Comment on "Masking quantum information is impossible"

TL;DR

This paper challenges the established no-masking theorem by demonstrating that the connection between quantum masking and qubit commitment is not universally valid, suggesting potential exceptions to previous limitations.

Contribution

It provides a counterexample or argument showing that quantum masking and qubit commitment are not necessarily linked as previously thought.

Findings

The no-masking theorem does not imply the impossibility of qubit commitment in all cases.

Quantum masking may have exceptions that allow for certain cryptographic protocols.

The paper clarifies the relationship between quantum masking and quantum cryptography.

Abstract

The no-masking theorem (Phys. Rev. Lett. 120, 230501 (2018)) claims that arbitrary quantum states cannot be masked. Based on this result, the authors further suggested that qubit commitment is not possible. Here we show that this connection does not hold in general.