\"Quantum information transmission in quantum many-body systems\" (Tesi di Dottorato in Fisica) (Altro prodotto)

Type
Label
  • \"Quantum information transmission in quantum many-body systems\" (Tesi di Dottorato in Fisica) (Altro prodotto) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • Leonardo Banchi (candidato)[1,2]], Alessandro Cuccoli (corelatore)[1,2], Paola Verrucchi (relatore)[3,1,2] (2011)
    "Quantum information transmission in quantum many-body systems" (Tesi di Dottorato in Fisica)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Leonardo Banchi (candidato)[1,2]], Alessandro Cuccoli (corelatore)[1,2], Paola Verrucchi (relatore)[3,1,2] (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
  • Tesi di Dottorato in Fisica di Leonardo Banchi, vincitrice del Premio Fubini 2012 per la miglior tesi teorica dell'INFN. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • https://drive.google.com/file/d/0B6CpGzqRLR7HZ2NET0VlWGktX0k/view?usp=sharing (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 141 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • [1] Dipartimento di Fisica, Universita' di Firenze [2] Istituto Nazionale di Fisica Nucleare, sezione di Firenze [3] Istituto dei Sistemi Complessi, ISC-CNR (literal)
Titolo
  • \"Quantum information transmission in quantum many-body systems\" (Tesi di Dottorato in Fisica) (literal)
Abstract
  • This thesis is devoted to the study of many-body one-dimensional quantum systems as quantum wires, a recent intriguing topic which ranges between several branches of modern physics. A quantum wire is a communication channel between two quantum objects which preserves the quantum coherence. The interest in quantum communication channels has raised in recent years as novel experimental techniques permit to access and manipulate single quantum objects with extremely good precision and long coherence times, paving the way for the realization of a quantum computer, i.e., a device which exploits peculiar features of quantum mechanics for elaborating and processing information. Quantum entanglement is a fundamental resource, but it is responsible both for the power of quantum computers and for the difficulty of building them, being it very fragile. Therefore, it has become of utmost importance to understand what are the theoretical characteristics that a quantum channel must possess for reliably transfer information between distant parts preserving all the relevant quantum features, notably entanglement. Although flying quantum systems, e.g. photons in optical fibers, can be used as quantum information carriers, in this thesis we focus on wires composed of localized quantum systems, statically interacting with their (nearest) neighbours: the transmission occurs by the coherent collective dynamics of the components. This scheme is suitable for short distance quantum communications, as those occurring between quantum processing units in a quantum computer, since the wire can be fabricated with the same localized objects of the processing units themselves. Many-body quantum wires have a generally rich and complex dynamics with lots of different effects, as the spreading of the wave-function between different sites or the scattering between the elementary excitations. We have analysed several models, with a special emphasis on spin- 1/2 chains, though our arguments can be applied with little effort to other many-body systems, such as chains of (Majorana) fermions or excitonic systems. Moreover, we have devised a recipe for inducing a coherent ballistic dynamics in systems described by Hamiltonians mappable to free-models with some suitable transformation, and we have applied it to different cases and models. Thanks to our recipe the information flows coherently through the one-dimensional wire, allowing a fast high-quality transmission of states and entanglement even in the limit of infinite sites, i.e., in principle, over macroscopic distances. Furthermore, the coherent ballistic information flow entails an effective interaction between distant parts, and can thus be used to dynamically generate long-distance entanglement in a fast and scalable way compared to previous proposals. (literal)
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