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物理学前沿：英文版

Quantum state manipulation of single-Cesium-atom qubit in a micro-optical trap

Zhi-Hui, Wang, Gäng, Li, Yali, Tian, Tian-cai, Zhang

Published Jan 1, 2014• 0 citations
OpenAlex

Abstract

把我们展出了的显微镜的光陷井基于在 1064 nm 套住的单个铯原子编码为铯钟的单个 qubit 说。有高效率的单个 qubit 初始化，察觉和快州的旋转被表明，这州的操作为量信息处理是关键的。扎根的状态 Rabi 229.0 的跳动的率

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Based on single Cesium atoms trapped in a 1064 nm microscopic optical trap we have exhibited a single qubit encoded in the Cesium “clock states”. The single qubit initialization, detection and the fast state rotation with high efficiencies are demonstrated and this state manipulation is crucial for quantum information processing. The ground states Rabi flopping rate of 229.0 ± 0.6 kHz is realized by a two-photon Raman process. A clock states dephasing time of 3.0±0.7 ms is measured, while an irreversible homogeneous dephasing time of 124±17 ms is achieved by using the spin-echo technique. This well-controlled single atom provides an idea quantum qubit and quantum node for quantum information processing.
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.