Spin flip locking by the tunneling and relaxation in a driven double quantum dot with spin-orbit coupling

TL;DR

This paper investigates how spin flip locking occurs in a driven double quantum dot with spin-orbit coupling, revealing conditions for long-lived spin states useful for quantum information processing.

Contribution

It introduces a model combining spin, charge, relaxation, and decoherence effects in a driven double quantum dot, demonstrating spin flip locking due to specific relaxation regimes.

Findings

Fast coordinate relaxation with slow spin relaxation enables long-lived spin states.

Spin flip locking persists over a wide range of relaxation times and driving amplitudes.

The effect is observable at higher subharmonics with lower driving frequencies.

Abstract

Coupled spin evolution and tunneling together with the relaxation and decoherence effects are studied for the double quantum dot formed in a semiconductor nanowire and driven by the periodic electric field. Such system represents a model of the spin and charge qubits interacting via the strong spin-orbit coupling. It is found that at certain regimes the combination of fast relaxation in the coordinate channel with the slower relaxation in the spin channel leads to the promising combination of fast spin manipulation and slow spin relaxation, locking the flipped spin in an excited state in one of the dots for a sufficiently long time. The predicted effect is maintained for a wide range of the relaxation times and the driving amplitude both for the coordinate and the spin channels and is also observed on higher subharmonic which requires lower driving frequencies.