论文标题
通过穿过纳米纤维耦合原子的光的挤压光谱来揭开两光子纠缠
Unraveling two-photon entanglement via the squeezing spectrum of light traveling through nanofiber-coupled atoms
论文作者
论文摘要
我们观察到，通过与光学纳米纤维耦合的原子集合一起传播的弱引导光场表现出正交挤压。从测得的挤压光谱中，我们可以直接访问两光子波函数的能量时纠缠部分的相位和振幅，该部分来自通过整体的光子的密切相关的传输。对于小原子集合，我们观察到接近原子过渡线的光谱，而对于足够大的合奏，观察到侧带，与我们的理论预测一致。此外，我们改变了相对于原子共振的探针光的失沟，并推断了纠缠的两光子波函数的相位。从光谱的幅度和相位，我们重建了时域波函数的实体和虚构部分。我们对纠缠的两光子组件的表征构成了量子光学设备的诊断工具。
We observe that a weak guided light field transmitted through an ensemble of atoms coupled to an optical nanofiber exhibits quadrature squeezing. From the measured squeezing spectrum we gain direct access to the phase and amplitude of the energy-time entangled part of the two-photon wavefunction which arises from the strongly correlated transport of photons through the ensemble. For small atomic ensembles we observe a spectrum close to the lineshape of the atomic transition, while sidebands are observed for sufficiently large ensembles, in agreement with our theoretical predictions. Furthermore, we vary the detuning of the probe light with respect to the atomic resonance and infer the phase of the entangled two-photon wavefunction. From the amplitude and the phase of the spectrum, we reconstruct the real- and imaginary part of the time-domain wavefunction. Our characterization of the entangled two-photon component constitutes a diagnostic tool for quantum optics devices.
