Fault tolerant authenticated quantum dialogue using logical Bell states

TL;DR

This paper introduces two fault-tolerant authenticated quantum dialogue protocols utilizing logical Bell states to securely communicate over collective noise channels, ensuring robustness against various attacks and preserving security despite classical channel eavesdropping.

Contribution

The paper proposes novel AQD protocols employing logical Bell states to combat specific collective noise types, enhancing security and fault tolerance in quantum communication.

Findings

Protocols successfully authenticate and exchange messages over noisy channels.

Protocols detect and prevent various quantum and classical attacks.

Logical Bell states improve robustness against collective noise.

Abstract

Two fault tolerant authenticated quantum dialogue (AQD) protocols are proposed in this paper by employing logical Bell states as the quantum resource, which combat the collective-dephasing noise and the collective-rotation noise, respectively. The two proposed protocols each can accomplish the mutual identity authentication and the dialogue between two participants simultaneously and securely over one kind of collective noise channels. In each of two proposed protocols, the information transmitted through the classical channel is assumed to be eavesdroppable and modifiable. The key for choosing the measurement bases of sample logical qubits is pre-shared privately between two participants. The Bell state measurements rather than the four-qubit joint measurements are adopted for decoding. The two participants share the initial states of message logical Bell states with resort to the direct transmission of auxiliary logical Bell states so that the information leakage problem is avoided. The impersonation attack, the man-in-the-middle attack, the modification attack and the Trojan horse attacks from Eve all are detectable.