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Updated: May 23, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Experimental observation of impossible-to-beat quantum advantage on a hybrid photonic system
Eleonora Nagali1, Vincenzo D'Ambrosio, Fabio Sciarrino
1Dipartimento di Fisica della Sapienza Università di Roma, Roma 00185, Italy.
Abstract:
Quantum resources outperform classical ones for certain communication and computational tasks. Remarkably, in some cases, the quantum advantage cannot be improved using hypothetical postquantum resources. A class of tasks with this property can be singled out using graph theory. Here we report the experimental observation of an impossible-to-beat quantum advantage on a four-dimensional quantum system defined by the polarization and orbital angular momentum of a single photon. The results show pristine evidence of the quantum advantage and are compatible with the maximum advantage allowed using postquantum resources.
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