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Design of an Integrated Bell-State Analyzer on a Thin-Film Lithium Niobate Platform

TitleDesign of an Integrated Bell-State Analyzer on a Thin-Film Lithium Niobate Platform
Publication TypeJournal Article
Year of Publication2022
AuthorsU. Saha, and E. Waks
JournalIEEE Photonics J.
Volume14
Date PublishedFEB
Type of ArticleArticle
ISSN1943-0655
KeywordsBell-state analyzer, Couplings, entanglement, ions, Lithium niobate, optical waveguides, Photonics, polarization qubits, polarization-independent directional coupler, Ports (computers), QUBIT, scalable quantum computing, thin-film lithium niobate, trapped ions
Abstract

Trapped ions are excellent candidates for quantum computing and quantum networks because of their long coherence times, ability to generate entangled photons as well as high fidelity single- and two-qubit gates. To scale up trapped ion quantum computing, we need a Bell-state analyzer on a reconfigurable platform that can herald high fidelity entanglement between ions. In this work, we design a photonic Bell-state analyzer on a reconfigurable thin-film lithium niobate platform for polarization-encoded qubits. We optimize the device to achieve high fidelity entanglement between two trapped ions and find >99% fidelity. Apart from that, the directional coupler used in our design can achieve any polarization-independent power splitting ratio which can have a rich variety of applications in the integrated photonic technology. The proposed device can scale up trapped ion quantum computing as well as other optically active spin qubits, such as color centers in diamond, quantum dots, and rare-earth ions.

DOI10.1109/JPHOT.2021.3136502