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Quantum Computing and Quantum Measurement with Mesoscopic Josephson Junctions
Author(s) -
Averin D.V.
Publication year - 2000
Publication title -
fortschritte der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.469
H-Index - 71
eISSN - 1521-3978
pISSN - 0015-8208
DOI - 10.1002/1521-3978(200009)48:9/11<1055::aid-prop1055>3.0.co;2-1
Subject(s) - mesoscopic physics , josephson effect , physics , quantum , pi josephson junction , josephson phase , josephson energy , superconducting tunnel junction , quantum computer , quantum mechanics , condensed matter physics , superconductivity
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.