Producing Multiple Qubits via Spontaneous Parametric Down-Conversion
Phillip Heitert, Finn Buldt, Pascal Bassène, Moussa Ibra Ngom · Physical Review Applied · 2021
We present a simple approach to produce multiple correlated photon pairs through spontaneous parametric down-conversion. We develop Gaussian masks to subdivide the pump beam before passing it through a nonlinear medium. In this way, we are able to observe simultaneous separate down-converted emission cones with spatial overlap. The technique we employ could be used to greatly increase the dimensionality of entangled photonic systems generated from spontaneous parametric down-conversion, affording greater scalability to optical quantum computing than previously explored.