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首页> 外文期刊>new journal of physics >Gate fidelity, dephasing, and 'magic' trapping of optically trapped neutral atom
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Gate fidelity, dephasing, and 'magic' trapping of optically trapped neutral atom

机译：光捕获中性原子的栅极保真度、退相和“魔术”捕获

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The fidelity of the gate operation and the coherence time of neutral atoms trapped in an optical dipole trap are figures of merit for the applications. The motion of the trapped atom is one of the key factors which influences the gate fidelity and coherence time. The motion has been considered as a classical oscillator in analyzing the influence. Here we treat the motion of the atom as a quantum oscillator. The population on the vibrational states of the atom are considered in analyzing the gate fidelity and decoherence. We show that the fidelity of a coherent rotation gate is dramatically limited by the temperature of a thermally trapped atom. We also show that the dephasing between the two hyperfine states due to the thermal motion of the atom could rephase naturally if the differential frequency shift is stable and the vibrational states do not change. The decoherence due to the fluctuations of the trap laser intensity is also discussed. Both the gate fidelity and coherence time can be dramatically enhanced by cooling the atom into vibrational ground states and/or by using a blue-detuned trap. More importantly, we propose a 'magic' trapping condition by preparing the atom into specific vibrational states.
机译：栅极操作的保真度和被困在光学偶极阱中的中性原子的相干时间是应用的品质因数。被俘原子的运动是影响栅极保真度和相干时间的关键因素之一。在分析影响时，该运动被认为是经典振荡器。在这里，我们将原子的运动视为量子振荡器。在分析栅极保真度和退相干性时，考虑了原子振动态的总体性。我们表明，相干旋转栅极的保真度受到热捕获原子温度的极大限制。我们还表明，如果差分频移稳定且振动态不改变，则由于原子的热运动导致的两个超精细态之间的退相可以自然地重新相位。还讨论了由于陷阱激光强度波动引起的退相干。通过将原子冷却到振动基态和/或使用蓝色失谐陷阱，可以显著提高栅极保真度和相干时间。更重要的是，我们提出了一个“神奇”的捕获条件，将原子准备成特定的振动状态。

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