| Volume 95, Issue 1 (partial) January - March 2023 | | Advertisement | Attending the APS March Meeting 2023 in Las Vegas? Join several editors from the Physical Review Journals Wednesday 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. | | | | |
Advertisement | Registration is open for April Meeting 2023: Quarks to Cosmos! Discover cutting-edge research in astrophysics, particle physics, nuclear physics, and gravitation, network with other physicists to advance your career, and learn about current issues relevant to the physics community. Register today » | | | | | | Not an APS member? Join today to start connecting with a community of more than 50,000 physicists. | | | | Matteo Baggioli and Blaise Goutéraux Rev. Mod. Phys. 95, 011001 (2023) – Published 4 January 2023  | Hydrodynamics is an old example of an effective description of complex matter, which describes the system's behavior at large length and timescales and lumps microscopic details into transport coefficients. A combination of hydrodynamics and the gauge-gravity duality, which was first explored in the context of string theory, has proven promising for a description of strongly correlated electron fluids. This Colloquium explains how to apply these techniques to strongly correlated materials where the electron fluid crystallizes, and in particular to the strange metal phase of high-temperature superconductors. | | | | | | Cui-Zu Chang, Chao-Xing Liu, and Allan H. MacDonald Rev. Mod. Phys. 95, 011002 (2023) – Published 23 January 2023  | The quantum Hall effect, discovered by von Klitzing more than 40 years ago, requires strong magnetic fields for its realization. More recently it was found that the effect can also be realized in zero magnetic field as a result of spontaneous time-reversal symmetry breaking. This Colloquium discusses the physics underlying this quantum anomalous Hall effect, the materials it is observed in, and potential applications. | | | | | | Otfried Gühne, Erkka Haapasalo, Tristan Kraft, Juha-Pekka Pellonpää, and Roope Uola Rev. Mod. Phys. 95, 011003 (2023) – Published 6 February 2023  | It is common to say that a quantum measurement is described by a Hermitian operator; e.g., we do a "position" measurement or a "momentum" measurement. The modern perspective is that this is too narrow a view of what a measurement can be, with more concepts needed, like partial measurement, weak measurement, and a quantum instrument. This Colloquium provides a larger perspective, and shows how measurement incompatibility and related uncertainty relations are extended to more general settings. One such insight is that measurements that disturb each other are in fact a valuable resource in a variety of quantum information protocols. | | | | | | Justyna P. Zwolak and Jacob M. Taylor Rev. Mod. Phys. 95, 011006 (2023) – Published 17 February 2023  | A promising platform for quantum computing consists of arrays of quantum dots. However, operating these devices presents a challenging control problem, since the location of the dots and the charges they contain must be reliably and reproducibly matched with the gate voltages. This Colloquium explains how automated control protocols that make use of machine learning techniques can succeed in systems where heuristic control is not feasible. | | | | | | | |
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