ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Technology, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain.
Istituto di Fotonica e Nanotecnologie (IFN)-CNR and Dipartimento di Fisica-Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133 Milano, Italy.
Phys Rev Lett. 2019 Aug 23;123(8):080502. doi: 10.1103/PhysRevLett.123.080502.
We report on the quantum storage of a heralded frequency-multiplexed single photon in an integrated laser-written rare-earth doped waveguide. The single photon contains 15 discrete frequency modes separated by 261 MHz and spanning across 4 GHz. It is obtained from a nondegenerate photon pair created via cavity-enhanced spontaneous down-conversion, where the heralding photon is at telecom wavelength and the heralded photon is at 606 nm. The frequency-multimode photon is stored in a praseodymium-doped waveguide using the atomic frequency comb (AFC) scheme, by creating multiple combs within the inhomogeneous broadening of the crystal. Thanks to the intrinsic temporal multimodality of the AFC scheme, each spectral bin includes 9 temporal modes, such that the total number of stored modes is about 130. We demonstrate that the storage preserves the nonclassical properties of the single photon, and its normalized frequency spectrum.
我们报告了在集成激光写入的稀土掺杂波导中对一个被标记的频率复用单光子的量子存储。该单光子包含 15 个离散的频率模式，间隔 261MHz，跨度为 4GHz。它是通过腔增强自发下转换产生的非简并光子对获得的，其中标记光子位于电信波长，而被标记的光子位于 606nm。通过在晶体的非均匀展宽内创建多个梳状结构，利用原子频梳（AFC）方案将多模光子存储在掺镨波导中。由于 AFC 方案的固有时间多模性，每个光谱-bin 包含 9 个时间模式，因此存储的模式总数约为 130 个。我们证明了存储可以保留单光子的非经典特性及其归一化频率谱。
