标题： 在频域中创建和操作纠缠的光学量子比特 显示英文标题

标题： Creating and manipulating entangled optical qubits in the frequency domain

摘要： 射频相位调制频率纠缠光子会在频率域中产生双光子干涉图样。 在最近的实验中，该图样是通过窄带频率滤波器测量的，这些滤波器选择属于给定频率区间的光子。 在这里，我们展示如何通过使用称为交织器的周期性频率滤波器将光子分组为偶数和奇数频率。 在我们的理论分析中，我们展示了如何将高维光子态简化为有效的二维状态。 这对于量子密码学或量子非定域性的低维测试等应用具有重要意义。 然后我们报告了这一提议的实验实现。 观察到的双光子干涉图样以及CHSH不等式的违反——最简单的二元结果贝尔不等式——与理论预测相符。 显示英文摘要

摘要： Radio-frequency phase modulation of frequency entangled photons leads to a two-photon interference pattern in the frequency domain. In recent experiments, the pattern was measured with narrow-band frequency filters which select photons belonging to a given frequency bin. Here we show how photons can be grouped into even and odd frequencies by using periodic frequency filters called interleavers. In our theoretical analysis we show how this reduces the high-dimensional photon state to an effective two-dimensional state. This is of interest for applications such as quantum cryptography or low-dimensional tests of quantum nonlocality. We then report an experimental realization of this proposal. The observed two-photon interference pattern and violation of the CHSH inequality -- the simplest binary-outcome Bell inequality -- are in good agreement with the theoretical predictions.