Reversal of Photon-Scattering Errors in Atomic Qubits

TL;DR

This paper demonstrates that by leveraging information from scattered photons, it is possible to coherently reverse photon-scattering errors in atomic qubits, significantly improving quantum operation fidelity.

Contribution

The authors introduce a method to correct photon-scattering errors in atomic qubits by using photon information, achieving high correction fidelity.

Findings

Correction fidelity exceeds 85% when a photon is measured.

Photon information enables coherent reversal of scattering errors.

The approach improves quantum operation fidelity in atomic qubits.

Abstract

Spontaneous photon scattering by an atomic qubit is a notable example of environment-induced error and is a fundamental limit to the fidelity of quantum operations. In the scattering process the qubit loses its distinctive and coherent character owing to its entanglement with the photon. Using a single trapped ion we show that by utilizing the information carried by the photon we are able to coherently reverse this process and correct for the scattering error. We further used quantum process tomography to characterize the photon-scattering error and its correction scheme and demonstrate a correction fidelity greater than 85% whenever a photon was measured.