An Atomic Frequency Comb Memory in Rare-Earth-Doped Thin-Film Lithium Niobate
- Subhojit DuttaSubhojit DuttaDepartment of Electrical and Computer Engineering, Institute for Research in Electronics and Applied Physics, and Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, United StatesMore by Subhojit Dutta
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- Yuqi ZhaoYuqi ZhaoDepartment of Electrical and Computer Engineering, Institute for Research in Electronics and Applied Physics, and Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, United StatesMore by Yuqi Zhao
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- Uday SahaUday SahaDepartment of Electrical and Computer Engineering, Institute for Research in Electronics and Applied Physics, and Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, United StatesMore by Uday Saha
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- Demitry FarfurnikDemitry FarfurnikDepartment of Electrical and Computer Engineering, Institute for Research in Electronics and Applied Physics, and Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, United StatesMore by Demitry Farfurnik
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- Elizabeth A. GoldschmidtElizabeth A. GoldschmidtDepartment of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United StatesUS Army Research Laboratory, Adelphi, Maryland 20783, United StatesMore by Elizabeth A. Goldschmidt
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- Edo Waks*Edo Waks*Email: [email protected]Department of Electrical and Computer Engineering, Institute for Research in Electronics and Applied Physics, and Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, United StatesMore by Edo Waks
Abstract
Quantum memories are a key building block for optical quantum computers and quantum networks. Rare-earth ion-doped crystals are a promising material to achieve quantum memory using an atomic frequency comb protocol. However, current atomic frequency comb memories typically use bulk materials or waveguides with large cross sections or rely on fabrication techniques not easily adaptable to wafer scale processing. Here, we demonstrate a compact chip-integrated atomic frequency comb in rare-earth-doped thin-film lithium niobate. Our optical memory exhibits a broad storage bandwidth exceeding 100 MHz and optical storage time as long as 250 ns. The enhanced optical confinement in this device leads to three orders of magnitude reduction in optical power required for a coherent control as compared to ion-diffused waveguides. These compact atomic frequency comb memories pave the way toward scalable, highly efficient, electro-optically tunable quantum photonic systems that can store and manipulate light on a compact chip.
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