Quantum entanglement with acousto-optic modulators: 2-photon beatings and Bell experiments with moving beamsplitters
Andre Stefanov, Hugo Zbinden, Antoine Suarez, Nicolas Gisin
Abstract
We present an experiment testing quantum correlations with frequency shifted photons. We test Bell inequality with 2-photon interferometry where we replace the beamsplitters by acousto-optic modulators, which are equivalent to moving beamsplitters. We measure the 2-photon beatings induced by the frequency shifts, and we propose a cryptographic scheme in relation. Finally, setting the experiment in a relativistic configuration, we demonstrate that the quantum correlations are not only independent of the distance but also of the time ordering between the two single-photon measurements.
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