Approaching the Heisenberg Limit without Single-Particle Detection
Approaching the Heisenberg Limit without Single-Particle Detection
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DOI：
10.1103/physrevlett.116.053601
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发表时间：
2016-02-02
影响因子：
8.6
通讯作者：
Schleier-Smith, Monika
中科院分区：
文献类型：
--
作者：
Davis, Emily;Bentsen, Gregory;Schleier-Smith, Monika
我们提出了一种量子相位估计的方法，可以达到海森堡极限附近的精度，而不需要单粒子分辨状态检测。我们表明，“单轴扭曲”的相互作用，众所周知的产生自旋压缩的原子系综，也可以放大的纠缠增强干涉仪的输出信号，以方便读出。将这种基于相互作用的读出应用于过度压缩的非高斯态，产生了相位灵敏度的海森堡缩放，其在存在与未纠缠系综的量子投影噪声一样大的检测噪声的情况下持续存在。即使在耗散实现中-例如，在光腔中采用光介导的相互作用或里德伯修饰-该方法显著地放宽了光谱学所需的检测分辨率，超过了标准量子极限。
We propose an approach to quantum phase estimation that can attain precision near the Heisenberg limit without requiring single-particle-resolved state detection. We show that the "one-axis twisting" interaction, well known for generating spin squeezing in atomic ensembles, can also amplify the output signal of an entanglement-enhanced interferometer to facilitate readout. Applying this interaction-based readout to oversqueezed, non-Gaussian states yields a Heisenberg scaling in phase sensitivity, which persists in the presence of detection noise as large as the quantum projection noise of an unentangled ensemble. Even in dissipative implementations-e.g., employing light-mediated interactions in an optical cavity or Rydberg dressing-the method significantly relaxes the detection resolution required for spectroscopy beyond the standard quantum limit.