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We present an implementation of photonic qubit precertification that performsthe delicate task of detecting the presence of a flying photon withoutdestroying its qubit state, allowing loss-sensitive quantum cryptography andtests of nonlocality even over long distance. By splitting an incoming singlephoton in two via parametric down-conversion, we herald the photon's arrivalfrom an independent photon source while preserving its quantum information withup to $92.3\pm0.6$ % fidelity. With reduced detector dark counts,precertification will be immediately useful in quantum communication.

Certifying the presence of a photonic qubit by splitting it in two