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

Open Access

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

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Journal: IEEE Photonics Journal	Publication Date: Feb 1, 2022
Citations: 2	License type: CC BY 4.0

Affiliation: University of Maryland, College Park

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. 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]

Summary

Introduction

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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Conclusion