Information Carried by a Single Particle in Quantum Multiple-Access Channels

TL;DR

This paper demonstrates that quantum single particles can transmit more information than classical particles in multi-party communication, with theoretical bounds and experimental validation showing a quantum advantage.

Contribution

It provides the first theoretical bounds and experimental evidence for quantum advantage in single-particle multi-party communication channels.

Findings

Quantum bounds show a strict separation from classical limits.

Experimental implementation confirms quantum advantage with a rate sum exceeding classical bounds.

Achieved a rate sum of approximately 1.015 bits with a quantum particle.

Abstract

Non-classical features of quantum systems have the potential to strengthen the way we currently exchange information. In this paper, we explore this enhancement on the most basic level of single particles. To be more precise, we compare how well multi-party information can be transmitted to a single receiver using just one classical or quantum particle. Our approach is based on a multiple-access communication model in which messages can be encoded into a single particle that is coherently distributed across multiple spatial modes. Theoretically, we derive lower bounds on the accessible information in the quantum setting that strictly separate it from the classical scenario. This separation is found whenever there is more than one sender, and also when there is just a single sender who has a shared phase reference with the receiver. Experimentally, we demonstrate such quantum advantage in single-particle communication by implementing a multi-port interferometer with messages being encoded along the different trajectories. Specifically, we consider a two-sender communication protocol built by a three-port optical interferometer. In this scenario, the rate sum achievable with a classical particle is upper bounded by one bit, while we experimentally observe a rate sum of $1.0152\pm0.0034$ bits in the quantum setup.