Secure Multi-Party Quantum Conference and Xor Computation

TL;DR

This paper introduces secure multi-party quantum conference and XOR computation protocols that are secure against certain attacks, do not rely on entanglement, and are proven correct and secure.

Contribution

It generalizes the MDI-QD protocol to multi-party settings and proposes new secure quantum conference and XOR computation protocols without entanglement.

Findings

Protocols are secure against intercept-and-resend attacks.

Protocols are proven correct and secure.

No entanglement required for the protocols.

Abstract

Quantum conference is a process of securely exchanging messages between three or more parties, using quantum resources. A Measurement Device Independent Quantum Dialogue (MDI-QD) protocol, which is secure against information leakage, has been proposed (Quantum Information Processing 16.12 (2017): 305) in 2017, is proven to be insecure against intercept-and-resend attack strategy. We first modify this protocol and generalize this MDI-QD to a three-party quantum conference and then to a multi-party quantum conference. We also propose a protocol for quantum multi-party XOR computation. None of these three protocols proposed here use entanglement as a resource and we prove the correctness and security of our proposed protocols.