamentals que caracteritzen com de \"profundament qu\u00e0ntic\" \u00e9s un sistema. Quan el grau d'entrella\u00e7ament augmenta significativament, l'emulaci\u00f3 cl\u00e0ssica esdev\u00e9 exponencialment costosa o fins i tot impracticable. Per tant, els emuladors no ens permeten superar les limitacions dels ordinadors cl\u00e0ssics i no poden proporcionar un avantatge qu\u00e0ntic.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Simulador<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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\u00c9s un dispositiu dissenyat per emular els fen\u00f2mens qu\u00e0ntics d'un sistema f\u00edsic espec\u00edfic. A difer\u00e8ncia d'un ordinador qu\u00e0ntic universal, generalment no \u00e9s programable; \u00e9s a dir, no pot executar una \u00e0mplia varietat d'algorismes o protocols. La seva funci\u00f3 es limita estrictament a copiar el comportament del sistema qu\u00e0ntic per al qual va ser creat. El simulador qu\u00e0ntic funciona sobre un ordinador qu\u00e0ntic de prop\u00f2sit espec\u00edfic, la qual cosa significa que pot proporcionar un avantatge qu\u00e0ntic. Els conceptes d'emulador i simulador sovint es confonen en aquest camp.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Computaci\u00f3 d'inspiraci\u00f3 qu\u00e0ntica<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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La computaci\u00f3 d'inspiraci\u00f3 qu\u00e0ntica consisteix a utilitzar algorismes cl\u00e0ssics que s'executen en ordinadors convencionals (CPU o GPU) per emular el comportament d'un sistema qu\u00e0ntic amb un nivell de precisi\u00f3 finit. Aquest enfocament no dep\u00e8n de hardware qu\u00e0ntic ni de fen\u00f2mens qu\u00e0ntics f\u00edsics.
Una de les eines cl\u00e0ssiques m\u00e9s conegudes per aproximar sistemes qu\u00e0ntics s\u00f3n les xarxes de tensors<\/b>. Aquesta formalitzaci\u00f3 matem\u00e0tica es va desenvolupar originalment per emular el comportament de sistemes multipart\u00edcula. Aquestes t\u00e8cniques poden representar certs sistemes complexos en un format comprimit i han trobat aplicacions en \u00e0rees com l'optimitzaci\u00f3 i la compressi\u00f3 de models d'intel\u00b7lig\u00e8ncia artificial.
Tot i aix\u00f2, aquests m\u00e8todes tenen una limitaci\u00f3 estructural ben coneguda: les xarxes de tensors nom\u00e9s s\u00f3n eficients per emular sistemes qu\u00e0ntics quan hi ha un nivell limitat d'entrella\u00e7ament entre els seus qubits.
En conseq\u00fc\u00e8ncia, tot i que aquestes t\u00e8cniques poden oferir avantatges computacionals en contextos espec\u00edfics, s\u00f3n aproximacions basades completament en recursos de computaci\u00f3 cl\u00e0ssica. Com que no operen sobre estats qu\u00e0ntics f\u00edsics, no reprodueixen directament fen\u00f2mens qu\u00e0ntics genu\u00efns ni proporcionen un avantatge qu\u00e0ntic.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Digital Annealer<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Un Digital Annealer \u00e9s un emulador o processador cl\u00e0ssic dissenyat espec\u00edficament per resoldre problemes d'optimitzaci\u00f3. S'anomena \"digital\" perqu\u00e8 es construeix amb transistors i circuits electr\u00f2nics convencionals, i \"annealer\" perqu\u00e8 la seva arquitectura de hardware reprodueix el concepte de simulated annealing, un algorisme cl\u00e0ssic inspirat en processos termodin\u00e0mics.

El simulated annealing es pot considerar la contrapartida cl\u00e0ssica (o emulador) de l'algorisme de quantum annealing, tot i que no explota fen\u00f2mens qu\u00e0ntics com la superposici\u00f3 o l'entrella\u00e7ament.

Un Digital Annealer pot oferir millores de rendiment respecte a arquitectures cl\u00e0ssiques de prop\u00f2sit general per a certs problemes d'optimitzaci\u00f3. No obstant aix\u00f2, com que aquests processadors es basen en tecnologia electr\u00f2nica convencional, el seu funcionament es troba completament dins del paradigma de la computaci\u00f3 cl\u00e0ssica i no poden proporcionar un avantatge qu\u00e0ntic.<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

Making the core concepts of quantum computing easier to understand. Quantum computing is complex, but understanding the basics doesn\u2019t have to be. This guide breaks down the key concepts to help you understand how it works. Qubit A qubit is the quantum version of a bit: while a bit can only take the values 0 […]<\/p>\n","protected":false},"author":3,"featured_media":16284,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[8],"tags":[],"class_list":["post-16219","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science"],"yoast_head":"\nA Practical Guide to Quantum Concepts - Qilimanjaro<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/qilimanjaro.tech\/ca\/a-practical-guide-to-quantum-concepts\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A Practical Guide to Quantum Concepts - Qilimanjaro\" \/>\n<meta property=\"og:description\" content=\"Making the core concepts of quantum computing easier to understand. 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