Asenbeck Beate E, Lachman Lukáš, Boyer Ambroise, Giri Priyanka, Urvoy Alban, Filip Radim, Laurat Julien
Sorbonne Université, Laboratoire Kastler Brossel, CNRS, ENS-Université PSL, Collège de France, 4 Place Jussieu, 75005 Paris, France.
Palacký University, Department of Optics, 17. Listopadu 12, 771 46 Olomouc, Czech Republic.
Phys Rev Lett. 2025 Jun 13;134(23):233604. doi: 10.1103/PhysRevLett.134.233604.
Non-Gaussianity, a distinctive characteristic of bosonic quantum states, is pivotal in advancing quantum networks, fault-tolerant quantum computing, and high-precision metrology. Verifying the quantum nature of a state, particularly its non-Gaussian features, is essential for ensuring the reliability and performance of these technologies. However, the specific properties required for each application demand tailored validation thresholds. Here, we introduce a hierarchical framework comprising absolute, relative, and qubit-specific thresholds to assess the non-Gaussianity of local coherences. We illustrate this framework using heralded optical non-Gaussian states with the highest purities available in optical platforms. This comprehensive framework presents the first detailed evaluation of number state coherences and can be extended to a wide range of bosonic states.
非高斯性是玻色子量子态的一个显著特征，在推进量子网络、容错量子计算和高精度计量学方面起着关键作用。验证一个态的量子性质，特别是其非高斯特征，对于确保这些技术的可靠性和性能至关重要。然而，每个应用所需的特定属性需要定制的验证阈值。在这里，我们引入了一个包含绝对、相对和量子比特特定阈值的分层框架，以评估局部相干性的非高斯性。我们使用光学平台中纯度最高的预测量子光学非高斯态来说明这个框架。这个综合框架首次对数字态相干性进行了详细评估，并且可以扩展到广泛的玻色子态。
