Impact of AC Magnetic Field on Decoherence of Quantum Dot based Single Spin Qubit System

TL;DR

This paper investigates how applying AC magnetic fields can suppress decoherence in quantum dot spin qubits, thereby extending the range of static magnetic fields for high-fidelity quantum operations.

Contribution

It introduces a model demonstrating that AC magnetic fields can effectively reduce decoherence, enhancing the operational stability of quantum dot spin qubits.

Findings

Increased usable static magnetic field range for qubit operations

AC magnetic fields suppress decoherence effects

Enhanced fidelity in quantum dot spin qubit systems

Abstract

Quantum dot-based spin qubits are resilient towards charge noise and are affected by magnetic noise only. However, environmental interaction leads to decoherence in these qubit systems. The external control parameters are directly related to the magnitude of decoherence. This in turn limits the range of values of those parameters for which operations can be done with high fidelity. In this work, using a model of quantum dot spin qubit system, we investigate the impact of varying ac magnetic fields on suppression of decoherence. We report an increment in the usable range of static magnetic field value using our technique.