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Chinese Physics Letters

Strings of Ion Crystals in a Linear Trap for Quantum Information Processing

周飞, 谢艺, 徐酉阳, 黄学人, 冯芒

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

一些激光使 40Ca+ 晶体凉下来成功地在我们的造家的线性离子陷井被限制了，并且为量信息处理准备好了。我们发现云水晶对使激光凉下来的 Doppler 的频率并且到套住的电压强烈敏感的套住的离子的阶段转变。量一个单个离子跳被与极端狭窄的带宽由弱激光控制离子的四极转变观察了。[从作者抽象]

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一些激光使 40Ca+ 晶体凉下来成功地在我们的造家的线性离子陷井被限制了，并且为量信息处理准备好了。我们发现云水晶对使激光凉下来的 Doppler 的频率并且到套住的电压强烈敏感的套住的离子的阶段转变。量一个单个离子跳被与极端狭窄的带宽由弱激光控制离子的四极转变观察了。[从作者抽象]
The use of cold trapped ions for quantum information processing requires the preparation of linear strings of ions at low temperatures and the coherent manipulation by laser light of the quantum state of individual ions in the string. In our experiment, 40Ca+ ions are trapped in a linear Paul trap, forming crystallized linear strings when laser cooled. These strings are observed by fluorescence detection on the S1/2-P1/2 dipole transition at 397 nm using a photomultiplier and a CCD camera. The narrow S1/2-D5/2 quadrupole transition at 729 nm is used to investigate and manipulate the vibrational motion of the ion in the trap. The spectral resolution obtained up to now on this transition is 2 · 10—12, proving long coherence time of the two-level system. Addressing of individual ions in the string is achieved, using a tightly focused laser beam at 729 nm, and detected by the observation of quantum jumps from the S1/2 to the D5/2 level. These experimental techniques make ions in a superposition of their S1/2 and D5/2 states suitable as qubits for quantum information processing. The realization of a two-ion quantum gate furthermore requires ground-state cooling of the string. The status of current experiments is reviewed and techniques to achieve ground-state cooling of ion strings are discussed.
We present studies of mixed Coulomb crystals of 40Ca+ and 40Ca2+ ions in a linear Paul trap. Doubly charged ions are produced by photoionisation of trapped 40Ca+ with a vacuum ultraviolet laser source and sympathet-ically cooled via Doppler cooled 40Ca+ ions. We in-vestigate experimentally and theoretically the struc-tural configurations and the vibrational modes of these mixed crystals. Our results with 40Ca2+ are an impor-tant step towards experimental realization of the pro-posals for mode shaping in a linear crystal and spin-dependent configuration changes from zigzag to linear as proposed by Li et al., Phys. Rev. A 87, (2013) 052304 and Phys. Rev. Lett 108, (2012) 023003 using ions excited to Rydberg states. 1