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We show that an optical vortex beam, implemented classically, can betransferred to the transverse amplitude of a heralded single photon. For thispurpose we have relied on the process of spontaneous parametric downconversion(SPDC) for the generation of signal and idler photon pairs, using a pump in theform of a Bessel-Gauss (BG) beam with orbital angular momentum (specifically,with topological charge l = 1 and l = 2). We have designed our source so thatit operates within the short SPDC crystal regime for which, the amplitude andphase of the pump may be transferred to a heralded single photon. In order toverify the vortex nature of our heralded single photon, we have shown that theconditional angular spectrum and the transverse intensity at the single-photonlevel match similar measurements carried out for the pump. In addition, we haveshown that when our heralded single photon is diffracted through a triangularaperture, the far-field singlephoton transverse intensity exhibits the expectedtriangular arrangement of intensity lobes associated with the presence oforbital angular momentum.

Classical to quantum transfer of optical vortices