Efficient storage of telecom-band quantum optical information represents a crucial milestone for establishing distributed quantum optical networks. Erbium ions in crystalline hosts provide a promising platform for telecom quantum memories; however, their practical applications have been hindered by demanding operational conditions, such as ultra-high magnetic fields and ultra-low temperatures. In this work, we demonstrate the storage of telecom photonic qubits encoded in polarization, frequency, and time-bin bases. Using the atomic frequency comb protocol in an Er3+-doped crystal, we developed a memory initialization scheme that improves storage efficiency by over an order of magnitude under practical experimental conditions. Quantum process tomography further confirms the memory's performance, achieving a fidelity exceeding 92%.
@article{arxiv.2412.05480,
title = {Efficient Storage of Multidimensional Telecom Photons in a Solid-State Quantum Memory},
author = {Zongfeng Li and Yisheng Lei and Trevor Kling and Mahdi Hosseini},
journal= {arXiv preprint arXiv:2412.05480},
year = {2024}
}