Decoherence times of universal two-qubit gates in the presence of broad-band noise (Articolo in rivista)

Type
Label
  • Decoherence times of universal two-qubit gates in the presence of broad-band noise (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/1367-2630/13/9/093037 (literal)
Alternative label
  • Paladino, E.; D'Arrigo, A.; Mastellone, A.; Falci, G. (2011)
    Decoherence times of universal two-qubit gates in the presence of broad-band noise
    in New journal of physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Paladino, E.; D'Arrigo, A.; Mastellone, A.; Falci, G. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 13 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 34 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • University of Catania; CNR IMM MATIS; CIRA (literal)
Titolo
  • Decoherence times of universal two-qubit gates in the presence of broad-band noise (literal)
Abstract
  • The controlled generation of entangled states of two quantum bits is a fundamental step toward the implementation of a quantum information processor. In nano-devices this operation is counteracted by the solid-state environment, characterized by a broadband and non-monotonic power spectrum, often 1/f, at low frequencies. For single-qubit gates, incoherent processes due to fluctuations acting on different time scales result in peculiar short-and longtime behavior. Markovian noise gives rise to exponential decay with relaxation and decoherence times, T(1) and T(2), simply related to the symmetry of the qubit-environment coupling Hamiltonian. Noise with the 1/f power spectrum at low frequencies is instead responsible for defocusing processes and algebraic short-time behavior. In this paper, we identify the relevant decoherence times of an entangling operation due to the different decoherence channels originating from solid-state noise. Entanglement is quantified by concurrence, which we evaluate in an analytic form employing a multi-stage approach. The 'optimal' operating conditions of reduced sensitivity to noise sources are identified. We apply this analysis to a superconducting root i-SWAP gate for experimental noise spectra. (literal)
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