Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 49: Quantum Communication, Networks, Repeaters, & QKD I
Q 49.1: Vortrag
Donnerstag, 5. März 2026, 11:00–11:15, P 10
Optical quantum storage of cold atomic ensemble mediated by light-induced fictitious magnetic field — Liang Dong1, Linyu Chen1, Xingchang Wang1, Xinyun Liang1, •Ying Zuo2, Georgios Siviloglou2,3, and JieFei Chen1,2 — 1Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China — 2International Quantum Academy, Shenzhen 518048, China — 3Department of Physics, University of Crete, Heraklion, Greece
Optical quantum memory is a critical component in quantum computing, sensing, and communication. A major obstacle limiting practical quantum memory based on cold atomic ensemble is the reduced storage lifetime caused by spatiotemporal inhomogeneity in ambient magnetic fields along the elongated atomic cloud. To address this challenge, we demonstrate a method to prolong the storage lifetime of single-photon quantum states using a combination of optically induced virtual magnetic fields and DC bias field. By precisely tailoring the polarization, spatial distribution, and temporal waveform of the AC Stark beam, the generated virtual magnetic field compensates in real-time for spatial inhomogeneities and temporal fluctuations. This high-speed, high-spatial-resolution compensation technique overcomes the limitations of conventional current-coil methods, such as slow response and low spatial resolution, effectively suppressing decoherence in magnetically sensitive quantum states. Furthermore, we propose a scheme for storing time-bin entangled photon pairs prepared at two distinct time bins.
Keywords: Optical quantum storage; Cold atomic ensemble; Larmor precession; Atomic spin wave