Transmitting Correlation for Data Transmission over the Bosonic Arbitrarily Varying Channel

TL;DR

This paper explores how optical communication systems can use correlated or entangled light to distribute shared randomness, helping to stabilize against jamming in arbitrarily varying channels with power constraints.

Contribution

It demonstrates a method for distributing shared randomness using thermal or entangled light in optical channels, addressing the challenge of jamming without external sources.

Findings

Thermal light and entangled states can be used to distribute shared randomness.

Homodyne detection suffices for the proposed scheme.

The method is effective under energy constraints.

Abstract

Shared randomness is the central ingredient for stabilizing symmetrizable communication systems against arbitrarily varying jammers. Given the presence of the jammer, however, the question arises how this precious resource could have been distributed. Several works discuss the use of external sources for this task. In this work, we show, based on the most standard optical communication model, how the sender and receiver can employ either classically correlated thermal light or entangled two-mode squeezed states created at and transmitted by the sender to counter the jamming attack of an energy-limited jammer during the distribution phase. Both sender and receiver are only allowed to use homodyne detection in our model, and the sender has to obey a power limit as well.