Semantic Security with Unreliable Entanglement Assistance: Interception and Loss

TL;DR

This paper investigates semantic security in quantum communication with unreliable entanglement assistance, analyzing models with interception and dissipation, and derives achievable rates demonstrating advantages over traditional methods.

Contribution

It introduces models for semantic security with unreliable entanglement, deriving achievable rate regions and comparing them to time division strategies.

Findings

Achievable rates are derived for both interception and dissipation models.

Under interception, the achievable rate region boundary can be disconnected.

In the passive dissipation model, the rate region outperforms time division.

Abstract

Semantic security is considered with unreliable entanglement assistance, due to one of two reasons: Interception or loss. We consider two corresponding models. In the first model, Eve may intercept the entanglement resource. In the second model, Eve is passive, and the resource may dissipate to the environment beyond her reach. We derive achievable rates for both models, subject to a maximal error criterion and semantic security. As an example, we consider the amplitude damping channel. Under interception, time division is not necessarily possible, and the boundary of our achievable region is disconnected. In the passive model, our rate region outperforms time division.