Certifying the Presence of a Photonic Qubit by Splitting It in Two
Certifying the Presence of a Photonic Qubit by Splitting It in Two
We present an implementation of photonic qubit precertification that performs the delicate task of detecting the presence of a flying photon without destroying its qubit state, allowing loss-sensitive quantum cryptography and tests of nonlocality even over long distance. By splitting an incoming single photon in two via parametric down-conversion, we …