  Quantum Reservoir Computing (QRC) exploits the information processing
capabilities of quantum systems to solve non-trivial temporal tasks, improving
over their classical counterparts. Recent progress has shown the potential of
QRC exploiting the enlarged Hilbert space, but real-time processing and the
achievement of a quantum advantage with efficient use of resources are
prominent challenges towards viable experimental realizations. In this work, we
propose a photonic platform suitable for real-time QRC based on a physical
ensemble of reservoirs in the form of identical optical pulses recirculating
through a closed loop. While ideal operation achieves maximum capacities,
statistical noise is shown to undermine a quantum advantage. We propose a
strategy to overcome this limitation and sustain the QRC performance when the
size of the system is scaled up. The platform is conceived for experimental
implementations to be viable with current technology.

Quantum Physics;Optics