On the scalability of parametric down-conversion for generating higher-order Fock states

Abstract

Spontaneous parametric down-conversion (SPDC) is the most widely-used method to generate higher-order Fock states ($n\ge 2$). Yet, a consistent performance analysis from fundamental principles is missing. Here we address this problem by introducing a framework for state fidelity and generation probability under the consideration of losses and multimode emission. With this analysis we show the fundamental limitations of this process as well as a trade-off between state fidelity and generation rate intrinsic to the probabilistic nature of the process. This identifies the parameter space for which SPDC is useful when generating higher-order Fock states for quantum applications. We experimentally investigate the strong pump regime of SPDC and demonstrate heralded Fock states up to $|n⟩=4$.

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