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Photon pair entangled in high dimensional orbital angular momentum (OAM)degree of freedom (DOF) has been widely regarded as a possible source inimproving the capacity of quantum information processing. The need for thegeneration of a high dimensional maximally entangled state in the OAM DOF istherefore much desired. In this work, we demonstrate a simple method togenerate a broader and flatter OAM spectrum, i.e. a larger spiral bandwidth(SB), of entangled photon pairs generated through spontaneous parametricdown-conversion by modifying the pump beam profile. By investigating bothexperimentally and theoretically, we have found that an exponential pumpprofile that is roughly the inverse of the mode profiles of the single-modefibers used for OAM detection will provide a much larger SB when compared to aGaussian shaped pump.

Increasing two-photon entangled dimensions by shaping input beam profiles