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Long-lifetime coherent storage for microwave photons in the magnomechanical resonator 磁机械谐振器中微波光子的长寿命相干存储
Pub Date : 2023-11-27 DOI: 10.1007/s44214-023-00044-y
Guan-Ting Xu, Yu Wang, Mai Zhang, Zhen Shen, Xi-Feng Ren, Guang-Can Guo, Chun-Hua Dong

The storage of quantum states and information is essential for enabling large quantum networks. The direct implementation of storage in magnonic systems, which are emerging as crucial components in quantum networks, has also garnered attention. In this study, we present experimental investigations of magnomechanical microwave storage for the first time. By reducing the ambient temperature to 8 K, we can achieve a mechanical mode with a narrow linewidth as low as 6.4 Hz, resulting in an energy decay time of 24.8 ms. Furthermore, we employ Ramsey interferometry to investigate the coherence of the magnomechanical memory. The mechanical interference can be utilized to evaluate the decoherence lifetime of 19.5 ms. Our proposed scheme provides the potential to utilize magnomechanical systems as quantum memory for photonic quantum information.

量子态和信息的存储对于实现大型量子网络至关重要。作为量子网络的关键组成部分,磁系统存储的直接实现也引起了人们的关注。在这项研究中,我们首次对磁机械微波存储进行了实验研究。通过将环境温度降低到8 K,我们可以实现线宽低至6.4 Hz的机械模式,导致能量衰减时间为24.8 ms。此外,我们采用拉姆齐干涉测量法来研究磁机械记忆的相干性。机械干扰可以用来评估19.5 ms的退相干寿命。我们提出的方案提供了利用磁力学系统作为光子量子信息的量子存储器的潜力。
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引用次数: 0
1002 km twin-field quantum key distribution with finite-key analysis 1002公里双场量子密钥分布与有限密钥分析
Pub Date : 2023-11-24 DOI: 10.1007/s44214-023-00039-9
Yang Liu, Wei-Jun Zhang, Cong Jiang, Jiu-Peng Chen, Di Ma, Chi Zhang, Wen-Xin Pan, Hao Dong, Jia-Min Xiong, Cheng-Jun Zhang, Hao Li, Rui-Chun Wang, Chao-Yang Lu, Jun Wu, Teng-Yun Chen, Lixing You, Xiang-Bin Wang, Qiang Zhang, Jian-Wei Pan

Quantum key distribution (QKD) holds the potential to establish secure keys over long distances. The distance of point-to-point QKD secure key distribution is primarily impeded by the transmission loss inherent to the channel. In the quest to realize a large-scale quantum network, increasing the QKD distance under current technology is of great research interest. Here we adopt the 3-intensity sending-or-not-sending twin-field QKD (TF-QKD) protocol with the actively-odd-parity-pairing method. The experiment demonstrates the feasibility of secure QKD over a 1002 km fibre channel considering the finite size effect. The secure key rate is (3.11times 10^{-12}) per pulse at this distance. Furthermore, by optimizing parameters for shorter fiber distances, we conducted performance tests on key distribution for fiber lengths ranging from 202 km to 505 km. Notably, the secure key rate for the 202 km, the normal distance between major cities, reached 111.74 kbps.

量子密钥分发(QKD)具有在长距离上建立安全密钥的潜力。点对点QKD安全密钥分发的距离主要受到信道固有的传输损耗的阻碍。在实现大规模量子网络的过程中,在现有技术条件下增加量子密钥分配距离具有重要的研究意义。本文采用主动奇偶配对方法的3强度发送或不发送双域QKD (TF-QKD)协议。实验证明了在考虑有限尺寸效应的1002 km光纤通道上安全量子密钥分配的可行性。在此距离上,安全密钥速率为每脉冲(3.11times 10^{-12})。此外,通过优化较短光纤距离的参数,我们对光纤长度从202公里到505公里的关键分布进行了性能测试。特别是,主要城市之间的正常距离202公里的安全密钥速率达到了111.74 kbps。
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引用次数: 0
Adversarial machine learning phases of matter 对抗性的机器学习阶段
Pub Date : 2023-11-22 DOI: 10.1007/s44214-023-00043-z
Si Jiang, Sirui Lu, Dong-Ling Deng

