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Träfflista för sökning "L773:1063 777X ;pers:(Shumeiko Vitaly 1946)"

Sökning: L773:1063 777X > Shumeiko Vitaly 1946

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1.
  • Michelsen, Jens Harro, 1981, et al. (författare)
  • Nonadiabatic Josephson dynamics in junctions with in-gap quasiparticles
  • 2010
  • Ingår i: Low Temperature Physics. - : AIP Publishing. - 1063-777X .- 1090-6517. ; 36:10/11, s. 925-932 [1154-1162]-932
  • Tidskriftsartikel (refereegranskat)abstract
    • Conventional models of Josephson junction dynamics rely on the absence of low-energy quasiparticle states due to a large superconducting gap. With this assumption the quasiparticle degrees of freedom become «frozen out» and the phase difference becomes the only free variable, acting as a fictitious particle in a local in time Josephson potential related to the adiabatic and nondissipative supercurrent across the junction. In this article we develop a general framework to incorporate the effects of low-energy quasiparticles interacting nonadiabatically with the phase degree of freedom. Such quasiparticle states exist generically in constriction type junctions with high transparency channels or resonant states, as well as in junctions of unconventional superconductors. Furthermore, recent experiments have revealed the existence of spurious low-energy in-gap states in tunnel junctions of conventional superconductors — a system for which the adiabatic assumption typically is assumed to hold. We show that the resonant interaction with such low-energy states rather than the Josephson potential defines nonlinear Josephson dynamics at small amplitudes.
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2.
  • Shumeiko, Vitaly, 1946, et al. (författare)
  • Parametric Effects in Circuit Quantum Electrodynamics (Review Article)
  • 2019
  • Ingår i: Low Temperature Physics. - : AIP Publishing. - 1063-777X .- 1090-6517. ; 45:08, s. 995-1017
  • Forskningsöversikt (refereegranskat)abstract
    • We review recent advances in the research on quantum parametric phenomena in superconducting circuits with Josephson junctions. We discuss physical processes in parametrically driven tunable cavity and outline theoretical foundations for their description. Amplification and frequency conversion are discussed in detail for degenerate and non-degenerate parametric resonance, including quantum noise squeezing and photon entanglement. Experimental advances in this area played decisive role in successful development of quantum limited parametric amplifiers for superconducting quantum information technology. We also discuss nonlinear down-conversion processes and experiments on self-sustained parametric and subharmonic oscillations.
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3.
  • Wendin, Göran, 1942, et al. (författare)
  • Quantum bits with Josephson junctions
  • 2007
  • Ingår i: Low Temperature Physics. - : AIP Publishing. - 1063-777X .- 1090-6517. ; 33
  • Tidskriftsartikel (refereegranskat)abstract
    • Recent demonstrations of macroscopic quantum coherence in Josephson junction based electronic circuits have opened an entirely new dimension for research and applications in the established field of Josephson electronics. In this article we discuss basic Josephson circuits for qubit applications, methods of quantum description of these circuits, and circuit solutions for qubit couplings. Principles of manipulation and readout of superconducting qubits are reviewed and illustrated with recent experiments using various qubit types.
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  • Resultat 1-3 av 3
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tidskriftsartikel (2)
forskningsöversikt (1)
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refereegranskat (3)
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Wendin, Göran, 1942 (1)
Wustmann, Waltraut, ... (1)
Michelsen, Jens Harr ... (1)
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Chalmers tekniska högskola (3)
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Engelska (3)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (3)

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