Qubit Protection in Nuclear-Spin Quantum Dot Memories
Name
Kurucz-2009-Qubit Protection in.pdf
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Author(s)
Taylor, J. M.
Sorensen, M. W.
Fleischhauer, M.
Lukin, M. D.
Kurucz, Z.
Date Issued
July 2009
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Kurucz, Z. et al. “Qubit Protection in Nuclear-Spin Quantum Dot Memories.” Physical Review Letters 103.1 (2009): 010502. © 2009 The American Physical Society.
Version
Final published version
Abstract
We present a mechanism to protect quantum information stored in an ensemble of nuclear spins in a semiconductor quantum dot. When the dot is charged the nuclei interact with the spin of the excess electron through the hyperfine coupling. If this coupling is made off-resonant, it leads to an energy gap between the collective storage states and all other states. We show that the energy gap protects the quantum memory from local spin-flip and spin-dephasing noise. Effects of nonperfect initial spin polarization and inhomogeneous hyperfine coupling are discussed.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.103.010502