We study the robustness of machine learning approaches to adversarial perturbations, with a focus on supervised learning scenarios. We find that typical phase classifiers based on deep neural networks are extremely vulnerable to adversarial perturbations: adding a tiny amount of carefully crafted noises into the original legitimate examples will cause the classifiers to make incorrect predictions at a notably high confidence level. Through the lens of activation maps, we find that some important underlying physical principles and symmetries remain to be adequately captured for classifiers with even near-perfect performance. This explains why adversarial perturbations exist for fooling these classifiers. In addition, we find that, after adversarial training the classifiers will become more consistent with physical laws and consequently more robust to certain kinds of adversarial perturbations. Our results provide valuable guidance for both theoretical and experimental future studies on applying machine learning techniques to condensed matter physics.

我们研究了机器学习方法对对抗性扰动的鲁棒性,重点是监督学习场景。我们发现基于深度神经网络的典型相位分类器非常容易受到对抗性扰动的影响:在原始的合法示例中添加少量精心制作的噪声将导致分类器在非常高的置信度下做出错误的预测。通过激活图的镜头,我们发现一些重要的潜在物理原理和对称性仍然需要充分捕捉到具有近乎完美性能的分类器。这就解释了为什么存在对抗性扰动来欺骗这些分类器。此外,我们发现,经过对抗性训练,分类器将变得更加符合物理定律,因此对某些类型的对抗性扰动更具鲁棒性。我们的研究结果为未来将机器学习技术应用于凝聚态物理的理论和实验研究提供了有价值的指导。
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引用次数: 4
Infinite critical boson non-Fermi liquid on heterostructure interfaces 异质结构界面上的无限临界玻色子非费米液体
Pub Date : 2023-11-17 DOI: 10.1007/s44214-023-00040-2
Xiao-Tian Zhang, Gang Chen

We study the emergence of non-Fermi liquid on heterostructure interfaces where there exists an infinite number of critical boson modes accounting for the magnetic fluctuations in two spatial dimensions. The interfacial Dzyaloshinskii-Moriya interaction naturally arises in magnetic interactions due to the absence of inversion symmetry, resulting in a degenerate contour for the low-energy bosonic modes in the momentum space which simultaneously becomes critical near the magnetic phase transition. The itinerant electrons are scattered by the critical boson contour via the Yukawa coupling. When the boson contour is much smaller than the Fermi surface, it is shown that, there exists a regime with a dynamic critical exponent ({z=3}) while the boson contour still controls the low-energy magnetic fluctuations. Using a self-consistent renormalization calculation for this regime, we uncover a prominent non-Fermi liquid behavior in the resistivity with a characteristic temperature scaling power. These findings open up new avenues for understanding boson-fermion interactions and the novel fermionic quantum criticality.

我们研究了异质结构界面上出现的非费米液体,在这些界面上存在着无限多的临界玻色子模式,它们在两个空间维度上代表着磁波动。由于不存在反转对称性,界面上的 Dzyaloshinskii-Moriya 相互作用自然会在磁相互作用中产生,从而导致动量空间中的低能玻色子模式出现退化轮廓,并同时在磁相变附近成为临界。巡回电子通过尤卡娃耦合被临界玻色子轮廓散射。研究表明,当玻色子轮廓远小于费米面时,存在一个动态临界指数(({z=3})的体系,而玻色子轮廓仍然控制着低能磁波动。通过对这一机制的自洽重正化计算,我们在电阻率中发现了一种突出的非费米液体行为,具有温度缩放功率的特征。这些发现为理解玻色子-费米子相互作用和新型费米量子临界性开辟了新途径。
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引用次数: 0
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Quantum Frontiers
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