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

Uday Saha,Edo Waks

doi:10.1109/jphot.2021.3136502

Uday Saha, Edo Waks

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https://doi.org/10.1109/jphot.2021.3136502

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Journal: IEEE Photonics Journal	Publication Date: Feb 1, 2022
Citations: 3	License type: CC BY 4.0

Affiliation: University of Maryland, College Park

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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. 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.

Highlights

T RAPPED ions are one of the most advanced platforms for quantum computing and quantum networks
The key optical component in these devices is the photonic Bellstate analyzer [12], which heralds the successful entanglement between distant qubits
Such entanglement provides a photonic interconnect between trapped ions, which can be used to scale up trapped ion quantum computers [2], [13] as well as enable long-distance quantum networks [10], [14]–[16]

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T RAPPED ions are one of the most advanced platforms for quantum computing and quantum networks They exhibit long coherence times [1]–[3], naturally emit photons entangled with their internal qubit memories [4]–[6], and support highfidelity single- and two-qubit gates [7], [8]. The key optical component in these devices is the photonic Bellstate analyzer [12], which heralds the successful entanglement between distant qubits Such entanglement provides a photonic interconnect between trapped ions, which can be used to scale up trapped ion quantum computers [2], [13] as well as enable long-distance quantum networks [10], [14]–[16]. To realize these interconnects in a scalable way requires compact reconfigurable chip-integrated devices that can perform Bellstate analysis between trapped ions at different nodes [10], [14]

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