Chapter 19. Quantum Computing and Quantum Measurement with Mesoscopic Josephson Junctions

  1. Prof. Dr. Samuel L. Braunstein2,
  2. Dr. Hoi-Kwong Lo3 and
  3. Pieter Kok Assistant Editor2
  1. D. V. Averin

Published Online: 28 JAN 2005

DOI: 10.1002/3527603182.ch19

Scalable Quantum Computers: Paving the Way to Realization

Scalable Quantum Computers: Paving the Way to Realization

How to Cite

Averin, D. V. (2000) Quantum Computing and Quantum Measurement with Mesoscopic Josephson Junctions, in Scalable Quantum Computers: Paving the Way to Realization (eds S. L. Braunstein, H.-K. Lo and P. Kok), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527603182.ch19

Editor Information

  1. 2

    University of Wales, Bangor, UK

  2. 3

    MagiQ Technologies, Inc., New York, USA

Author Information

  1. Department of Physics and Astronomy, SUNY at Stony Brook, Stony Brook, NY 11794-3800, USA

Publication History

  1. Published Online: 28 JAN 2005
  2. Published Print: 20 DEC 2000

ISBN Information

Print ISBN: 9783527403219

Online ISBN: 9783527603183

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Keywords:

  • quantum computation;
  • quantum computing;
  • quantum measurement;
  • mesoscopic Josephson junctions;
  • Josephson tunneling

Summary

Recent experimental demonstrations of quantum coherence of the charge and flux states of Josephson junctions show that the quantum Josephson dynamics can be used to develop scalable quantum logic circuits. In this work, I review the basic concepts of Josephson tunneling and Josephson-junction qubits, and discuss two problems of this tunneling motivated by quantum computing applications. One is the theory of photon-assisted resonant flux tunneling in SQUID systems used to demonstrate quantum coherence of flux. Another is the problem of quantum measurement of charge with the SET electrometer. It is shown that the SET electrometer at the Coulomb blockade threshold is the quantum-limited detector with energy sensitivity reaching ħ/√3 in the resonant-tunneling regime.