Tuning the quantum tunneling and quantum information properties among the trion states in coupled quantum dots

TL;DR

This paper investigates how to control quantum tunneling and information properties of Coulomb-coupled trions in double quantum dots using time-dependent electric fields, revealing two types of qubits and their entanglement characteristics.

Contribution

It introduces a method to tune qubit properties in coupled quantum dots by adjusting Coulomb interactions and electric field parameters, highlighting new qubit constructions.

Findings

Two types of approximate qubits can be formed within the trion states.

The study elucidates the relationship between electron entanglement and Bell state overlap.

Control over quantum properties is achieved through tuning Hubbard interactions and electric field parameters.

Abstract

Quantum transition and information properties of the Coulomb coupled trion (electron-electron-hole) in the double quantum dots under the influence of the time-dependent electric field have been studied. Tuning the Hubbard interaction strength amongst the states of electron-hole complexes and the parameters of the ac field, two strikingly different kinds of approximate qubit can be constructed within the eight trion states. The similarity and difference between the electron dynamic entanglement and overlapping of the wavefunction with the Bell state have been elucidated through analyzing these two kinds of qubit.