| Volume 107, Issue 2 February 2023 | | Advertisement | Attending the APS March Meeting 2023 in Las Vegas? Join several editors from the Physical Review Journals Tuesday, March 7 at 4:30 p.m. PT for complimentary cocktails and hor d'oeuvres. Discuss your submission, get tips on refereeing, and learn more about editing the Physical Review Journals. All registrants are welcome! Learn more. | | | | |
| Not an APS member? Join today to start connecting with a community of more than 50,000 physicists. | | | | Editors' Suggestion Saronath Halder and Ujjwal Sen Phys. Rev. A 107, 022413 (2023) – Published 10 February 2023  | In bipartite quantum systems, mixtures of entangled and product states are always entangled, but superpositions of the same states may not be. Here, the authors detail the conditions for separability of such superpositions and outline applications in local quantum state discrimination. | | | | | | Editors' Suggestion Frédéric Bouchard, Kent Bonsma-Fisher, Khabat Heshami, Philip J. Bustard, Duncan England, and Benjamin Sussman Phys. Rev. A 107, 022618 (2023) – Published 22 February 2023  | Time-bin qudits, which are valued in quantum communication protocols for their efficiency and robustness, are made by encoding information into the relative arrival times of photons. However, their practicality has been limited due to the difficulty of the measurements needed to extract this information. Here, the authors demonstrate an effective experimental technique that uses active and passive optical elements to conduct single-shot measurements of ultrafast four-time-bin qudits. | | | | | | Editors' Suggestion Henrik H. Kristensen, Lorenz Kranabetter, Constant A. Schouder, Jacqueline Arlt, Frank Jensen, and Henrik Stapelfeldt Phys. Rev. A 107, 023104 (2023) – Published 6 February 2023  | The authors use velocity-map imaging following Coulomb explosion of doubly ionized alkali homodimers on the surface of a helium nanodroplet to map out the distribution of internuclear distances in both the ground and lowest triplet state. They find that the distributions are generally broader than the internuclear wave function, which they attribute to resonance effects in the initial multiphoton ionization of the dimer and interaction of the ions with the He droplet. | | | | | | Featured in Physics Editors' Suggestion Jakob Hüpfl, Nicolas Bachelard, Markus Kaczvinszki, Michael Horodynski, Matthias Kühmayer, and Stefan Rotter Phys. Rev. A 107, 023112 (2023) – Published 22 February 2023  | The authors introduce a method to cool down a set of levitated particles based on the spatial modulation of light in the far field, which applies to freely moving and trapped nano-objects, regardless of their geometries. This article provides a theoretical and numerical study of the expected cooling performance as well as the robustness of the method against environmental parameters. | | | | | | Editors' Suggestion Erika Cortese, David B. Cassidy, and Simone De Liberato Phys. Rev. A 107, 023306 (2023) – Published 10 February 2023  | The authors develop a theoretical proposal for the formation of polaritons in a gas of positronium atoms and the real-time measurement of positronium densities in present-day experimental setups. The results could be an important step towards the achievement of positronium BEC. | | | | | | Editors' Suggestion Saumya Choudhary, Robert W. Boyd, and J. E. Sipe Phys. Rev. A 107, 023521 (2023) – Published 27 February 2023  | The authors derive a semianalytical model describing the reflection and absorption spectra of dipolar bilayer metasurfaces, showing how radiative coupling between the layers can result in the formation of nonradiative dark modes which can contribute significantly to the optical response of the system. The ability to vary the reflection and absorption spectra of such bilayers by changing the material and geometrical parameters, and to selectively excite the modes by adjusting the phase between two counter-propagating normally incident fields, promises numerous applications. | | | | | | Editors' Suggestion James D. Gaynor, Ashley P. Fidler, Yuki Kobayashi, Yen-Cheng Lin, Clare L. Keenan, Daniel M. Neumark, and Stephen R. Leone Phys. Rev. A 107, 023526 (2023) – Published 28 February 2023  | The authors use attosecond four-wave-mixing spectroscopy to measure coherent superpositions of Rydberg states resulting from extreme ultraviolet excitation of a 3s electron in gas phase atomic argon to a series of autoionizing 3s-1np Rydberg states. The experimental observations are reproduced by electronic-structure and transition-moment calculations. | | | | | | Editors' Suggestion Elmer Suarez, Federico Carollo, Igor Lesanovsky, Beatriz Olmos, Philippe W. Courteille, and Sebastian Slama Phys. Rev. A 107, 023714 (2023) – Published 15 February 2023  | Typically, physicists treat cold atoms in a cavity as simple two-level atoms. Here, the authors go beyond this approximation to show that adding more levels causes light-matter coupling to be time dependent and results in nonlinear behavior. They experimentally confirm these effects using laser-cooled rubidium. | | | | | | | |
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