

Dongjun Li, Pratik Wagle, Yanbei Chen, and Nicolás Yunes
Phys. Rev. X 13, 021029 (2023)
A mathematical formalism for studying quasinormal gravitational-wave modes from coalescing black holes provides a tool for testing modifications to general relativity.

Pei Liu et al.
Phys. Rev. X 13, 021028 (2023)
A multilevel qubit, or “qudit,” in a superconducting transmon shows high fidelity with several rudimentary algorithms, demonstrating the potential of a quantum computing architecture based on up to four levels rather than just two.

Jennifer A. Black et al.
Phys. Rev. X 13, 021027 (2023)
A demonstration of an optical synthesizer—a laser light source whose wavelength can be programmed—showcases a tool that can provide arbitrary wavelength access to applications such as signal processing and quantum sensing.

Samuel J. Garratt, Zack Weinstein, and Ehud Altman
Phys. Rev. X 13, 021026 (2023)
When quantum critical states are measured in many locations, new collective phenomena can emerge. There are transitions between two regimes: one where the effects of measurements on correlations are negligible, and one where they are dramatic.

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