Piggybacking on Quantum Streams

TL;DR

This paper demonstrates a method to embed classical information into quantum streams protected by error correction, enabling information transfer without extra quantum resources or disturbance to the quantum data.

Contribution

It introduces a novel piggybacking technique that uses controlled syndromes and classical error correction to embed classical data into quantum streams.

Findings

Classical information can be added at arbitrary times without extra quantum resources.

The method maintains quantum stream integrity while embedding classical data.

Protection of syndromes enhances robustness against quantum noise.

Abstract

This paper shows that it is possible to piggyback classical information on a stream of qubits protected by quantum error correcting codes. The piggyback channel can be created by introducing intentional errors corresponding to a controlled sequence of syndromes. These syndromes are further protected, when quantum noise is present, by classical error correcting codes according to a performance-delay trade-off. Classical information can thus be added and extracted at arbitrary epochs without consuming additional quantum resources and without disturbing the quantum stream.