Detection Loss Tolerant Supersensitive Phase Measurement with an SU(1,1) Interferometer.
Detection Loss Tolerant Supersensitive Phase Measurement with an SU(1,1) Interferometer.
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DOI：
10.1103/physrevlett.119.223604
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发表时间：
2017-05
影响因子：
8.6
通讯作者：
M. Manceau;G. Leuchs;F. Khalili;M. Chekhova
中科院分区：
文献类型：
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作者：
M. Manceau;G. Leuchs;F. Khalili;M. Chekhova
在由两个级联退化参数放大器组成的非种子SU（1,1）干涉仪中，在输出处直接检测，我们证明了相位灵敏度克服了弹噪声限制2.3 dB。该干涉仪具有很强的不平衡性，第二个放大器的参数增益比第一个放大器的增益高出2倍，这使得该方案对检测损耗具有极强的容忍度。我们表明，通过增加第二放大器的增益，即使在检测损失高达80%的情况下，干涉仪的相位超灵敏度也可以保持。这一发现可以大大提高最先进的干涉测量技术，在光谱范围内实现低效率检测的亚散噪声相位灵敏度，并允许扩展到量子成像。
In an unseeded SU(1,1) interferometer composed of two cascaded degenerate parametric amplifiers, with direct detection at the output, we demonstrate a phase sensitivity overcoming the shot noise limit by 2.3 dB. The interferometer is strongly unbalanced, with the parametric gain of the second amplifier exceeding the gain of the first one by a factor of 2, which makes the scheme extremely tolerant to detection losses. We show that by increasing the gain of the second amplifier, the phase supersensitivity of the interferometer can be preserved even with detection losses as high as 80%. This finding can considerably improve the state-of-the-art interferometry, enable sub-shot-noise phase sensitivity in spectral ranges with inefficient detection, and allow extension to quantum imaging.