Measurement Device Independent Quantum Private Query with Qutrits

TL;DR

This paper introduces a measurement device independent quantum private query protocol using qutrits, comparing its security and privacy features to qubits, and finds that higher dimensions do not always guarantee better security in QPQ.

Contribution

It presents a novel MDI QPQ protocol with qutrits and analyzes its security and privacy trade-offs compared to qubits.

Findings

Qutrits can offer better database security than qubits in some cases.

Additional measures are needed to protect client privacy with qutrits.

Higher dimensions do not universally improve security in QPQ.

Abstract

Measurement Device Independent Quantum Private Query (MDI QPQ) with qutrits is presented. We compare the database security and client's privacy in MDI QPQ for qubits with qutrits. For some instances, we observe that qutrit will provide better security for database than qubit. However, when it comes to the question of client's privacy we have to take additional measures in case of qutrit. Hence we conclude that though in case of Quantum Key Distribution (QKD) higher dimension provides better security but in case of QPQ this is not obvious.