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Measurement, control, and decay of quantum‐dot spins
Author(s) -
Coish W. A.,
Golovach Vitaly N.,
Egues J. Carlos,
Loss Daniel
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200642348
Subject(s) - quantum decoherence , physics , spins , quantum mechanics , quantum dot , quantum computer , open quantum system , quantum technology , spin (aerodynamics) , electron , parity (physics) , quantum , condensed matter physics , thermodynamics
In this review we discuss a recent proposal to perform partial Bell‐state (parity) measurements on two‐electron spin states for electrons confined to quantum dots. The realization of this proposal would allow for a physical implementation of measurement‐based quantum computing. In addition, we consider the primary sources of energy relaxation and decoherence which provide the ultimate limit to all proposals for quantum information processing using electron spins in quantum dots. We give an account of the Hamiltonians used for the most important interactions (spin–orbit and hyperfine) and survey some of the recent work done to understand dynamics, control, and decoherence under the action of these Hamiltonians. We conclude the review with a table of important decay times found in experiment, and relate these time scales to the potential viability of measurement‐based quantum computing. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)