Suppression of Hyperfine Dephasing by Spatial Exchange of Double Quantum Dots

Abstract

We examine the logical qubit system of a pair of electron spins in double quantum dots. Each electron experiences a different hyperfine interaction with the local nuclei of the lattice, leading to a relative phase difference, and thus decoherence. Methods such as nuclei polarization, state narrowing, and spin-echo pulses have been proposed to delay decoherence. Instead we propose to suppress hyperfine dephasing by adiabatic rotation of the dots in real space, leading to the same average hyperfine interaction. We show that the additional effects due to the motion in the presence of spin-orbit coupling are still smaller than the hyperfine interaction, and result in an infidelity below 10^{-4} after ten decoupling cycles. We discuss a possible experimental setup and physical constraints for this proposal.

8 pages, 4 figures

References in corpus (6)

• Fault-Tolerant Quantum Dynamical Decoupling
• Coherent spin manipulation in an exchange-only qubit
• Conditional operation of a spin qubit
• Cubic Dresselhaus Spin-Orbit Coupling in 2D Electron Quantum Dots
• Dynamical control of electron spin coherence in a quantum dot
• Manipulation of two spin qubits in a double quantum dot using an electric field