Detection of motional ground state population of a trapped ion using delayed pulses
Detection of motional ground state population of a trapped ion using delayed pulses
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DOI：
10.1088/1367-2630/18/1/013037
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发表时间：
2015-09
影响因子：
3.3
通讯作者：
Florian Gebert;Yong Wan;F. Wolf;J. C. Heip;P. Schmidt
中科院分区：
文献类型：
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作者：
Florian Gebert;Yong Wan;F. Wolf;J. C. Heip;P. Schmidt
有效制备和检测捕获离子的运动状态在从量子计算到精密光谱学的许多实验中都很重要。我们研究了受激拉曼绝热通道（STIRAP）技术对捕获离子系统中运动态的操纵。该技术在25Mg+中使用两个超精细基态之间的拉曼耦合，通过延迟脉冲实现，从而去除与初始运动状态无关的单个声子。我们表明，对于运动状态的热概率分布，STIRAP人口转移比运动边带上的受激拉曼拉比脉冲更有效。与以前的实现相比，使用了超过200倍的转换自然线宽的大失谐。这种方法使得STIRAP适合于共振激光场填充在荧光激发态附近的原子，从而阻碍了STIRAP过程。我们利用该技术测量了激发态与运动基态的波函数重叠。这是使用捕获离子的力传感应用的重要应用，例如光子反冲光谱，其中信号与运动基态人口的消耗成正比。此外，基态种群的测定使离子温度的简单测量成为可能。
Efficient preparation and detection of the motional state of trapped ions is important in many experiments ranging from quantum computation to precision spectroscopy. We investigate the stimulated Raman adiabatic passage (STIRAP) technique for the manipulation of motional states in a trapped ion system. The presented technique uses a Raman coupling between two hyperfine ground states in 25Mg+, implemented with delayed pulses, which removes a single phonon independent of the initial motional state. We show that for a thermal probability distribution of motional states the STIRAP population transfer is more efficient than a stimulated Raman Rabi pulse on a motional sideband. In contrast to previous implementations, a large detuning of more than 200 times the natural linewidth of the transition is used. This approach renders STIRAP suitable for atoms in which resonant laser fields would populate nearby fluorescing excited states and thus impede the STIRAP process. We use the technique to measure the wavefunction overlap of excited motional states with the motional ground state. This is an important application for force sensing applications using trapped ions, such as photon recoil spectroscopy, in which the signal is proportional to the depletion of motional ground state population. Furthermore, a determination of the ground state population enables a simple measurement of the ion's temperature.