No-masking does not imply no commitment

Abstract

The no-masking theorem claims that arbitrary quantum states cannot be masked. Based on this result, it was further claimed that qubit commitment is impossible. However, here we show that arbitrary known quantum states can be masked. Meanwhile, the states in qubit commitment is always known. Consequently, the no-masking theorem cannot lead to no qubit commitment.

Keywords

• Quantum masking
• Qubit commitment
• No-go theorem
• Quantum cryptography