Location-Oblivious Data Transfer with Flying Entangled Qudits

TL;DR

This paper introduces a quantum protocol enabling two mistrustful parties to transfer data at a spacetime location unknown in advance, leveraging relativistic quantum principles for secure and location-oblivious data transfer.

Contribution

The paper proposes a novel relativistic quantum protocol for location-oblivious data transfer, expanding cryptographic applications beyond traditional non-relativistic methods.

Findings

Protocol guarantees data transfer at a random, unpredictable location.

Ensures Bob learns data location, but Alice cannot determine it.

Demonstrates a new cryptographic task unique to relativistic quantum theory.

Abstract

We present a simple and practical quantum protocol involving two mistrustful agencies in Minkowski space, which allows Alice to transfer data to Bob at a spacetime location that neither can predict in advance. The location depends on both Alice's and Bob's actions. The protocol guarantees unconditionally to Alice that Bob learns the data at a randomly determined location; it guarantees to Bob that Alice will not learn the transfer location even after the protocol is complete. The task implemented, transferring data at a space-time location that remains hidden from the transferrer, has no precise analogue in non-relativistic quantum cryptography. It illustrates further the scope for novel cryptographic applications of relativistic quantum theory.