Sprostitev veččasovne statistike v kvantnih sistemih

Sprostitev veččasovne statistike v kvantnih sistemih

Izvorno vozlišče: 2699820

Neil Dowling1, Pedro Figueroa-Romero2, Felix A. Pollock1, Philipp Strasberg3, in Kavan Modi1

1Šola za fiziko in astronomijo, Univerza Monash, Victoria 3800, Avstralija
2Hon Hai Quantum Computing Research Center, Taipei, Tajvan
3Física Teòrica: Informació in Fenòmens Quàntics, Departament de Física, Universitat Autònoma de Barcelona, ​​08193 Bellaterra (Barcelona), Španija

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Minimalizem

Ravnotežna statistična mehanika zagotavlja zmogljiva orodja za razumevanje fizike na makroskali. Vendar pa ostaja vprašanje, kako je to mogoče utemeljiti na podlagi mikroskopskega kvantnega opisa. Tukaj razširjamo ideje kvantne statistične mehanike čistega stanja, ki se osredotočajo na posamezno časovno statistiko, da pokažemo uravnoteženje izoliranih kvantnih procesov. Pokazali smo namreč, da večina večkratnih opazovanj za dovolj velike čase ne more ločiti neravnovesnega procesa od ravnotežnega, razen če je sistem sondiran izjemno velikokrat ali če je opazovalka posebej drobnozrnata. Posledica naših rezultatov je, da se velikost ne-markovskosti in druge veččasovne značilnosti neravnovesnega procesa prav tako uravnovesijo.

Zakaj so makroskopske lastnosti sistema več teles običajno približno stacionarne kljub temu, da se natančno napačno stanje nenehno razvija? Splošno razširjeno prepričanje je, da bi kvantna mehanika sama po sebi zadostovala za izpeljavo statistične mehanike brez dodatnih predpostavk. Ključni del te uganke je ugotoviti, kako lahko opazujemo stacionarne količine v izoliranem kvantnem sistemu. V tem delu smo pokazali, da so veččasovne pričakovane vrednosti v povprečju videti stacionarne v velikih sistemih, ko začetno stanje ni zelo natančno nastavljeno in ko je opazovano grobo v prostoru in času. To pomeni, da so ustrezne veččasovne značilnosti, kot je količina pomnilnika v kvantnem sistemu, na splošno neodvisne od natančnih preiskovanih časov.

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Navedel

[1] Philipp Strasberg, “Classicality with(out) decoherence: Concepts, relation to Markovianity, and a random matrix theory approach”, arXiv: 2301.02563, (2023).

[2] Philipp Strasberg, Teresa E. Reinhard in Joseph Schindler, "Everything Everywhere All At Once: A First Principles Numerical Demonstration of Emergent Decoherent Histories", arXiv: 2304.10258, (2023).

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