Mechanism and Lineshapes of Sub-Fourier Resonances

不均衡超冷气体中Efimov共振的非对称线形

Asymmetric lineshapes of Efimov resonances in mass-imbalanced ultracold gases

研究不均衡超冷气体中Efimov共振的非对称线形，结合绝热超球面表示法和半经典方法，推导出描述共振宽度和Fano参数的闭合表达式，并揭示q-反转效应。

From membrane-in-the-middle to mirror-in-the-middle with a high-reflectivity sub-wavelength grating

We demonstrate a "membrane in the middle" optomechanical system using a silicon nitride membrane patterned as a subwavelength grating. The grating has a reflectivity of over 99.8%, effectively creating two sub-cavities, with free spectral ranges of 6 GHz, optically coupled via photon tunneling. Measurements of the transmission and reflection spectra show an avoided crossing where the two sub-cavities simultaneously come into resonance, with a frequency splitting of 54 MHz. We derive expressions for the lineshapes of the symmetric and antisymmetric modes at the avoided crossing, and infer the g…

Observation of sub-Fourier resonances in a quantum-chaotic system

We experimentally show that the response of a quantum-chaotic system can display resonance lines sharper than the inverse of the excitation duration. This allows us to discriminate two neighboring frequencies with a resolution nearly 40 times better than the limit set by the Fourier inequality. Furthermore, numerical studies indicate that there is no limit, but the loss of signal, to this resolution, opening ways for the development of sub-Fourier quantum-chaotic signal processing.

通过傅里叶磁成像实现氮空位中心的亚纳米级分辨率

Sub-nanometer resolution of the nitrogen-vacancy center by Fourier magnetic imaging

该研究通过傅里叶磁成像技术实现了氮空位中心的亚纳米级定位，展示了高精度的磁感应测量能力，为蛋白质和细胞内自旋定位提供了新方法。