We propose a simple scheme for highly efficient nonlinear interaction between two weak optical fields. The scheme is based on the attainment of electromagnetically induced transparency simultaneously for both fields via transitions between magnetically split F=1 atomic sublevels, in the presence of two driving fields. Thereby, equal slow group velocities and symmetric cross-coupling of the weak fields over long distances are achieved. By simply tuning the fields, this scheme can either yield giant cross-phase modulation or ultrasensitive two-photon switching.
Spin squeezing inequalities (SSI) represent a major tool to probe quantum entanglement among a collection of few-level atoms, and are based on collective spin measurements and their fluctuations. Yet, for atomic ensembles of spin-$j$ atoms and ultracold spinor gases, many experiments can image the populations in all Zeeman sublevels $s=-j, -j+1, \dots, j$, potentially revealing finer features of quantum entanglement not captured by SSI. Here we present a systematic approach which exploits Zeeman-sublevel population measurements in order to construct novel entanglement criteria, and illustrate …
Raman sideband cooling of a 138Ba+ ion using a Zeeman interval
运动基态冷却和内态制备是量子信息处理中量子逻辑谱的重要组成部分。由于QLS不需要通常与量子计算和量子模拟相关联的高门级性能，因此可以以一定保真度为代价来简化离子种类和量子协议的选择。在这里，我们报告边带冷却和运动状态检测协议$^{138}$钡$^+$的QLS没有一个非常窄带的激光或使用的物种与超精细结构的足够的保真度。我们利用$^{138}$ Ba $^+$的两个S $_{1/2}$塞曼子能级，通过拉曼边带将单个离子冷却到运动基态.由于小的塞曼分裂，$^{138}$ Ba $^+$的近共振拉曼边带冷却仅需要多普勒冷却激光器和两个附加的AOM。通过观察近共振拉曼光抽运荧光，我们估算了最终的平均运动量子数$\bar{n}\approx0.17$。我们还采用了第二个，远离共振激光驱动拉曼$π$ -脉冲之间的两个塞曼子级，以提供运动状态检测QLS和确认边带冷却效率，测量最终的$\bar{n} = 0.15(6)$。
We demonstrate a novel method based on the Zeeman splitting of electronic spins to improve the performance for temperature sensing of negatively-charged nitrogen-vacancy (NV) centers in multiple-poly diamond. The theoretical model for selection principle of resonance peaks corresponding to a single NV axis for determining the temperature dependence is clarified. The spectral linewidth is effectively narrowed and the thermometer is insensitive to magnetic field fluctuations. Repeatability and accuracy of the relationship calibration between the zero-field splitting (ZFS) parameter D and tempera…
We predict a dynamical resonant effect, which is driven by externally applied linear and quadratic Zeeman fields, in a spin-orbit-coupled spin-1 Bose-Einstein condensate. The Bose-Einstein condensate is assumed to be initialized in some superposed state of Zeeman sublevels and subject to a sudden shift of the trapping potential. It is shown that the time-averaged center-of-mass oscillation and the spin polarizations of the Bose-Einstein condensate exhibit remarkable resonant peaks when the Zeeman fields are tuned to certain strengths. The underlying physics behind this resonance can be traced …
Hyperfine and Zeeman Optical Pumping and Transverse Laser Cooling of a Thermal Atomic Beam of Dysprosium Using a Single 421 nm Laser
Johannes Gutenberg-Universität Mainz（约翰内斯·古腾堡美因茨大学）；Helmholtz-Institut Mainz, GSI Helmholtzzentrum für Schwerionenforschung（亥姆霍兹美因茨研究所，GSI重离子研究中心）；Department of Physics, Indian Institute of Technology Tirupati（蒂鲁帕蒂印度理工学院物理系）；Korea National University of Education（韩国国立教育大学）；Department of Physics, University of California, Berkeley（加州大学伯克利分校物理系）
Computational crystal-field models have provided consistent models of both electronic and Zeeman-hyperfine structure for several rare earth ions. These techniques have not yet been applied to the Zeeman-hyperfine structure of Eu$^{3+}$ because modeling the structure of the $J=0$ singlet levels in Eu$^{3+}$ requires inclusion of the commonly omitted lattice electric quadrupole and nuclear Zeeman interactions. Here, we include these terms in a computational model to fit the crystal field levels and the Zeeman-hyperfine structure of the $^7F_0$ and $^5D_0$ states in three Eu$^{3+}$ sites: the C$_…
