Sensitivity of quantum gate fidelity to laser phase and intensity noise
Sensitivity of quantum gate fidelity to laser phase and intensity noise
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DOI：
10.1103/physreva.107.042611
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发表时间：
2022-10
影响因子：
2.9
通讯作者：
X. Jiang;J. Scott;M. Friesen;M. Saffman
中科院分区：
文献类型：
--
作者：
X. Jiang;J. Scott;M. Friesen;M. Saffman
中性原子量子比特的栅极运算保真度经常受到激光驱动波动的限制。在这里，我们量化了量子门保真度对激光相位和强度噪声的灵敏度。我们首先建立模型来识别激光自外差噪声光谱中观察到的特征，重点研究白噪声和伺服颠簸的影响。在弱噪声状态下，良好稳定激光器的特征，我们证明了基于主方程微扰解的解析理论与包含相位噪声的数值模拟非常吻合。我们计算了单光子和双光子拉比振荡的量子门保真度，并表明它们可以通过适当选择相对于谱噪声峰值的拉比频率来增强。在谱支持度小于拉比频率的情况下，分析了强度噪声的影响。我们的结果确定了实现所需门保真度所需的激光噪声水平的要求。
The fidelity of gate operations on neutral atom qubits is often limited by fluctuations of the laser drive. Here, we quantify the sensitivity of quantum gate fidelities to laser phase and intensity noise. We first develop models to identify features observed in laser self-heterodyne noise spectra, focusing on the effects of white noise and servo bumps. In the weak-noise regime, characteristic of well-stabilized lasers, we show that an analytical theory based on a perturbative solution of a master equation agrees very well with numerical simulations that incorporate phase noise. We compute quantum gate fidelities for one- and two-photon Rabi oscillations and show that they can be enhanced by an appropriate choice of Rabi frequency relative to spectral noise peaks. We also analyze the influence of intensity noise with spectral support smaller than the Rabi frequency. Our results establish requirements on laser noise levels needed to achieve desired gate fidelities.