Qubit Protection in Nuclear-Spin Quantum Dot Memories

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Qubit Protection in Nuclear-Spin Quantum Dot Memories

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Title: Qubit Protection in Nuclear-Spin Quantum Dot Memories
Author: Kurucz, Z; Sørensen, M W; Taylor, Jacob Mason; Lukin, Mikhail D.; Fleischhauer, M

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Citation: Kurucz, Z., M.W. Sørensen, J.M. Taylor, M.D. Lukin, and M. Fleischhauer. 2009. Qubit protection in nuclear-spin quantum dot memories. Physical Review Letters 103(1): 010502.
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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 non-perfect initial spin polarization and inhomogeneous hyperfine coupling are discussed.
Published Version: doi:10.1103/PhysRevLett.103.010502
Other Sources: http://prl.aps.org/abstract/PRL/v103/i1/e010502
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:5345668
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