论文标题
高维离散的傅里叶变换门带有量子频率处理器
High-dimensional discrete Fourier transform gates with the quantum frequency processor
论文作者
论文摘要
离散的傅立叶变换（DFT）在光子量子信息中具有基本兴趣，但是将其扩展到高维度的能力在很大程度上取决于物理编码，而在频率箱等新兴平台中缺乏实际食谱。在这封信中，我们表明D-Point频率键DFT可以通过固定的三成分量子处理器（QFP）实现，只需通过添加到Electro-Ectro-Optic调制指示D中的每个射频谐波，每次d中的每次增量增加。我们在数值模拟中验证栅极的保真度f> 0.9997和成功概率P> 0.965至d = 10，并实验实现了D = 3的解决方案，利用与平行DFTS的测量值来量化纠缠并对多个两倍频率键态执行全部断层扫描。我们的结果为量子通信和网络中的高维频率箱协议提供了新的机会。
The discrete Fourier transform (DFT) is of fundamental interest in photonic quantum information, yet the ability to scale it to high dimensions depends heavily on the physical encoding, with practical recipes lacking in emerging platforms such as frequency bins. In this Letter, we show that d-point frequency-bin DFTs can be realized with a fixed three-component quantum frequency processor (QFP), simply by adding to the electro-optic modulation signals one radio-frequency harmonic per each incremental increase in d. We verify gate fidelity F > 0.9997 and success probability P > 0.965 up to d = 10 in numerical simulations, and experimentally implement the solution for d = 3, utilizing measurements with parallel DFTs to quantify entanglement and perform full tomography of multiple two-photon frequency-bin states. Our results furnish new opportunities for high-dimensional frequency-bin protocols in quantum communications and networking.
