Work

Honest-binding quantum bit commitment from separable operations

Year: 2026

Type: article

Abstract: Bit commitment is a fundamental cryptographic primitive and a cornerstone for numerous two-party cryptographic protocols, including zero-knowledge proofs. However, it has been proven that unconditionally secure bit commitment, both classical and quantum, is impossible. In this work, we demonstrate that imposing a restriction on the committing party to perform only separable operations enables secure quantum bit-commitment schemes. Specifically, we prove that in any perfectly hiding bit-commitment protocol, an honestly committing party limited to separable operations will be detected with high probability if they attempt to alter their commitment. To illustrate our findings, we present an example protocol.

Source: Physical Review A

DOI: 10.1103/58t8-dj5y

Authors: Ziad Chaoui, Anna Pappa, Matteo Rosati

Institutions: Technische Universität Berlin, Roma Tre University

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,675

Funders: Deutsche Forschungsgemeinschaft, Ministero dell'Università e della Ricerca