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Josephson Junction based Quantum Computing

  • Yuriy Makhlin
  • Gerd Schön
  • Alexander Shnirman

Abstract.

Among the physical realizations of the elements required for quantum computation nano-scale electronic devices [2, 10, 12, 16] are very promising. They can be easily integrated into electronic circuits and scaled up to large numbers of qubits. Here we describe qubits based on low-capacitance Josephson junctions. In these systems Coulomb blockade effects allow the control of the charge on a superconducting island. They constitute quantum bits, with logical states differing by the charge on one island. Single- and two-bit operations can be performed by manipulating applied gate voltages. The phase coherence time is sufficiently long to allow a series of these steps. In addition to the manipulation of qubits, the resulting quantum state can be read out by coupling a single-electron transistor capacitively to the qubit.

Key words: Quantum bit, Josephson junction, Single-electron transistor, Quantum measurement. 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Yuriy Makhlin
    • 1
  • Gerd Schön
    • 1
  • Alexander Shnirman
    • 2
  1. 1.Institut für Theoretische Festkörperphysik, Universität Karlsruhe, 76128 Karlsruhe, GermanyDE
  2. 2.Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USAUS

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