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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.

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The author theoretically studies the structure of self-bound one-dimensional droplets containing a mixture of ytterbium fermionic isotopes. The results indicate that these droplets consist of consecutive molecules made up of two different isotopes of ytterbium.

The authors present experimental data for annihilation spectra and binding energies for positron interactions with several aromatic and heterocyclic ring molecules. The results are compared with the predictions of an $ab$ $initio$ theory of positron binding with excellent agreement.

The authors derive the topological origin for the skin effect in a chiral waveguide quantum electrodynamics system which is lossless in the bulk. Unlike the conventional skin effect, this skin effect depends on the finite size of the lattice and is termed the “mesoscopic non-Hermitian skin effect.”

The authors investigate spontaneous polarization and bistability in a room-temperature coated Cs cell with remarkably long spin coherence times of 17 seconds. Their results shed new light onto the phenomenon of spin bistability and spin-exchange collisions, and may find applications in optical switches utilizing spin-bistability-relevant devices in integrated optics and potentially in quantum interfaces.

The authors report the experimental realization of an effective Hamiltonian with a continuously adjustable staggered gauge field for weakly interacting bosons in an optical lattice using Floquet engineering. They observe recondensation of quench-excited atoms on time scales faster than global heating due to the drive.

The authors introduce a model of C${}_{60}$ resonant charge transfer which accounts for the formation of temporary bonds between the two colliding fullerenes. These bonds extend the interaction time between the two molecules, increasing the charge-transfer cross section.

The authors report the experimental observation of the spontaneous appearance of currents in a ring of ultracold fermionic ${}^6$Li atoms with attractive interactions, following a quench to a BCS-like pair superfluid. The results are compared with the predictions from the Kibble-Zurek mechanism.

The authors investigate the use of time-crystal phases for metrology, providing a concrete proposal as quantum sensors of AC fields. Their performance shows several useful advantages due to their long-range spatiotemporal ordering, overcoming the shot noise limit along with long interrogation times and robustness.

Counterintuitively, the authors show that critical metrology not only remains robust in the presence of finite temperature but can also benefit from it. Moreover, in certain cases, excited states exhibit significantly more non-classical behavior than ground states, further contributing to quantum-enhanced metrology.

The authors study First-Passage-Time distributions, and how they can be computed for stochastic measurement currents. They gain insights into signal-to-noise-ratio bounds and false positive reduction strategies, and charge-resolved master equations.

The authors exploit a connection between the theoretical renormalization group equation flow and the expansion dynamics of strongly interacting quantum gases. This analysis shows that there shall be an emergent conformal symmetry that restricts the dynamics and limits entropy production in one dimension, while it is absent in three-dimensions.

A method for analyzing uncertainties in so-called analog quantum simulations could help scientists make precise predictions using these models.

Synopsis on:
Nikita A. Zemlevskiy, Henry F. Froland, and Stephan Caspar
Phys. Rev. A 109, 052425 (2024)

Strongly correlated quantum many-body systems from condensed matter and particle physics are very hard to study classically and variational quantum algorithms (VQAs) may be hampered by barren plateaus, where energy gradients decay exponentially in the system size. The authors prove that this critical problem can be resolved by employing VQAs based on suitable isometric tensor network states, establishing a new route for the investigation of strongly correlated quantum matter on NISQ devices.

APS has selected 156 Outstanding Referees for 2024 who have demonstrated exceptional work in the assessment of manuscripts published in the Physical Review journals. A full list of the Outstanding Referees is available online.

Three journals are excited to announce a new article type, “Perspectives,” to provide forward-looking views of cutting-edge science that has recently emerged or is enjoying renewed activity.

We are very pleased to offer the readers of Physical Review a new, carefully curated collection of articles from the vibrant field of laser-plasma particle acceleration. Some of the articles have already been published, and others will be forthcoming. This Collection is the latest in the journal’s series of Special Collections on current or emerging fields and topics.

Physicists working in optics, atomic and molecular physics, and quantum information reflect on landmark papers and how they influence research today.

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