【摘要】：低頻信號(hào)測(cè)量在引力波探測(cè)、生物成像及磁場(chǎng)測(cè)量等方面具有重要的應(yīng)用價(jià)值.本文利用非簡(jiǎn)并光學(xué)參量放大器獲得了低頻壓縮態(tài)光場(chǎng),在頻率19 kHz處直接測(cè)到的壓縮度為(7.1±0.1)dB;將產(chǎn)生的正交位相壓縮態(tài)光場(chǎng)注入到馬赫-曾德爾干涉儀中,實(shí)現(xiàn)了超越散粒噪聲極限(3.0±0.4)dB的聲頻相位信號(hào)的測(cè)量.本實(shí)驗(yàn)的開展為低頻壓縮光的產(chǎn)生及基于低頻壓縮光的聲頻信號(hào)測(cè)量提供了一定技術(shù)支撐,并且此技術(shù)有望擴(kuò)展到磁場(chǎng)、空間小位移等其他物理量的量子精密測(cè)量方案中.
[Abstract]:Low frequency signal measurement has important application value in gravitational wave detection, biological imaging and magnetic field measurement. In this paper, the low frequency squeezed state light field is obtained by using a nondegenerate optical parametric amplifier. The squeezing degree measured directly at the frequency of 19 kHz is (7.1 鹵0.1) dB;. The generated quadrature phase squeezed state light field is injected into the Mach Zehnder interferometer, and the measurement of the audio phase signal beyond the shot noise limit (3. 0 鹵0. 4) dB is realized. The development of this experiment provides a technical support for the generation of low-frequency compressed light and the measurement of audio signal based on low-frequency compression light, and this technique is expected to be extended to the quantum precision measurement scheme of other physical quantities such as magnetic field, small spatial displacement and so on.
【作者單位】： 山西大學(xué)光電研究所量子光學(xué)與光量子器件國(guó)家重點(diǎn)實(shí)驗(yàn)室極端光學(xué)協(xié)同創(chuàng)新中心;
【基金】：國(guó)家自然科學(xué)基金(批準(zhǔn)號(hào):61405108,11674205,11604189);國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目(批準(zhǔn)號(hào):91536222) 國(guó)家重點(diǎn)研發(fā)計(jì)劃(批準(zhǔn)號(hào):2016YFA0301404) 國(guó)家高技術(shù)研究發(fā)展計(jì)劃(批準(zhǔn)號(hào):2015AA8112008) 山西省高�？萍紕�(chuàng)新項(xiàng)目(批準(zhǔn)號(hào):2015103)資助的課題~~
【分類號(hào)】：O432.2

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