Curator's Take
AI Commentary
This article tackles a gap in the literature by charting how basis‑independent (intrinsic) coherence—rather than the more commonly studied basis‑dependent version—evolves in three‑qubit systems under realistic dephasing noise, showing that collective and non‑Markovian environments can dramatically slow or even freeze its decay. By demonstrating that decoherence‑free sectors and memory effects preserve intrinsic multipartite coherence far better than traditional measures predict, the work points to new strategies for protecting quantum resources in noisy intermediate‑scale devices. The findings complement recent advances in dynamical decoupling and error mitigation, suggesting that targeting basis‑independent coherence could be a practical route toward more robust quantum processors, though experimental validation will be needed to confirm the predicted freezing behavior.
— Mark Eatherly
Summary
Quantum coherence is a fundamental quantum resource whose preservation under environmental interactions is essential for quantum information processing. While most studies have focused on basis-dependent coherence measures, the dynamics of intrinsic coherence quantified by basis-independent measures remain largely unexplored. In this work, we investigate the dynamics of basis-independent quantum coherence for several representative tripartite pure and mixed states subjected to local and common dephasing environments in both Markovian and non-Markovian regimes. We show that Markovian local dephasing leads to state-dependent coherence degradation, whereas collective dephasing significantly enhances coherence preservation through decoherence-free sectors. More importantly, non-Markovian environments give rise to nearly frozen coherence dynamics for both pure and mixed states, demonstrating the remarkable robustness of intrinsic coherence against dephasing environment. A comparison with the measure of relative entropy of coherence reveals that basis-independent coherence measure exhibits substantially greater resilience and qualitatively different dynamical behaviour than its basis-dependent counterpart. These results provide new insights into the preservation of intrinsic multipartite coherence in open quantum systems and highlight basis-independent coherence as a robust quantum resource for realistic noisy quantum technologies.