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We realize image amplification in the continuous wave regime within an optical parametric oscillator bellow threshold. We show that its noise figure is better than that of a classical amplifier, demonstrating its quantum multimode operation.
We introduce a new device based on self-phase locking inside an optical parametric oscillator containing two crystals. The device generates directly frequency-tunable polarization entangled beams.
The problem of extracting a given piece of information from an image with the maximum sensitivity is solved in the general case. Implementations using image intensity processing techniques and homodyne measurements are given.
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