Partly noiseless encoding of quantum information in quantum dot arrays against phonon-induced pure dephasing

TL;DR

This paper proposes a method to reduce pure dephasing in quantum dot charge qubits by encoding information across an array of dots, considering array size, structure, and exciton lifetime effects.

Contribution

It introduces a partly noiseless encoding scheme in quantum dot arrays that mitigates phonon-induced pure dephasing during slow quantum gate operations.

Findings

Encoding in quantum dot arrays reduces dephasing errors.

Array size and structure influence error rates.

Longer exciton lifetimes improve qubit coherence.

Abstract

We show that pure dephasing of a quantum dot charge (excitonic) qubit may be reduced for sufficiently slow gating by collectively encoding quantum information in an array of quantum dots. We study the role of the size and structure of the array and of the exciton lifetime for the resulting total error of a single-qubit operation.