An Integrated Bell-State Analyzer on a Thin Film Lithium Niobate Platform

TL;DR

This paper presents a reconfigurable thin film lithium niobate platform for a high-fidelity Bell-state analyzer, enabling scalable entanglement generation for trapped ion quantum computing and other spin qubits.

Contribution

The work introduces a novel integrated photonic Bell-state analyzer on a thin film lithium niobate platform with >99% fidelity, advancing scalable quantum information processing.

Findings

Achieved >99% fidelity in entanglement generation

Designed a reconfigurable platform for polarization-encoded qubits

Applicable to various optically active spin qubits

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.