近日，澳大利亚麦考瑞大学的Zixin Huang与意大利巴里理工大学的Cosmo Lupo合作并取得一项新进展。经过不懈努力，他们通过干涉测量实现量子传感误差过滤。相关研究成果已于2024年11月21日在国际知名学术期刊《物理评论A》上发表。

本文讨论了一种用于光学量子计量中缓解失相影响的硬件误差过滤方案。该方案仅使用被动线性光学元件和辅助真空模式，无需单光子源或纠缠态。它利用建设性干涉和破坏性干涉，来部分抵消统计独立失相源的有害影响。

研究人员将此方案应用于保持相干态和相位稳定恒星干涉测量，结果表明，仅需使用少量辅助模式即可获得显著改进。

据悉，失相是影响量子信息的主要噪声机制，它会降低可见度，并破坏相干性和纠缠态。因此，必须减少、缓解失相，并尽可能地进行校正，以便在从计算到传感和通信等任何量子技术应用中展示量子优势。

附：英文原文

Title: Error filtration for quantum sensing via interferometry

Author: Zixin Huang, Cosmo Lupo

Issue&Volume: 2024/11/21

Abstract: Dephasing is a main noise mechanism that afflicts quantum information, it reduces visibility, and destroys coherence and entanglement. Therefore, it must be reduced, mitigated, and, if possible, corrected to allow for demonstration of quantum advantage in any application of quantum technology, from computing to sensing and communications. Here we discuss a hardware scheme of error filtration to mitigate the effects of dephasing in optical quantum metrology. The scheme uses only passive linear optics and ancillary vacuum modes, without need of single-photon sources or entanglement. It exploits constructive and destructive interference to partially cancel the detrimental effects of statistically independent sources of dephasing. We apply this scheme to preserve coherent states and to phase stabilize stellar interferometry, showing that a significant improvement can be obtained by using only a few ancillary modes.

DOI: 10.1103/PhysRevA.110.052431

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.052431