Qubit protection in nuclear-spin quantum dot memories

Details Qubit protection in nuclear-spin quantum dot memories Qubit protection in nuclear-spin quantum dot memories

2009-02-26

arxiv.org/abs/0902.4566v1

Phys. Rev. Lett. 103, 010502 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.103.010502

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.

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