论文标题
在存在单光子损失的情况下，两光子吸收测量值
Two-photon absorption measurements in the presence of single-photon losses
论文作者
论文摘要
我们讨论如何在传输光场的测量中检测到挤压和相干状态的两光子吸收（TPA）。这样的测量通常会遭受相互竞争的损失机制，例如实验缺陷和样本本身内部的线性散射损失，这可能导致对两光子吸收横截面的评估不正确。我们评估了可以检测到TPA的灵敏度，并发现挤压真空或挤压相干状态的TPA灵敏度可以独立于在足够大的光子数字下与线性损失无关。特别是，这是针对光子数或抗方面正交数的测量结果的，在该测量中，大波动抵消并完全取消了由单个光子损失引起的降解。
We discuss how two-photon absorption (TPA) of squeezed and coherent states of light can be detected in measurements of the transmitted light fields. Such measurements typically suffer from competing loss mechanisms such as experimental imperfections and linear scattering losses inside the sample itself, which can lead to incorrect assessments of the two-photon absorption cross section. We evaluate the sensitivity with which TPA can be detected and find that TPA sensitivity of squeezed vacua or squeezed coherent states can become independent of linear losses at sufficiently large photon numbers. In particular, this happens for measurements of the photon number or of the anti-squeezed field quadrature, where large fluctuations counteract and exactly cancel the degradation caused by single photon losses.
