Experimental observation of coherent interaction between laser and erbium ions ensemble doped in fiber at sub 10 mK

Rare-earth ions doped in solid-state materials are considered promising candidates for quantum information applications, especially for photonic quantum memory. Among them, erbium ions doped in an optical fiber have attracted a lot of attentions due to their ability to provide efficient photon-atom...

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Bibliographic Details
Published in:	Science China. Information sciences 2020-08, Vol.63 (8), p.180505, Article 180505
Main Authors:	Xi, Qi, Wei, Shihai, Yuan, Chenzhi, Zhang, Xueying, Wang, You, Song, Haizhi, Deng, Guangwei, Jing, Bo, Oblak, Daniel, Zhou, Qiang
Format:	Article
Language:	eng
Subjects:	C band Coherence Computer Science Dipole moments Erbium Information Systems and Communication Service Lasers Long fibers Magnetic fields Metal ions Nutation Optical fibers Photons Quantum phenomena Rare earth elements Research Paper Solid state Telecommunications
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Summary:	Rare-earth ions doped in solid-state materials are considered promising candidates for quantum information applications, especially for photonic quantum memory. Among them, erbium ions doped in an optical fiber have attracted a lot of attentions due to their ability to provide efficient photon-atom interaction on a telecom-C band compatible transition. The coherent photon-atom interaction, which is crucial for quantum memory, has not yet been investigated for erbium ions doped in fiber at the temperature of sub 10 mK with the magnetic environment. In this paper, we experimentally observe optical nutation, which results from the coherent interaction between laser and erbium ions ensemble, in a piece of 9.5-m-long fiber with the erbium concentration of 200 ppm. We also extract the transition dipole moment from the results of optical nutation and further investigate its dependence on laser wavelength and magnetic field. A transition dipole moment of (3.424±0.019)×10 −32 C·m is obtained at the wavelength of 1537 nm and magnetic field of 0.2 T. Our results could pave the way for realizing solid-state quantum networks at telecom-C band.
ISSN:	1674-733X 1869-1919