Exponential rise of dynamical complexity in quantum computing through projections (Articolo in rivista)

Type
Label
  • Exponential rise of dynamical complexity in quantum computing through projections (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1038/ncomms6173 (literal)
Alternative label
  • Burgarth, Daniel Klaus[ 1 ] ; Facchi, Paolo[ 2,3 ] ; Giovannetti, Vittorio[ 4,5 ] ; Nakazato, Hiromichi[ 6 ] ; Pascazio, Saverio[ 2,3 ] ; Yuasa, Kazuya[ 6 ] (2014)
    Exponential rise of dynamical complexity in quantum computing through projections
    in Nature communications
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Burgarth, Daniel Klaus[ 1 ] ; Facchi, Paolo[ 2,3 ] ; Giovannetti, Vittorio[ 4,5 ] ; Nakazato, Hiromichi[ 6 ] ; Pascazio, Saverio[ 2,3 ] ; Yuasa, Kazuya[ 6 ] (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • [ 1 ] Aberystwyth Univ, Inst Math Phys & Comp Sci, Aberystwyth SY23 3BZ, Dyfed, Wales [ 2 ] Univ Bari, Dipartimento Fis & MECENAS, I-70126 Bari, Italy [ 3 ] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy [ 4 ] Scuola Normale Super Pisa, NEST, I-56126 Pisa, Italy [ 5 ] CNR, Ist Nanosci, I-56126 Pisa, Italy [ 6 ] Waseda Univ, Dept Phys, Tokyo 1698555, Japan (literal)
Titolo
  • Exponential rise of dynamical complexity in quantum computing through projections (literal)
Abstract
  • The ability of quantum systems to host exponentially complex dynamics has the potential to revolutionize science and technology. Therefore, much effort has been devoted to developing of protocols for computation, communication and metrology, which exploit this scaling, despite formidable technical difficulties. Here we show that the mere frequent observation of a small part of a quantum system can turn its dynamics from a very simple one into an exponentially complex one, capable of universal quantum computation. After discussing examples, we go on to show that this effect is generally to be expected: almost any quantum dynamics becomes universal once 'observed' as outlined above. Conversely, we show that any complex quantum dynamics can be 'purified' into a simpler one in larger dimensions. We conclude by demonstrating that even local noise can lead to an exponentially complex dynamics. (literal)
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