MEASUREMENT OF THE EFFECTIVE DISSIPATION IN AN-RF SQUID SYSTEM (Articolo in rivista)

Type
Label
  • MEASUREMENT OF THE EFFECTIVE DISSIPATION IN AN-RF SQUID SYSTEM (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • Ruggiero B.1, Corato V.1, Granata C.1, Longobardi L.1, Rombetto S.1, Silvestrini P.2 (2003)
    MEASUREMENT OF THE EFFECTIVE DISSIPATION IN AN-RF SQUID SYSTEM
    (literal)
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  • Ruggiero B.1, Corato V.1, Granata C.1, Longobardi L.1, Rombetto S.1, Silvestrini P.2 (literal)
Pagina inizio
  • 132504 (literal)
Pagina fine
  • 132506 (literal)
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  • In this paper we present an experimental study on the effective dissipation relevant in the decay from the metastable state of a fully integrated Nb/AlOx/Nb Josephson device consisting of a rf SQUID coupled via a gradiometric flux transformer to a readout system based on a dc SQUID sensor. The low dissipation level due to the good insulation of the probe from the external noise are encouraging in view of building a macroscopic quantum device. Furthermore we use large Josephson junctions whose properties in a complex superconducting integrated circuits are well established and this can be useful in designing a quantum bit. (literal)
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  • 64 (literal)
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  • PACS numbers: 74.50+r, 3.65.-w, 3.65.Yz, 03.67.Lx (literal)
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  • A new scenario in the field of devices for the quantum computation1 has been opened by spectroscopy experiments on Josephson systems in the last years. Evidence of superposition of macroscopically distinct flux quantum state or persistent-current states in Superconducting Quantum Interference Device (SQUID) systems as well as the observation of Rabi oscillations between macroscopic quantum states in Josephson tunnel junctions, in a large Josephson-junction device or in a “Quantronium” circuit, have been recently published. Furthermore we produce new energies in studies on the superconducting architecture for adiabatic quantum computation and on special-designed superconducting devices to realize quantum gates by adiabatic operations. All these efforts confirm the hope that Josephson systems can be scaled to a full quantum computer through integrated-circuit technology, but the realization of a quantum computer will depend critically on the ability of researchers to create and preserve coherent superposition states which represents a fundamental goal.The decoherence time is determined by temperature as well as by the effective dissipation parameter. (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • 1 Istituto di Cibernetica “E. Caianiello” del CNR, I-80078 Pozzuoli, Italy 2 Seconda Università di Napoli, Dipartimento di Ingegneria dell’Informazione, I-81031, Aversa, Italy and Istituto di Cibernetica “E. Caianiello” del CNR, I-80078 Pozzuoli, Italy (literal)
Titolo
  • MEASUREMENT OF THE EFFECTIVE DISSIPATION IN AN-RF SQUID SYSTEM (literal)
Abstract
  • We present an experimental study of the effective dissipation of a fully integrated Nb/AlOx/Nb Josephson device consisting of a rf SQUID coupled to a readout system based on a dc SQUID sensor. In the classical regime data on the decay rate from the metastable flux states of rf SQUID are reported. The low dissipation level and the good insulation of the probe from the external noise are encouraging in view of building a macroscopic quantum device. (literal)
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