Phase control and diagnostic of quantum mechanical superposition states
Phase control and diagnostic of quantum mechanical superposition states
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DOI：
10.1103/physreva.87.013430
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发表时间：
2013-01
影响因子：
2.9
通讯作者：
C. Basler;K. Reininger;F. Meinert;P. Ghosh;H. Helm
中科院分区：
文献类型：
--
作者：
C. Basler;K. Reininger;F. Meinert;P. Ghosh;H. Helm
我们报告了电磁感应透明中出现的量子力学叠加态中相位 η 的控制实验，|ψ> = (|1> + eiη|2>)/√2。我们根据自发发射和光场在选择光学暗和亮叠加中所起的测量作用来解释我们的发现。引入了相位切换工具，可以快速测量暗态最小值的绝对深度及其在频率尺度上的绝对位置，而无需使激光器失谐。相位切换技术允许人们以一种微创的方式确定系统的量子力学叠加态系综中的相对相位 η。
We report experiments on the control of the phase η in quantum mechanical superposition states which emerge in electromagnetically induced transparency, |ψ〉 = (|1〉 + eiη|2〉)/√2. We interpret our findings in terms of the measurement role that spontaneous emission and the light fields play in selecting the optically dark and bright superpositions. A phase-switching tool is introduced which enables the rapid measurement of the absolute depth of the dark-state minimum and its absolute position on the frequency scale without detuning the lasers. The phase-switching technique allows one to determine the relative phase η in an ensemble of quantum mechanical superposition states of a system in a minimally invasive way.