Rabi oscillations, coherent properties and model qubits in two-level donor systems under terahertz radiation

TL;DR

This paper provides a detailed theoretical analysis of Rabi oscillations and coherent control of donor-based qubits in GaAs under terahertz radiation, highlighting conditions for minimal decoherence and effective quantum manipulation.

Contribution

It offers a comprehensive theoretical model of damped Rabi oscillations and qubit dynamics in donor systems, guiding experimental setups for quantum computing applications.

Findings

Identification of conditions for weak decoherence

Modeling of time evolution of donor states

Analysis of photocurrent influence on qubit control

Abstract

Quantum confinement, magnetic-field effects, and laser coupling with the two low-lying states of electrons bound to donor impurities in semiconductors may be used to coherently manipulate the two-level donor system in order to establish the appropriate operational conditions of basic quantum bits (qubits) for solid-state based quantum computers. Here we present a detailed theoretical calculation of the damped Rabi oscillations and time evolution of the 1s and 2p+ donor states in bulk GaAs under an external magnetic field and in the presence of terahertz laser radiation, and their influence on the measured photocurrent. We also detail the possible experimental conditions under which decoherence is weak and qubit operations are efficiently controlled.