Improving the phase super-sensitivity of squeezing-assisted interferometers by squeeze factor unbalancing
Improving the phase super-sensitivity of squeezing-assisted interferometers by squeeze factor unbalancing
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DOI：
10.1088/1367-2630/aa53d1
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发表时间：
2016-07
影响因子：
3.3
通讯作者：
M. Manceau;F. Khalili;M. Chekhova
中科院分区：
文献类型：
--
作者：
M. Manceau;F. Khalili;M. Chekhova
本文从理论上研究了由两个参量放大器级联而成的SU（1，1）干涉仪以及前加挤压器后加反挤压器的普通SU（2）干涉仪的灵敏度特性。几种可能的实验配置被认为是，如种子光束，直接或零差检测方案的存在或不存在。在所有情况下，我们制定的最佳条件，以实现相位超灵敏度，这意味着灵敏度克服散粒噪声限制。我们表明，对于第一个参量放大器的给定增益，通过增加第二个放大器的增益来使干涉仪不平衡可以改善干涉仪的特性。特别地，通过增益不平衡可以实现更宽的超灵敏度相位范围和更好的总体灵敏度。
The sensitivity properties of an SU(1,1) interferometer made of two cascaded parametric amplifiers, as well as of an ordinary SU(2) interferometer preceded by a squeezer and followed by an anti-squeezer, are theoretically investigated. Several possible experimental configurations are considered, such as the absence or presence of a seed beam, direct or homodyne detection scheme. In all cases we formulate the optimal conditions to achieve phase super-sensitivity, meaning a sensitivity overcoming the shot-noise limit. We show that for a given gain of the first parametric amplifier, unbalancing the interferometer by increasing the gain of the second amplifier improves the interferometer properties. In particular, a broader super-sensitivity phase range and a better overall sensitivity can be achieved by gain unbalancing.