SmartCut Er:LiNbO3 with high optical coherence enabling optical thickness control

• URL: http://arxiv.org/abs/2206.12645v1
• Date: Sat, 25 Jun 2022 13:02:07 GMT
• Title: SmartCut Er:LiNbO3 with high optical coherence enabling optical thickness control
• Authors: Sihao Wang, Likai Yang, Mohan Shen, Wei Fu, Yuntao Xu, Rufus L. Cone, Charles W. Thiel, Hong Tang
• Abstract summary: Integrated photonics capable of incorporating rare earth ions with high optical coherence is desirable for realizing efficient quantum transducers, compact quantum memories, and hybrid quantum systems. We describe a photonic platform based on the SmartCut erbium-doped lithium niobate thin film, and explore its stable optical transitions at telecom wavelength in a dilution refrigerator.
• Score: 0.5130440339897477
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Integrated photonics capable of incorporating rare earth ions with high optical coherence is desirable for realizing efficient quantum transducers, compact quantum memories, and hybrid quantum systems. Here we describe a photonic platform based on the SmartCut erbium-doped lithium niobate thin film, and explore its stable optical transitions at telecom wavelength in a dilution refrigerator. Optical coherence time of up to 180\,$\mu$s, rivaling the value of bulk crystals, is achieved in optical ridge waveguides and ring resonators. With this integrated platform, we demonstrate tunable light-ion interaction and flexible control of optical thickness by exploiting long waveguides, whose lengths are in principle variable. This unique ability to obtain high optical density using a low concentration ions further leads to the observation of multi-echo pulse trains in centimeter-long waveguides. Our results establish a promising photonic platform for quantum information processing with rare earth ions.

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