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Limits on the deterministic creation of pure single-photon states using parametric down-conversion

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Christ,  Andreas
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Silberhorn,  Christine
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Christ, A., & Silberhorn, C. (2012). Limits on the deterministic creation of pure single-photon states using parametric down-conversion. PHYSICAL REVIEW A, 85(2): 023829. doi:10.1103/PhysRevA.85.023829.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-68F7-A
Abstract
Parametric down-conversion (PDC) is one of the most widely used methods to create pure single-photon states for quantum information applications. However, little attention has been paid to higher-order photon components in the PDC process, yet these ultimately limit the prospects of generating single photons of high quality. In this paper we investigate the impact of higher-order photon components and multiple frequency modes on the heralding rates and single-photon fidelities. This enables us to determine the limits of PDC sources for single-photon generation. Our results show that a perfectly single-mode PDC source in conjunction with a photon-number-resolving detector is ultimately capable of creating single-photon Fock states with unit fidelity and a maximal state creation probability of 25%. Hence, an array of 17 switched sources is required to build a deterministic (>99% emission probability) pure single-photon source.