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Time evolution of an infinite projected entangled pair state : an algorithm from first principles
A typical quantum state obeying the area law for entanglement on an infinite two-dimensional (2D) lattice can be represented by a tensor network Ansatz, known as an infinite projected entangled pair state (iPEPS), with a finite bond dimension D . Its real-imaginary time evolution can be split into small time steps. An application of a time step generates a new iPEPS with a bond dimension k times the original one. The new iPEPS does not make optimal use of its enlarged bond dimension k D ; hence, in principle, it can be represented accurately by a more compact Ansatz, preferably with the original D . In this work we show how the more compact iPEPS can be optimized variationally to maximize its overlap with the new iPEPS. To compute the overlap we use the corner-transfer-matrix renormalization group. By simulating sudden quench of the transverse field in the 2D quantum Ising model with the proposed algorithm, we provide a proof of principle that real-time evolution can be simulated with iPEPS. A similar proof is provided with the same model for imaginary-time evolution of purification of its thermal states.
cris.lastimport.scopus | 2024-04-24T06:16:33Z | |
cris.lastimport.wos | 2024-04-10T02:03:50Z | |
dc.abstract.en | A typical quantum state obeying the area law for entanglement on an infinite two-dimensional (2D) lattice can be represented by a tensor network Ansatz, known as an infinite projected entangled pair state (iPEPS), with a finite bond dimension D . Its real-imaginary time evolution can be split into small time steps. An application of a time step generates a new iPEPS with a bond dimension k times the original one. The new iPEPS does not make optimal use of its enlarged bond dimension k D ; hence, in principle, it can be represented accurately by a more compact Ansatz, preferably with the original D . In this work we show how the more compact iPEPS can be optimized variationally to maximize its overlap with the new iPEPS. To compute the overlap we use the corner-transfer-matrix renormalization group. By simulating sudden quench of the transverse field in the 2D quantum Ising model with the proposed algorithm, we provide a proof of principle that real-time evolution can be simulated with iPEPS. A similar proof is provided with the same model for imaginary-time evolution of purification of its thermal states. | pl |
dc.affiliation | Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego | pl |
dc.contributor.author | Czarnik, Piotr | pl |
dc.contributor.author | Dziarmaga, Jacek - 127850 | pl |
dc.date.accessioned | 2018-08-29T13:42:17Z | |
dc.date.available | 2018-08-29T13:42:17Z | |
dc.date.issued | 2018 | pl |
dc.description.number | 4 | pl |
dc.description.volume | 98 | pl |
dc.identifier.articleid | 045110 | pl |
dc.identifier.doi | 10.1103/PhysRevB.98.045110 | pl |
dc.identifier.eissn | 2469-9969 | pl |
dc.identifier.issn | 2469-9950 | pl |
dc.identifier.project | ROD UJ / O | pl |
dc.identifier.uri | https://ruj.uj.edu.pl/xmlui/handle/item/56531 | |
dc.language | eng | pl |
dc.language.container | eng | pl |
dc.rights | Dodaję tylko opis bibliograficzny | * |
dc.rights.licence | bez licencji | |
dc.rights.uri | * | |
dc.subtype | Article | pl |
dc.title | Time evolution of an infinite projected entangled pair state : an algorithm from first principles | pl |
dc.title.journal | Physical Review. B | pl |
dc.type | JournalArticle | pl |
dspace.entity.type | Publication |