  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.
