Population inversion in hyperfine states of Rb with a single nanosecond chirped pulse in the framework of a 4-level system

Two-photon adiabatic passage in ultracold Rb interacting with a single nanosecond, chirped pulse

A semiclassical, four-level model of a nanosecond, chirped pulse interacting with all optically accessible hyperfine states in the ultracold Rb atom is analyzed aiming at population inversion within $5S_{1/2}$ electronic state. The nature of two-photon adiabatic passage performed by such a single pulse having a bandwidth smaller than the hyperfine splitting of $5S_{1/2}$ state is investigated in the framework of the dressed state picture. It is shown that two dressed states are involved in the adiabatic dynamics of population inversion. The excited state manifold appeared to play an important …

利用纳秒自旋相关踢动的旋量物质波操控

Spinor matterwave control with nanosecond spin-dependent kicks

本文针对高效拉曼激发中动力学相位和自旋泄漏问题，提出动态编程绝热脉冲序列方法，在40纳秒内实现约97.6%保真度的自旋相关踢动，并证明平衡交替啁啾可抵消相位误差、抑制非绝热误差，实现旋量物质波的精确快速操控。

Dispersive optical systems for scalable Raman driving of hyperfine qubits

Hyperfine atomic states are among the most promising candidates for qubit encoding in quantum information processing. In atomic systems, hyperfine transitions are typically driven through a two-photon Raman process by a laser field which is amplitude modulated at the hyperfine qubit frequency. Here, we introduce a new method for generating amplitude modulation by phase modulating a laser and reflecting it from a highly dispersive optical element known as a chirped Bragg grating (CBG). This approach is passively stable, offers high efficiency, and is compatible with high-power laser sources, en…

用于自旋缺陷量子记忆的亚纳秒级控制：一种低成本、紧凑型FPGA平台

Sub-nanosecond control for spin-defect quantum memories with a low-cost, compact FPGA platform

本文通过扩展开源QICK框架，利用波形偏移方法实现低成本FPGA平台的亚纳秒级控制，用于钻石中氮-空位中心的动力学去耦光谱学，实现了对单个^13C核自旋的超精细耦合精确提取。