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Updated: Jun 21, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
Qubit protection in nuclear-spin quantum dot memories
Z Kurucz1, M W Sørensen, J M Taylor
1Fachbereich Physik, University of Kaiserslautern, D-67663 Kaiserslautern, Germany.
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.
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