Quantum bit commitment using Wheeler's delayed choice experiment

TL;DR

This paper proposes a quantum bit commitment protocol based on Wheeler's delayed choice experiment, leveraging the properties of photon behavior in a double-slit setup to ensure security and prevent indefinite delays.

Contribution

It introduces a novel quantum bit commitment scheme utilizing a double-slit experiment, combining quantum mechanics principles with delayed choice to enhance security.

Findings

The scheme prevents indefinite delay in commitment due to photon wavefront expansion.

It demonstrates a practical implementation of quantum bit commitment using optical setups.

The protocol leverages fundamental quantum properties to secure the commitment process.

Abstract

We construct a quantum bit commitment scheme using a double-slit setup similar to Wheeler's delayed choice experiment. Bob sends photons toward the double-slit, and Alice commits by determining either the slit from which each photon emerges (for $b=0$), or its landing position on a screen (for $b=1$). Since the photon's wave front expands at the speed of light, Alice cannot delay the detection indefinitely, or it would very soon be out of her control no matter how much resources she has.