PERSPECTIVE
The authors offer an overview of progress and a future perspective of large-scale optical quantum entanglement. They cover a broad range of topics from the basics of continuous-variable optical quantum entanglement and a multiplexing methodology for the generation of large-scale quantum entanglement to future approaches toward practical usages of large-scale optical quantum entanglement. The content includes both pedagogical content and the search for future directions beyond the current frontier.
Warit Asavanant and Akira Furusawa
Phys. Rev. A 109, 040101 (2024)
EDITORS' SUGGESTION
In this work, the author develops an alternative to the Langevin noise formalism of macroscopic quantum electrodynamics in such a way that the bare photon fluctuations are separated from those of the medium polaritons.
A. Ciattoni
Phys. Rev. A 110, 013707 (2024)
LETTER
The authors develop a non-equilibrium quantum theory for atoms with time-periodic cavity-mediated interactions and dissipation by eliminating the photonic modes. Their theory describes accurately the relaxation into stable time-crystalline steady states and is used to predict the phase transition lines.
Simon B. Jäger, Jan Mathis Giesen, Imke Schneider, and Sebastian Eggert
Phys. Rev. A 110, L010202 (2024)
EDITORS' SUGGESTION
The authors show how to use optimal control theory to maximize squeezing in an optomechanical setup with two external drives and determine how fast the mechanical mode can be squeezed. The results provide a clear recipe for experimentalists to achieve optimized quantum control in such optomechanical systems.
Anton Halaski, Matthias G. Krauss, Daniel Basilewitsch, and Christiane P. Koch
Phys. Rev. A 110, 013512 (2024)
EDITORS' SUGGESTION
The authors propose a method to study charged Bose polarons that emerge from the interaction between an ion and a Bose-Einstein condensate based on a mean-field approach in a co-moving frame. The method allows obtaining the ground state and induced interactions between ions mediated by the bath and can be applied to dynamical scenarios, which may otherwise be challenging with other numerical techniques.
Ubaldo Cavazos Olivas, Luis A. Peña Ardila, and Krzysztof Jachymski
Phys. Rev. A 110, L011301 (2024)
EDITORS' SUGGESTION
Multistability is experimentally observed in a variety of quantum systems but cannot be derived from any theoretical model that is based on a monostable master equation. The author investigates the relation between disentanglement and multistability in the few-spin transverse Ising model and finds that multistability can be obtained in the presence of spontaneous disentanglement.
Eyal Buks
Phys. Rev. A 110, 012439 (2024)
LETTER
There is a theoretical possibility of beyond-quantum nonlocality in the framework of general probabilistic theories. The authors give a protocol to detect beyond-quantum nonlocality with standard quantum devices.
Hayato Arai, Baichu Yu, and Masahito Hayashi
Phys. Rev. A 110, L010201 (2024)
LETTER
The authors suggest a method to enhance the lifetime of double excitations in quantum emitter ensembles by suppressing radiative emission. They employ the Friedrich-Wintgen mechanism of external coupling, akin to the formation of bound states in the continuum. Consequently, the generation of entangled photon pairs with nonzero angular momentum from quantum rings was predicted.
N. Ustimenko et al.
Phys. Rev. A 110, L011501 (2024)
LETTER
Quantum states possess an intrinsic form of randomness, inaccessible even to an all-powerful eavesdropper. The authors find concise mathematical expressions for the maximal intrinsic randomness that can be extracted from any quantum state, as quantified by the conditional min-, von Neumann and max-entropies. They also characterize the optimal (and inequivalent) measurements in each case.
Shuyang Meng et al.
Phys. Rev. A 110, L010403 (2024)
LETTER
The authors demonstrate a method for robust electronically driven quantum logic gates for trapped-ion qubits. Using “atomic clock” qubits stored in hyperfine states of calcium-43 ions, they have achieved the fastest such gates with greater than 99% fidelity.
M. A. Weber et al.
Phys. Rev. A 110, L010601 (2024)
LETTER
Particles with exotic statistics serve as an important testbed for quantum information protocols and help us better understand the properties of the more naturally occurring bosons and fermions. The authors investigate the separability of a class of exotic particles known as fermionic anyons, establishing a connection between their capabilities as an architecture for quantum computation and their link with bosonic and fermionic quantum computer setups.
Allan Tosta et al.
Phys. Rev. A 110, L010404 (2024)
NEW ARTICLE
The authors present a geometric picture for tripartite entanglement that is valid for discrete, continuous, and even hybrid quantum systems. They further show that the triangle area, enclosed by any tripartite state, is a faithful measure for genuine tripartite entanglement.
Xiaozhen Ge et al.
Phys. Rev. A 110, L010402 (2024)
LETTER
In the context of searches for a nonzero permanent electric dipole moment (EDM), a spin-precession method is demonstrated which provides a high sensitivity to experimental parameters such as electric-field strength and employed laser intensity while maintaining sensitivity to an EDM. This approach allows for constraining systematic biases as a necessary step towards an increased sensitivity in probing physics beyond the Standard Model through stringent EDM limits.
A. Boeschoten et al.
Phys. Rev. A 110, L010801 (2024)
LETTER
Increasing the high-order harmonic-generation brightness is a key route to advance attosecond XUV light sources, which can be done by exploiting a resonance with a ground-to-autoionizing-state transition of the atom. In this Letter, it is shown that narrower resonances not only boost the high-order harmonic microscopic response but also improve phase matching, while for wider resonances the phase matching can be achieved in high-order frequency mixing.
V. V. Strelkov and M. A. Khokhlova
Phys. Rev. A 110, L011101 (2024)
LETTER
Self-testing of quantum correlations is an important problem in quantum information theory, and the task becomes more challenging in multipartite scenarios. In this context, the authors provide a network-assistance-free self-testing scheme for genuine multipartite entangled states by employing a generalized Hardy-type nonlocality argument and exploring its device-independent bound of the maximum probability of success.
Ranendu Adhikary, Abhishek Mishra, and Ramij Rahaman
Phys. Rev. A 110, L010401 (2024)