Interaction of a laser with a qubit in thermal motion and its application to robust and efficient readout
Interaction of a laser with a qubit in thermal motion and its application to robust and efficient readout
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DOI：
10.1007/s00340-012-4882-3
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发表时间：
2011-09
期刊：
影响因子：
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通讯作者：
U. Poschinger;A. Walther;M. Hettrich;F. Ziesel;F. Schmidt-Kaler
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文献类型：
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作者：
U. Poschinger;A. Walther;M. Hettrich;F. Ziesel;F. Schmidt-Kaler
对受热致Rabi频率起伏的囚禁离子量子比特的光学控制进行了详细的理论和实验研究。耦合涨落是由三个谐振子模上的热激发引起的。我们发展了一个有效的麦克斯韦-玻尔兹曼理论，它导致用一个有效的拉比频率的连续概率分布函数来代替几个量子化振子模。实验验证了该模型用于驱动四极跃迁的共振方脉冲。这样可以在0.5Td到5Td的范围内测定离子温度，其准确度优于与多普勒冷却极限Td有关的温度的2%。然后，该理论被成功地应用于快速绝热通过(RAP)脉冲的实验数据建模。我们应用该模型和所获得的实验参数，通过数值模拟来说明RAP过程的稳健性和有效性。
We present a detailed theoretical and experimental study on the optical control of a trapped-ion qubit subject to thermally induced fluctuations of the Rabi frequency. The coupling fluctuations are caused by thermal excitation on three harmonic oscillator modes. We develop an effective Maxwell–Boltzmann theory which leads to a replacement of several quantized oscillator modes by an effective continuous probability distribution function for the Rabi frequency. The model is experimentally verified for driving the quadrupole transition with resonant square pulses. This allows for the determination of the ion temperature with an accuracy of better than 2% of the temperature pertaining to the Doppler cooling limitTDover a range from 0.5TDto 5TD. The theory is then applied successfully to model experimental data for rapid adiabatic passage (RAP) pulses. We apply the model and the obtained experimental parameters to elucidate the robustness and efficiency of the RAP process by means of numerical simulations.