Amplification of cascaded downconversion by reusing photons with a switchable cavity

Abstract

The ability to efficiently produce and manipulate nonclassical states of light is a critical requirement for the development of quantum optical technologies. In recent years, experiments have demonstrated that cascaded spontaneous parametric down-conversion is a promising approach to implement photon precertification, providing a way to overcome photon transmission losses for quantum communication, as well as to directly produce entangled three-photon states and heralded Bell pairs. However, the low efficiency of this process has so far limited its applicability beyond basic experiments. Here, we propose a scheme to amplify triplet production rates by using a fast switch and a delay loop to reuse photons that fail to convert on the first pass through the cascade's second nonlinear crystal. We construct a theoretical model to predict amplification rates and verify them in an experimental implementation. Our proof-of-concept device increases the rate of detected photon triplets as predicted, demonstrating that the method has the potential to dramatically improve the usefulness of cascaded down-conversion for device-independent quantum communication and entangled state generation.

6 pages, 5 figures

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Cited by in corpus (4)

• Experimental storage of photonic polarization entanglement in a broadband loop-based quantum memory
• Conservation of angular momentum on a single-photon level
• Long-distance entanglement sharing using hybrid states of discrete and continuous variables
• Photon triplets from integrated microrings: A path towards deterministic non-Gaussianity on a chip