Quantum information technology with Sagnac interferometer: Interaction-free measurement, quantum key distribution and quantum secret sharing

TL;DR

This paper introduces optical setups based on Sagnac interferometers for quantum information tasks like interaction-free measurement, quantum key distribution, and secret sharing, offering alternatives to traditional interferometers.

Contribution

It presents novel Sagnac interferometer configurations for quantum protocols, expanding the toolkit beyond common interferometers like Mach-Zehnder and Michelson.

Findings

Successful design of Sagnac-based quantum protocols

Clear explanation of quantum protocols using Sagnac interferometers

Potential for improved stability and performance in quantum communication

Abstract

The interferometry of single-photon pulses has been used to implement quantum technology systems, like quantum key distribution, interaction-free measurement and some other quantum communication protocols. In most of these implementations, Mach-Zehnder, Michelson and Fabry-Perot interferometers are the most used. In this work we present optical setups for interaction-free measurement, quantum key distribution and quantum secret sharing using the Sagnac interferometer. The proposed setups are described as well the quantum protocols using them are explained.