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首页> 外文会议>Conference on quantum and nonlinear optics >Towards coherent manipulation of ground states of single cesium atom confined in a microscopic far-off-resonance optical dipole trap
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Towards coherent manipulation of ground states of single cesium atom confined in a microscopic far-off-resonance optical dipole trap

机译：朝着相干操作限制在微观遥共振光学偶极阱中的单个铯原子的基态

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This work deals with the cooling and trapping of single cesium (Cs) atoms in a large-magnetic-gradient magneto-optical trap (MOT) and the confinement of single Cs atoms in a far-off-resonance optical dipole trap (FORT). The experiment setup is based on two large-numerical-aperture lens assemblies which allow us to strongly focus a 1064-nm TEMoo-mode Gaussian laser beam to a 1/e~2 radius of ～2.3 μm to form a microscopic FORT for isolating single atom with environment and to efficiently collect the laser-induced-fluorescence photons emitted by single atoms for detecting and recognizing single atom's internal state. We have tried both of "bottom-up" and "top-down" loading schemes to confine single atoms in the microscopic FORT. In the "bottom-up" scheme, we have successfully prepared single Cs atoms in the MOT and transferred it into FORT with a probability of almost 100%. In the "top-down" scheme, we have achieved ～74% of single atom loading probability in the FORT using light-assisted collisions induced by blue detuning laser and with prepared many Cs atoms in the MOT. The relaxation time in hyperfine level of ground state of trapped single Cs atom is measured to be ～5.4 s. To coherently manipulate atomic quantum bits (qubit) encoded in the clock states (m_F= 0 states in F_g = 3 and 4 hyperfine levels) of single Cs atom via the two-photon simulated Raman adiabatic passage (STIRAP), we have prepared two phase-locked laser beams with a frequency difference of ～9.192 GHz by optically injecting an 852-nm master laser to lock the +1-order sideband of a 9-GHz current-modulated slave diode laser. The two phase-locked laser beams are used to drive STIRAP process in the A-type three-level system consists of Cs |6S|_(1/2)F_g= 4, m_F = 0> and |6S_(1/2) F_g = 3, m_F = 0> long-lived clock states and Cs |6S_(1/2) F_e = 4, m_F = +1> excited state with the single-photon detuning of ～ -20 GHz. Rabi flopping experiments are in progress.
机译：这项工作涉及大磁梯度磁光阱（MOT）中单个铯（Cs）原子的冷却和俘获，以及远共振光学偶极阱（FORT）中单个Cs原子的约束。实验装置基于两个大孔径透镜组件，使我们能够将1064 nm nm TEMoo模式高斯激光束强烈聚焦到约2.3μm的1 / e〜2半径，以形成用于隔离单个透镜的微观FORT。原子与环境并有效收集单个原子发出的激光诱导的荧光光子，以检测和识别单个原子的内部状态。我们尝试了“自下而上”和“自上而下”的加载方案，以将单个原子限制在微观FORT中。在“自下而上”方案中，我们已经成功地在MOT中准备了单个Cs原子，并以几乎100％的概率将其转移到FORT中。在“自上而下”方案中，通过使用蓝色失谐激光诱导的光辅助碰撞并在MOT中准备了许多Cs原子，我们在FORT中获得了约74％的单原子加载概率。所捕获的单个Cs原子在基态的超精细能级中的弛豫时间经测量为〜5.4 s。为了通过双光子模拟拉曼绝热通道（STIRAP）相干地操纵以单个Cs原子的时钟状态（m_F = 0状态，F_g = 3和4个超精细能级）编码的原子量子位（qubit），我们准备了两相通过光学注入852 nm主激光器来锁定9 GHz电流调制从属二极管激光器的+1级边带，从而锁定频率差约为9.192 GHz的激光束。在Cs | 6S | _（1/2）F_g = 4，m_F = 0>和| 6S_（1/2）组成的A型三能级系统中，两个锁相激光束用于驱动STIRAP过程。 F_g = 3，m_F = 0>长寿时钟状态，Cs | 6S_（1/2）F_e = 4，m_F = +1>激发态，单光子失谐约为-20 GHz。 Rabi翻牌实验正在进行中。

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