Quantum computing based on space states without charge transfer

TL;DR

This paper proposes a quantum computing approach using space states in double quantum dots that avoids charge transfer, reducing decoherence and unwanted entanglement, and details how to perform all essential quantum operations.

Contribution

It introduces a charge-transfer-free quantum computing scheme in double quantum dots, minimizing decoherence and enabling complete quantum logic operations.

Findings

Charge transfer is eliminated during computation.

Uncontrollable entanglement due to Coulomb interaction is suppressed.

Decoherence from phonons and gates can be reduced.

Abstract

An implementation of a quantum computer based on space states in double quantum dots is discussed. There is no charge transfer in qubits during calculation, therefore, uncontrollable entan-glement between them due to long-range Coulomb interaction is suppressed. Other plausible sources of decoherence caused by interaction with phonons and gates could be substantially suppressed in the structure too. We also demonstrate how all necessary quantum logic operations, initialization, writing, and read-out could be carried out in the computer.