A thin film lithium niobate near-infrared platform for multiplexing quantum nodes

Daniel Assumpcao (), Dylan Renaud (), Aida Baradari, Beibei Zeng, Chawina De-Eknamkul, C. J. Xin, Amirhassan Shams-Ansari, David Barton, Bartholomeus Machielse and Marko Loncar ()
Additional contact information
Daniel Assumpcao: Harvard University
Dylan Renaud: Harvard University
Aida Baradari: Harvard University
Beibei Zeng: AWS Center for Quantum Networking
Chawina De-Eknamkul: AWS Center for Quantum Networking
C. J. Xin: Harvard University
Amirhassan Shams-Ansari: DRS Daylight Solutions
David Barton: Harvard University
Bartholomeus Machielse: AWS Center for Quantum Networking
Marko Loncar: Harvard University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Practical quantum networks will require multi-qubit quantum nodes. This in turn will increase the complexity of the photonic circuits needed to control each qubit and require strategies to multiplex memories. Integrated photonics operating at visible to near-infrared (VNIR) wavelength range can provide solutions to these needs. In this work, we realize a VNIR thin-film lithium niobate (TFLN) integrated photonics platform with the key components to meet these requirements, including low-loss couplers ( 20 dB extinction), and high-bandwidth electro-optic modulators (>50 GHz). With these devices, we demonstrate high-efficiency and CW-compatible frequency shifting (>50% efficiency at 15 GHz), as well as simultaneous laser amplitude and frequency control. Finally, we highlight an architecture for multiplexing quantum memories and outline how this platform can enable a 2-order of magnitude improvement in entanglement rates over single memory nodes. Our results demonstrate that TFLN can meet the necessary performance and scalability benchmarks to enable large-scale quantum nodes.

Date: 2024
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DOI: 10.1038/s41467-024-54541-2

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