Annalen der Physik最新文献

Entanglement and Perfect One-Way EPR Steering in Cavity Magnonics System

In article number 2400307, Qi Guo and co-workers demonstrate that, for a cross-shaped cavity magnonics system, both the bipartite and tripartite entanglement, and the perfect one-way Einstein–Podolsky–Rosen (EPR) steering can be generated through the Kerr nonlinearity. Especially, different from the conventional protocols introducing additional unbalanced losses or noises, the presented scheme can manipulate the perfect one-way EPR steering only by adjusting the drive detuning. Therefore, the scheme provides a new insight for producing asymmetric EPR steering.

Topological Nodal-Line Semimetal PbTaSe₂

A thermally induced structural phase transition and surface phonons are evidenced in the nodal-line semimetal PbTaSe₂ by a comprehensive investigation of temperature-dependent Raman and single-crystal X-ray diffraction measurements, supported by density functional theory-based phonon calculation. This behavior is ascribed to the intricate interaction between surface topology and the dynamics of the underlying lattice, as illustrated in the cover image. The results obtained by Vivek Kumar and Pradeep Kumar (see article number 2400277) present new challenges and opportunities in the domain of future quantum materials.

Evolution of Metasurface Devices

This concept visualizes the evolution of metasurface devices, from single-layered meta-atom to cascaded meta-atoms, then to spatially cascaded metasurfaces, gradually realizing multiple and complex functions, including the novel diffractive deep neural networks. The cover artwork aims to illustrate the progress of metasurface design, highlighting the novel properties and applications brought by the evolution of physical structures. It serves as a representation of the innovative research and interdisciplinary connections showcased in the Review by Ying Han Wang, Cheng Pang, Yuzhong Wang, and Jiaran Qi (article number 2400158).

Kirigami/Origami Metasurfaces for Controlling Electromagnetic Waves

Kirigami and origami provide versatile spatial deformations in the design of reconfigurable metasurfaces, leading to various applications in deployable devices. In article number 2400213, Yilin Zheng, Ke Chen, and Yijun Feng provide an overview highlighting the implementations of kirigami/origami metasurfaces and their applications in controlling electromagnetic waves.

Wu et al. [J. High Energ. Phys. 2023, 232 (2023)] first found that the fidelity of quantum teleportation with a bipartite entangled resource state, completely determined by the fully entangled fraction (FEF) characterized by the maximal fidelity between the given quantum state and the set of maximally entangled states, can monotonically increase in Schwarzschild spacetime. The Hawking effect on the FEF of quantum states in tripartite systems is investigated. In this study, it is showed that the Hawking effect of a black hole may both decrease and increase the FEF in Schwarzschild spacetime. For an initial X-type state, it is found that the Hawking effect of the black hole has both positive and negative impacts on the FEF of Dirac fields, depending on the selection of initial states. For an initial W-like state, the Hawking effect of the black hole has only a positive impact on the FEF of Dirac fields, independent of the selection of initial states. These results provide an insightful view of quantum teleportation in multipartite systems under the influence of Hawking effects, from the perspective of quantum information and general relativity.

This research explores the effects of decoherence on local quantum Fisher information and quantum coherence dynamics in a spin-1/2 Ising-XYZ chain model with independent reservoirs at zero temperature. Contrasting these effects with those in the spin-1/2 Heisenberg XYZ model reveals intricate interactions among quantum coherence, entanglement, and environmental decoherence in spin systems. Analysis of coherence dynamics highlights differences between the original and hybrid models, showcasing increased entanglement due to Ising interactions alongside reduced coherence from environmental redistribution. $��L�Q�F�I�$ proves more resilient than coherence in specific scenarios, emphasizing decoherence's varying impacts on quantum correlations. This research underscores the complexity of quantum coherence dynamics and the crucial role of environmental factors in shaping quantum correlations, providing insights into entanglement and coherence behavior under environmental influences and guiding future studies in quantum information processing and correlation dynamics.

A scheme is proposed for generating entanglement and achieving perfect one-way EPR (Einstein–Podolsky–Rosen) steering in a cross-shaped cavity magnonics system via the Kerr effect arising from magnetocrystalline anisotropy. The scheme involves two microwave cavities with distinct quality factors that simultaneously couple to a magnon mode of a macroscopic yttrium-iron-garnet sphere via the magnetic-dipole interaction. It is demonstrated that both the bipartite and tripartite entanglement among the three modes will be generated due to Kerr nonlinearity, and the perfect one-way EPR steering will also be achieved between the cavity with higher quality factor and the magnon mode. Notably, this scheme differs from conventional protocols that produce asymmetric EPR steering by introducing additional unbalanced losses or noises; instead, it can generate and manipulate one-way EPR steering solely by adjusting the detuning between the magnon mode and the microwave drive field. It is also analyzed that the robustness of the entanglement and EPR steering against the dissipation of magnon and environmental temperature. The present scheme may provide a promising platform and an efficient quantum resource for quantum information processing.