Nuclear spin population and its control toward initialization using an all-electrical sub-micron scale nuclear magnetic resonance device

TL;DR

This paper demonstrates the initialization and control of nuclear spin populations in a GaAs quantum well using an all-electrical NMR device, enabling the creation of two-qubit states for quantum computation.

Contribution

It introduces an all-electrical NMR device for nuclear spin control in a sub-micron region and shows how electron spin configurations influence nuclear spin populations.

Findings

Nuclear spins are polarized in a sub-micron region by the device.

Nuclear spin populations depend on electron spin states.

Two-qubit effective pure states are created via RF pulses.

Abstract

We study the nuclear spin population in a GaAs quantum well structure and demonstrate its initialization using an all-electrical nuclear magnetic resonance (NMR) device. In our device, nuclear spins are dynamically polarized in a sub-micron scale region defined by split gates. The nuclear spin populations under various polarization conditions are estimated from resistively-detected pulsed NMR spectra. We find that nuclear spin populations are determined by electron spin configurations. By applying radio frequency pulses to the strongly polarized nuclear spins, we demonstrate the creation of two-qubit effective pure states, which is a crucial step toward NMR quantum computation.