Qubit Protection in Nuclear-Spin Quantum Dot Memories

Qubit Protection in Nuclear-Spin Quantum Dot Memories

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 g...

Full description

Bibliographic Details
Main Authors: Taylor, J. M. (Contributor), Sorensen, M. W. (Author), Fleischhauer, M. (Author), Lukin, M. D. (Author), Kurucz, Z. (Author)
Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor)
Format: Article
Language:English
Published: American Physical Society, 2010-02-17T16:44:23Z.
Subjects:
Article
Online Access:Get fulltext
Description
Summary: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.

Similar Items