Quantum Zeno Repeaters

TL;DR

This paper introduces a quantum repeater protocol utilizing the quantum Zeno effect, enabling high-fidelity entanglement swapping with minimal operations, simplifying quantum repeater design for long-distance quantum communication.

Contribution

It presents a novel entanglement swapping protocol based on QZE that requires only simple measurements and rotations, eliminating the need for controlled gates and reducing circuit complexity.

Findings

Achieves almost unit fidelity in entanglement swapping.

Works effectively over multiple repeater stations.

Reduces quantum circuit complexity for repeaters.

Abstract

Quantum repeaters pave the way for long-distance quantum communications and quantum Internet, and the idea of quantum repeaters is based on entanglement swapping which requires the implementation of controlled quantum gates. Frequently measuring a quantum system affects its dynamics which is known as the quantum Zeno effect (QZE). Beyond slowing down its evolution, QZE can be used to control the dynamics of a quantum system by introducing a carefully designed set of operations between measurements. Here, we propose an entanglement swapping protocol based on QZE, which achieves almost unit fidelity. Implementation of our protocol requires only simple frequent threshold measurements and single particle rotations. We extend the proposed entanglement swapping protocol to a series of repeater stations for constructing quantum Zeno repeaters which also achieve almost unit fidelity regardless of the number of repeaters. Requiring no controlled gates, our proposal reduces the quantum circuit complexity of quantum repeaters. Our work has potential to contribute to long distance quantum communications and quantum computing via quantum Zeno effect.