Comparison of single-neutral-atom qubit between in bright trap and in dark trap

作     者：Ya-Li Tian Zhi-Hui Wang Peng-Fei Yang Peng-Fei Zhang Gang Li Tian-Cai Zhang 田亚莉;王志辉;杨鹏飞;张鹏飞;李刚;张天才

作者机构：State Key Laboratory of Quantum Optics and Quantum Optics Devicesand Institute of Opto-ElectronicsShanxi University Collaborative Innovation Center of Extreme OpticsShanxi University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2019年第28卷第2期

页      面：192-196页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2017YFA0304502) the National Natural Science Foundation of China(Grant Nos.11634008,11674203,11574187,and 61227902) the Fund for Shanxi "1331 Project" Key Subjects Construction,Shanxi Province,China 

主　　题：single qubit laser trapping coherence time 

摘      要：A single neutral atom is one of the most promising candidates to encode a quantum bit(qubit). In a real experiment, a single neutral atom is always confined in a micro-sized far off-resonant optical trap(FORT). There are generally two types of traps: red-detuned trap and blue-detuned trap. We experimentally compare the qubits encoded in clock states of single cesium atoms confined separately in either 1064-nm red-detuned(bright) trap or 780-nm blue-detuned(dark) trap: both traps have almost the same trap depth. A longer lifetime of 117 s and a longer coherence time of about 10 ms are achieved in the dark trap. This provides a direct proof of the superiority of the dark trap over the bright trap. The measures to further improve the coherence are discussed.