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Author(s): Cosimo C. Rusconi, Eric Sierra, Wai-Keong Mok, Avishi Poddar, Simon B. Jäger, and Ana Asenjo-Garcia Cooperative emission is well understood for idealized symmetric systems, but its fundamental limits in spatially extended, free-space ensembles remain an open question. Here, we derive a universal law for the scaling of the maximum photon emission rate with system size that unifies both ordered arra… [Phys. Rev. Lett. 137, 143603]...

Author(s): Songyu Zhu, Yushan Zeng, Chenhao Pan, Yiming Pan, Ye Tian, and Ruxin Li The pursuit of programmable light sources with high coherence and spectral purity hinges on establishing a precise set of phase relationships in light-matter interactions. Here, we demonstrate that the quadratic dispersion of a freely propagating electron wave packet serves as a programmable quantum… [Phys. Rev. Lett. 137, 143601] Published Tue Sep 29, 2026

Author(s): Xin Liu, Qing-Hong Liao, Qing-Yue Zhang, and Yong-Chun Liu Nonlinearity at the single-photon level is important in both fundamental research and applications of quantum optics. Strong single-photon nonlinearity is usually hard to achieve with a single atom coupled to a cavity mode. Unfortunately, stronger nonlinearity cannot be achieved by coupling more ato… [Phys. Rev. Lett. 137, 143602] Published Tue Sep 29, 2026

Author(s): Yajing Yang, Biao Shan, Yuhang Zhao, Jiahui Shen, Zhuxiong Ye, Liangchao Chen, Zengming Meng, Pengjun Wang, Wei Han, Jing Zhang, and Lianghui Huang Hyperfine constant $A$ is a key parameter of the hyperfine structure and underpins precision spectroscopy and metrology. In this Letter, we develop a magnetic-field-calibration-free method for determining the ground-state hyperfine constant $A$ in an ultracold $^{40}\mathrm{K}$ Fermi gas...

Author(s): Soheil Farazi and Srinivas Tadigadapa Thermal radiation is inherently broadband and incoherent, limiting its utility in applications requiring spectral selectivity such as molecular spectroscopy and free-space optical communications. Bound states in the continuum (BICs) provide a powerful route to confine light in open photonic systems … [Phys. Rev. Lett. 137, 133802] Published Fri Sep 25, 2026

Author(s): Artuur Stevens and Christophe Caloz We introduce the instantaneous eigenstate method to study the evolution of quantum states in nondispersive, homogeneous media with arbitrary time-varying permittivity and permeability. This method leverages the Heisenberg equation to bypass the Schrödinger equation, which leads to a complicated infi… [Phys. Rev. Lett. 137, 133601] Published Tue Sep 22, 2026

Author(s): Yue Chang Bound states in the continuum (BICs) can confine photonic excitations in open systems without conventional cavities or band gaps, making them promising candidates for long-lived quantum storage and single-photon control. Their use as quantum resources is limited, however, by two basic difficulties: … [Phys. Rev. Lett. 137, 133602] Published Tue Sep 22, 2026