Practically secure quantum bit commitment based on quantum seals

TL;DR

This paper explores the connection between quantum seals and quantum bit commitment, demonstrating that stronger quantum seal protocols can enable unconditionally secure quantum bit commitment, and proposes a practical secure protocol.

Contribution

It establishes that quantum seals are strictly stronger than quantum bit commitment in security and introduces a feasible, secure QBC protocol based on quantum seals.

Findings

Quantum seals are stronger than QBC in security requirements.

A practical QBC protocol based on quantum seals is proposed.

The protocol remains secure even against powerful quantum adversaries.

Abstract

The relationship between the quantum bit commitment (QBC) and quantum seal (QS) is studied. It is elaborated that QBC and QS are not equivalent, but QS protocols satisfying a stronger unconditional security requirement can lead to an unconditionally secure QBC. In this sense, QS is strictly stronger than QBC in security requirements. Based on an earlier proposal on sealing a single bit, a feasible QBC protocol is also put forward, which is secure in practice even if the cheater has a strong quantum computational power.