Unconditionally Secure Quantum Bit Commitment Using Neutron Double-Slit Interference

TL;DR

This paper proposes a quantum bit commitment scheme using neutron double-slit interference, exploiting the time evolution of quantum states to achieve security beyond traditional no-go theorems.

Contribution

It introduces a novel quantum bit commitment protocol that leverages the time development of non-stationary states, bypassing the limitations of existing no-go theorems.

Findings

The scheme is unconditionally secure against known attacks.

Time evolution of quantum states is essential for the scheme's security.

Using neutrons and non-stationary states enables secure quantum bit commitment.

Abstract

Using a neutron double-slit setup, we construct a quantum bit commitment scheme in which time development of quantum states plays an essential role. Our scheme evades the widely accepted no-go theorem by the fact that it is neither possible to stop the time evolution of spreading wave packets, nor is it possible to evolve them backward in time. Moreover, for unstable particles such as neutrons, one cannot delay detecting their positions indefinitely, or they would disintegrate spontaneously and escape detection. We find that using non-stationary states instead of stationary ones, unconditionally secure quantum bit commitment is possible.