Davidson Omri, Yogev Ohad, Poem Eilon, Firstenberg Ofer
Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 7610001, Israel.
Phys Rev Lett. 2023 Jul 21;131(3):033601. doi: 10.1103/PhysRevLett.131.033601.
Efficient synchronization of single photons that are compatible with narrow band atomic transitions is an outstanding challenge, which could prove essential for photonic quantum information processing. Here we report on the synchronization of independently generated single photons using a room-temperature atomic quantum memory. The photon source and the memory are interconnected by fibers and employ the same ladder-level atomic scheme. We store and retrieve the heralded single photons with end-to-end efficiency of η_{e2e}=25% and final antibunching of g_{h}^{(2)}=0.023. Our synchronization process results in an over tenfold increase in the photon-pair coincidence rate, reaching a rate of more than 1000 detected synchronized photon pairs per second. The indistinguishability of the synchronized photons is verified by a Hong-Ou-Mandel interference measurement.
实现与窄带原子跃迁兼容的单光子的高效同步是一项极具挑战性的任务，而这对于光子量子信息处理可能至关重要。在此，我们报告了利用室温原子量子存储器对独立产生的单光子进行同步的情况。光子源和存储器通过光纤相互连接，并采用相同的阶梯能级原子方案。我们以ηe2e=25%的端到端效率存储和检索预示单光子，最终的反聚束特性为g(2)h=0.023。我们的同步过程使光子对符合率提高了十多倍，达到每秒检测到超过1000对同步光子对的速率。通过Hong-Ou-Mandel干涉测量验证了同步光子的不可区分性。
