We demonstrate a continuous-variable version of the quantum approximate optimization algorithm on a programmable single-mode photonic quantum computer, minimizing one-variable continuous functions. The results highlight the potential of continuous-variable quantum computing in near-term applications.

A novel all-optical feedforward automatic gain control scheme for pump power shared erbium-doped fiber amplifiers has been proposed. Dynamic gain excursion characteristics of the amplifier using the scheme have been experimentally clarified. The maximum absolute value of the gain excursion has been significantly reduced from 7.3 dB without control to 0.47 dB with the control scheme.

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A novel all-optical feedback automatic gain control scheme for remote optically pumped amplifiers has been proposed. The static and dynamic gain control characteristics of the remotely pumped erbium-doped fiber amplifier have been experimentally clarified. The maximum gain excursion has been successfully reduced by a factor of ∼10 from 2.1 dB to ∼0.2 dB using the proposed gain control scheme.