Relationship between quantum repeating devices and quantum seals

TL;DR

This paper explores the close relationship between quantum repeating devices and quantum seals, showing how theories from one can inform the other, and discusses implications for security and fidelity bounds.

Contribution

It demonstrates the application of quantum seal security bounds to quantum repeating devices, revealing potential violations of fidelity bounds in certain decoding scenarios.

Findings

Fidelity bounds can be violated in quantum repeating devices when decoding classical information.

Security bounds for quantum sealing protocols are established.

Theoretical connection between quantum repeating devices and quantum seals is demonstrated.

Abstract

It is revealed that quantum repeating devices and quantum seals have a very close relationship, thus the theory in one field can be applied to the other. Consequently, it is shown that the fidelity bounds and optimality of quantum repeating devices can be violated when they are used for decoding classical information from quantum states, and security bounds for protocols sealing quantum data exist.