Observation of freezing phenomenon in high-dimensional quantum correlation dynamics

TL;DR

This paper demonstrates that high-dimensional quantum discord can exhibit a freezing phenomenon under local dephasing noise, indicating robustness and potential for quantum information processing.

Contribution

It reveals the freezing phenomenon of quantum discord in high-dimensional systems and introduces a geometric explanation for this robustness against noise.

Findings

Quantum discord shows a freezing phenomenon under dephasing noise.

Qutrits' discord outperforms qubits' discord in noisy environments.

A geometric model explains the freezing phenomenon.

Abstract

Quantum information processing (QIP) based on high-dimensional quantum systems provides unique advantages and new potentials where high-dimensional quantum correlations (QCs) play vital roles. Exploring the resistance of QCs against noises is crucial as QCs are fragile due to complex and unavoidable system-environment interactions. In this study, we investigate the performance of high-dimensional QCs under local dephasing noise using a single nitrogen-vacancy center in diamond. A freezing phenomenon in the high-dimensional quantum discord dynamics was observed, showing discord is robust against local dephasing noise. Utilizing a robustness metric known as freezing index, we found that the discord of qutrits outperforms their qubits counterpart when confronted with dephasing noise. Furthermore, we developed a geometric picture to explain this intriguing freezing phenomenon phenomenon. Our findings highlight the potential of utilizing discord as a physical resource for advancing QIP in high-dimensional quantum settings.