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We study the use of detection devices in entanglement-based statepreparation. In particular we consider optical detection devices such assingle-photon sensitivity detectors, single-photon resolution detectors anddetector cascades (with an emphasis on the performance of realistic detectors).We develop an extensive theory for the use of these devices. Inentanglement-based state preparation we perform measurements on subsystems, andwe therefore need precise bounds on the distinguishability of thesemeasurements (this is fundamentally different from, e.g., tomography, where anensemble of identical states is used to determine probability distributions,etc.). To this end, we introduce the confidence of preparation, which may alsobe used to quantify the performance of detection devices in entanglement-basedpreparation. We give a general expression for detector cascades of arbitrarysize for the detection up to two photons. We show that, contrary to the generalbelief, cascading does not give a practical advantage over detectors withsingle-photon resolution in entanglement-based state preparation.Comment: 8 pages, 4 figures REVTe

Detection devices in entanglement-based optical state preparation