Frequency filtered storage of parametric fluorescence with electromagnetically induced transparency

Electromagnetically induced transparency and dark fluorescence in a cascade three-level Lithium molecule

We observed electromagnetically induced transparency (EIT) and dark fluorescence in a cascade three-level diatomic Lithium system using Optical-Optical Double Resonance (OODR) spectroscopy. When a strong coupling laser couples the intermediate state $A^{1}Σ^{+}_{u}(v=13, J=14)$ to the upper state $G^{1}Π_{g}(v=11, J=14)$ of $^7Li_2$, the fluorescence from both $A^{1}Σ^{+}_{u}$ and $G^{1}Π_{g}$ states was drastically reduced as the weak probe laser was tuned through the resonance transition between the ground state $X^{1}Σ^{+}_{g}(v=4, J=15)$ and the excited state $A^{1}Σ^{+}_{u}(v=13, J=14)$. …

The Role of Doppler Broadening in Electromagnetically Induced Transparency and Autler-Townes Splitting in Open Molecular Systems

We describe in this Letter how inhomogeneous line broadening affects the Autler-Townes (AT) splitting in a three level open molecular cascade system. For moderate Rabi frequencies in the range of 300 to 500 MHz the fluorescence line shape from the uppermost level |3> in this system depends strongly on the frequency ratio of the two laser fields. However, the fluorescence spectrum of the intermediate level |2> appears as expected. We provide a description of the conditions for optimally resolved AT splitting in terms of the probe laser/coupling field frequency ratio and laser propagation geomet…

Rydberg electromagnetically induced transparency and absorption of strontium triplet states in a weak microwave field

We study theoretically laser excitation of Rydberg triplet states of strontium atoms in the presence of weak microwave (MW) fields. Starting from the ground state $5s^2\,^1S_0$, the Rydberg excitation is realized through the metastable, triplet $5s5p\,^3P_1$ state, whose decay rate $γ_2$ is $2π\times 7.5$ kHz, much smaller than the one in the singlet state or alkali atoms. The influences of $γ_2$ on the transparency and absorption spectrum in the electromagnetically induced transparency (EIT), and electromagnetically induced absorption (EIA) regime are examined. Narrow transparent windows (EIT…

Photon Statistics of Filtered Resonance Fluorescence

Spectral filtering of resonance fluorescence is widely employed to improve single photon purity and indistinguishability by removing unwanted backgrounds. For filter bandwidths approaching the emitter linewidth, complex behaviour is predicted due to preferential transmission of components with differing photon statistics. We probe this regime using a Purcell-enhanced quantum dot in both weak and strong excitation limits, finding excellent agreement with an extended sensor theory model. By changing only the filter width, the photon statistics can be transformed between antibunched, bunched, or …

共振荧光的多模阵列滤波

Multi-Mode Array Filtering of Resonance Fluorescence

本研究提出基于可调谐单模腔阵列的多模阵列滤波器，结合相位调制实现高隔离度宽带频率滤波，用量子开放系统方法高效计算光子关联，在二能级原子系统中验证了其性能并可探索新的光子关联机制。

用于电场测量的三光子里德堡激发的荧光与透射读出研究

Investigation of fluorescence versus transmission readout for three-photon Rydberg excitation used in electrometry

提出一种基于三光子的荧光读出方法用于电场测量，相比传统EIT/EIA透射读出，在铯系统中实现了更高灵敏度，较目前最佳报道提升近4倍。