Qubit coherence times are critical to the performance of any robust quantum computing platform. For quantum information processing using arrays of polar molecules, a key performance parameter is the molecular rotational coherence time. We report a 93(7) ms coherence time for rotational state qubits of laser cooled CaF molecules in optical tweezer traps, over an order of magnitude longer than previous systems. Inhomogeneous broadening due to the differential polarizability between the qubit states is suppressed by tuning the tweezer polarization and applied magnetic field to a “magic” angle. The coherence time is limited by the residual differential polarizability, implying improvement with further cooling. A single spin-echo pulse is able to extend the coherence time to nearly half a second. The measured coherence times demonstrate the potential of polar molecules as high fidelity qubits.

中文翻译：

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光镊中极性分子的旋转相干时间

量子位相干时间对于任何强大的量子计算平台的性能都至关重要。对于使用极性分子阵列的量子信息处理，一个关键的性能参数是分子旋转相干时间。我们报告了光镊陷阱中激光冷却 CaF 分子的旋转状态量子位的 93(7) ms 相干时间，比以前的系统长一个数量级。通过将镊子极化和施加的磁场调整到“神奇”角度，可以抑制由于量子位状态之间的不同极化率引起的不均匀展宽。相干时间受残余微分极化率的限制，这意味着随着进一步冷却而改善。单个自旋回波脉冲能够将相干时间延长至近半秒。