论文标题
通过挤压光提高Kerr QND测量灵敏度
Improving Kerr QND measurement sensitivity via squeezed light
论文作者
论文摘要
在Ref [Phys。 Rev. A 106，013720]，理论上分析了光学量子的量子非降解测量方案，该方案在理论上分析了光学微孔子中使用互环响起的KERR非线性。结果表明，使用现代的高Q微孔子，可以比标准量子极限更好地达到灵敏度几倍。在这里，我们详细提出和分析该方案的明显改进版本。我们表明，通过在微孔子输出处使用该梁的探针梁的量子状态和该梁的抗方（参数放大），可以将测量不确定性降低约一个数量级。由此产生的灵敏度允许生成和验证多光子的非高斯量子状态，从而使此处考虑的方案在量子信息处理任务中变得有趣。
In ref [Phys. Rev. A 106, 013720], the scheme of quantum non-demolition measurement of optical quanta that uses a resonantly enhanced Kerr nonlinearity in optical microresonators was analyzed theoretically. It was shown that using the modern high-Q microresonators, it is possible to achieve the sensitivity several times better than the standard quantum limit. Here we propose and analyze in detail a significantly improved version of that scheme. We show, that by using a squeezed quantum state of the probe beam and the anti-squeezing (parametric amplification) of this beam at the output of the microresonator, it is possible to reduce the measurement imprecision by about one order of magnitude. The resulting sensitivity allows to generate and verify multi-photon non-Gaussian quantum states of light, making the scheme considered here interesting for the quantum information processing tasks.
