Semiquantum private comparison via cavity QED

TL;DR

This paper introduces the first semiquantum private comparison protocol utilizing cavity QED, enabling limited quantum-capable parties to securely compare private data with a semi-honest third party, without complex quantum operations.

Contribution

It presents a novel semiquantum private comparison protocol based on cavity QED that requires no entanglement or complex quantum operations, enhancing practicality and security.

Findings

Protocol can compare private inputs securely.

Resistant to external and internal attacks.

Uses simple product states without entanglement.

Abstract

In this paper, we design the first semiquantum private comparison (SQPC) protocol which is realized via cavity quantum electrodynamics (QED) by making use of the evolution law of atom. With the help of a semi-honest third party (TP), the proposed protocol can compare the equality of private inputs from two semiquantum parties who only have limited quantum capabilities. The proposed protocol uses product states as initial quantum resource and employs none of unitary operations, quantum entanglement swapping operation or delay lines. Security proof turns out that it can defeat both the external attack and the internal attack.