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Single-photons play an important role in emerging quantum technologies and information processing. An efficient generation technique consists in preparing such states via a conditional measurement on photon-number correlated beams: the detection of a single-photon on one of the beam can herald the generation of a single-photon state on the other one. Such scheme strongly depends on the heralding detector...
We show that photon quantum correlations can be measured by two photon absorption in semiconductors. Hanbury-Brown Twiss experiments can thus be performed with genuine blackbodies with a time resolution in the femtosecond range.
The second-order coherence properties of highly-incoherent cw sources (true blackbody and amplified spontaneous emission) are directly evidenced at femtosecond timescales by use of an interferometric autocorrelator based on a two-photon absorption in a GaAs phototube.
In order to accurately describe optical images, the quantum nature of light must be taken into account, even when the image is formed of a great number of photons. On the one hand, the inevitable quantum fluctuations of light degrade the quality of the image, but on the other hand, the possibility of creating strong quantum correlations or even entanglement between the different points open new possibilities...
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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